Pull x86 entry cleanup from Ingo Molnar:
"A single commit that removes a redundant complication from
preempt-schedule handling in the x86 entry code"
* 'x86-entry-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/entry: Remove unneeded need_resched() loop
Pull x86 cpu updates from Ingo Molnar:
"Two changes: a Hygon CPU fix, and an optimization Centaur CPUs"
* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/power: Optimize C3 entry on Centaur CPUs
x86/CPU/hygon: Fix phys_proc_id calculation logic for multi-die processors
Pull x86 cleanups from Ingo Molnar:
"A handful of cleanups: dma-ops cleanups, missing boot time kcalloc()
check, a Sparse fix and use struct_size() to simplify a vzalloc()
call"
* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/pci: Clean up usage of X86_DEV_DMA_OPS
x86/Kconfig: Remove the unused X86_DMA_REMAP KConfig symbol
x86/kexec/crash: Use struct_size() in vzalloc()
x86/mm/tlb: Define LOADED_MM_SWITCHING with pointer-sized number
x86/platform/uv: Fix missing checks of kcalloc() return values
Pull x86 cache QoS updates from Ingo Molnar:
"An RDT cleanup and a fix for RDT initialization of new resource
groups"
* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/resctrl: Initialize a new resource group with default MBA values
x86/resctrl: Move per RDT domain initialization to a separate function
Pull x86 build updates from Ingo Molnar:
"Misc updates:
- Add link flag quirk to solve LLVM linker bug that removes local
relocations, causing KASLR boot failures.
- Update the defconfigs to remove archaic partition table support
- Fix kernel growing pains: we had a bug in relocs.c handling section
header table entries count larger than 0xff00 (~65k), which can
happen with the -ffunction-sections flag, causing a build failure
with a cryptic error message. Add support for detecting the limit
and using the ELF protocol that extends the sections table via
->sh_size. The new limit is now much larger - over a billion
entries?"
* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tools/relocs: Fix big section header tables
x86/defconfig: Remove archaic partition tables support
x86/build: Keep local relocations with ld.lld
Pull x86 asm updates from Ingo Molnar:
"This includes the following changes:
- cpu_has() cleanups
- sync_bitops.h modernization to the rmwcc.h facility, similarly to
bitops.h
- continued LTO annotations/fixes
- misc cleanups and smaller cleanups"
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/um/vdso: Drop unnecessary cc-ldoption
x86/vdso: Rename variable to fix -Wshadow warning
x86/cpu/amd: Exclude 32bit only assembler from 64bit build
x86/asm: Mark all top level asm statements as .text
x86/build/vdso: Add FORCE to the build rule of %.so
x86/asm: Modernize sync_bitops.h
x86/mm: Convert some slow-path static_cpu_has() callers to boot_cpu_has()
x86: Convert some slow-path static_cpu_has() callers to boot_cpu_has()
x86/asm: Clarify static_cpu_has()'s intended use
x86/uaccess: Fix implicit cast of __user pointer
x86/cpufeature: Remove __pure attribute to _static_cpu_has()
Pull x86 apic update from Ingo Molnar:
"A single commit which unifies the unnecessarily diverged
implementations of APIC timer initialization. As a result the
max_delta parameter is now consistently taken into account"
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/apic: Unify duplicated local apic timer clockevent initialization
Pull timer updates from Ingo Molnar:
"This cycle had the following changes:
- Timer tracing improvements (Anna-Maria Gleixner)
- Continued tasklet reduction work: remove the hrtimer_tasklet
(Thomas Gleixner)
- Fix CPU hotplug remove race in the tick-broadcast mask handling
code (Thomas Gleixner)
- Force upper bound for setting CLOCK_REALTIME, to fix ABI
inconsistencies with handling values that are close to the maximum
supported and the vagueness of when uptime related wraparound might
occur. Make the consistent maximum the year 2232 across all
relevant ABIs and APIs. (Thomas Gleixner)
- various cleanups and smaller fixes"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tick: Fix typos in comments
tick/broadcast: Fix warning about undefined tick_broadcast_oneshot_offline()
timekeeping: Force upper bound for setting CLOCK_REALTIME
timer/trace: Improve timer tracing
timer/trace: Replace deprecated vsprintf pointer extension %pf by %ps
timer: Move trace point to get proper index
tick/sched: Update tick_sched struct documentation
tick: Remove outgoing CPU from broadcast masks
timekeeping: Consistently use unsigned int for seqcount snapshot
softirq: Remove tasklet_hrtimer
xfrm: Replace hrtimer tasklet with softirq hrtimer
mac80211_hwsim: Replace hrtimer tasklet with softirq hrtimer
Pull CPU hotplug updates from Ingo Molnar:
"Two changes in this cycle:
- Make the /sys/devices/system/cpu/smt/* files available on all
arches, so user space has a consistent way to detect whether SMT is
enabled.
- Sparse annotation fix"
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
smpboot: Place the __percpu annotation correctly
cpu/hotplug: Create SMT sysfs interface for all arches
Pull scheduler updates from Ingo Molnar:
"The main changes in this cycle were:
- Make nohz housekeeping processing more permissive and less
intrusive to isolated CPUs
- Decouple CPU-bound workqueue acconting from the scheduler and move
it into the workqueue code.
- Optimize topology building
- Better handle quota and period overflows
- Add more RCU annotations
- Comment updates, misc cleanups"
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (25 commits)
nohz_full: Allow the boot CPU to be nohz_full
sched/isolation: Require a present CPU in housekeeping mask
kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec freeze
power/suspend: Add function to disable secondaries for suspend
sched/core: Allow the remote scheduler tick to be started on CPU0
sched/nohz: Run NOHZ idle load balancer on HK_FLAG_MISC CPUs
sched/debug: Fix spelling mistake "logaritmic" -> "logarithmic"
sched/topology: Update init_sched_domains() comment
cgroup/cpuset: Update stale generate_sched_domains() comments
sched/core: Check quota and period overflow at usec to nsec conversion
sched/core: Handle overflow in cpu_shares_write_u64
sched/rt: Check integer overflow at usec to nsec conversion
sched/core: Fix typo in comment
sched/core: Make some functions static
sched/core: Unify p->on_rq updates
sched/core: Remove ttwu_activate()
sched/core, workqueues: Distangle worker accounting from rq lock
sched/fair: Remove unneeded prototype of capacity_of()
sched/topology: Skip duplicate group rewrites in build_sched_groups()
sched/topology: Fix build_sched_groups() comment
...
Pull perf updates from Ingo Molnar:
"The main kernel changes were:
- add support for Intel's "adaptive PEBS v4" - which embedds LBS data
in PEBS records and can thus batch up and reduce the IRQ (NMI) rate
significantly - reducing overhead and making call-graph profiling
less intrusive.
- add Intel CPU core and uncore support updates for Tremont, Icelake,
- extend the x86 PMU constraints scheduler with 'constraint ranges'
to better support Icelake hw constraints,
- make x86 call-chain support work better with CONFIG_FRAME_POINTER=y
- misc other changes
Tooling changes:
- updates to the main tools: 'perf record', 'perf trace', 'perf
stat'
- updated Intel and S/390 vendor events
- libtraceevent updates
- misc other updates and fixes"
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (69 commits)
perf/x86: Make perf callchains work without CONFIG_FRAME_POINTER
watchdog: Fix typo in comment
perf/x86/intel: Add Tremont core PMU support
perf/x86/intel/uncore: Add Intel Icelake uncore support
perf/x86/msr: Add Icelake support
perf/x86/intel/rapl: Add Icelake support
perf/x86/intel/cstate: Add Icelake support
perf/x86/intel: Add Icelake support
perf/x86: Support constraint ranges
perf/x86/lbr: Avoid reading the LBRs when adaptive PEBS handles them
perf/x86/intel: Support adaptive PEBS v4
perf/x86/intel/ds: Extract code of event update in short period
perf/x86/intel: Extract memory code PEBS parser for reuse
perf/x86: Support outputting XMM registers
perf/x86/intel: Force resched when TFA sysctl is modified
perf/core: Add perf_pmu_resched() as global function
perf/headers: Fix stale comment for struct perf_addr_filter
perf/core: Make perf_swevent_init_cpu() static
perf/x86: Add sanity checks to x86_schedule_events()
perf/x86: Optimize x86_schedule_events()
...
Pull locking updates from Ingo Molnar:
"Here are the locking changes in this cycle:
- rwsem unification and simpler micro-optimizations to prepare for
more intrusive (and more lucrative) scalability improvements in
v5.3 (Waiman Long)
- Lockdep irq state tracking flag usage cleanups (Frederic
Weisbecker)
- static key improvements (Jakub Kicinski, Peter Zijlstra)
- misc updates, cleanups and smaller fixes"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
locking/lockdep: Remove unnecessary unlikely()
locking/static_key: Don't take sleeping locks in __static_key_slow_dec_deferred()
locking/static_key: Factor out the fast path of static_key_slow_dec()
locking/static_key: Add support for deferred static branches
locking/lockdep: Test all incompatible scenarios at once in check_irq_usage()
locking/lockdep: Avoid bogus Clang warning
locking/lockdep: Generate LOCKF_ bit composites
locking/lockdep: Use expanded masks on find_usage_*() functions
locking/lockdep: Map remaining magic numbers to lock usage mask names
locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING
locking/rwsem: Prevent unneeded warning during locking selftest
locking/rwsem: Optimize rwsem structure for uncontended lock acquisition
locking/rwsem: Enable lock event counting
locking/lock_events: Don't show pvqspinlock events on bare metal
locking/lock_events: Make lock_events available for all archs & other locks
locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs
locking/rwsem: Enhance DEBUG_RWSEMS_WARN_ON() macro
locking/rwsem: Add debug check for __down_read*()
locking/rwsem: Micro-optimize rwsem_try_read_lock_unqueued()
locking/rwsem: Move rwsem internal function declarations to rwsem-xadd.h
...
Pull irq updates from Ingo Molnar:
"The changes in this cycle were:
- Remove the irq timings/variance statistics code that tried to
predict when the next interrupt would occur, which didn't work out
as hoped and is replaced by another mechanism.
- This new mechanism is the 'array suffix computation' estimate,
which is superior to the previous one as it can detect not just a
single periodic pattern, but independent periodic patterns along a
log-2 scale of bucketing and exponential moving average. The
comments are longer than the code - and it works better at
predicting various complex interrupt patterns from real-world
devices than the previous estimate.
- avoid IRQ-work self-IPIs on the local CPU
- fix work-list corruption in irq_set_affinity_notifier()"
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irq_work: Do not raise an IPI when queueing work on the local CPU
genirq/devres: Use struct_size() in devm_kzalloc()
genirq/timings: Add array suffix computation code
genirq/timings: Remove variance computation code
genirq: Prevent use-after-free and work list corruption
Pull EFI updates from Ingo Molnar:
"The changes in this cycle were:
- Squash a spurious warning when using the EFI framebuffer on a
non-EFI boot
- Use DMI data to annotate RAS memory errors on ARM just like we do
on Intel
- Followup cleanups for DMI
- libstub Makefile cleanups"
* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/libstub/arm: Omit unneeded stripping of ksymtab/kcrctab sections
efi: Unify DMI setup code over the arm/arm64, ia64 and x86 architectures
efi/arm: Show SMBIOS bank/device location in CPER and GHES error logs
efifb: Omit memory map check on legacy boot
efi/libstub: Refactor the cmd_stubcopy Makefile command
Pull stack trace updates from Ingo Molnar:
"So Thomas looked at the stacktrace code recently and noticed a few
weirdnesses, and we all know how such stories of crummy kernel code
meeting German engineering perfection end: a 45-patch series to clean
it all up! :-)
Here's the changes in Thomas's words:
'Struct stack_trace is a sinkhole for input and output parameters
which is largely pointless for most usage sites. In fact if embedded
into other data structures it creates indirections and extra storage
overhead for no benefit.
Looking at all usage sites makes it clear that they just require an
interface which is based on a storage array. That array is either on
stack, global or embedded into some other data structure.
Some of the stack depot usage sites are outright wrong, but
fortunately the wrongness just causes more stack being used for
nothing and does not have functional impact.
Another oddity is the inconsistent termination of the stack trace
with ULONG_MAX. It's pointless as the number of entries is what
determines the length of the stored trace. In fact quite some call
sites remove the ULONG_MAX marker afterwards with or without nasty
comments about it. Not all architectures do that and those which do,
do it inconsistenly either conditional on nr_entries == 0 or
unconditionally.
The following series cleans that up by:
1) Removing the ULONG_MAX termination in the architecture code
2) Removing the ULONG_MAX fixups at the call sites
3) Providing plain storage array based interfaces for stacktrace
and stackdepot.
4) Cleaning up the mess at the callsites including some related
cleanups.
5) Removing the struct stack_trace based interfaces
This is not changing the struct stack_trace interfaces at the
architecture level, but it removes the exposure to the generic
code'"
* 'core-stacktrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (45 commits)
x86/stacktrace: Use common infrastructure
stacktrace: Provide common infrastructure
lib/stackdepot: Remove obsolete functions
stacktrace: Remove obsolete functions
livepatch: Simplify stack trace retrieval
tracing: Remove the last struct stack_trace usage
tracing: Simplify stack trace retrieval
tracing: Make ftrace_trace_userstack() static and conditional
tracing: Use percpu stack trace buffer more intelligently
tracing: Simplify stacktrace retrieval in histograms
lockdep: Simplify stack trace handling
lockdep: Remove save argument from check_prev_add()
lockdep: Remove unused trace argument from print_circular_bug()
drm: Simplify stacktrace handling
dm persistent data: Simplify stack trace handling
dm bufio: Simplify stack trace retrieval
btrfs: ref-verify: Simplify stack trace retrieval
dma/debug: Simplify stracktrace retrieval
fault-inject: Simplify stacktrace retrieval
mm/page_owner: Simplify stack trace handling
...
Pull speculation mitigation update from Ingo Molnar:
"This adds the "mitigations=" bootline option, which offers a
cross-arch set of options that will work on x86, PowerPC and s390 that
will map to the arch specific option internally"
* 'core-speculation-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
s390/speculation: Support 'mitigations=' cmdline option
powerpc/speculation: Support 'mitigations=' cmdline option
x86/speculation: Support 'mitigations=' cmdline option
cpu/speculation: Add 'mitigations=' cmdline option
Pull rseq updates from Ingo Molnar:
"A cleanup and a fix to comments"
* 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rseq: Remove superfluous rseq_len from task_struct
rseq: Clean up comments by reflecting removal of event counter
Pull objtool updates from Ingo Molnar:
"This is a series from Peter Zijlstra that adds x86 build-time uaccess
validation of SMAP to objtool, which will detect and warn about the
following uaccess API usage bugs and weirdnesses:
- call to %s() with UACCESS enabled
- return with UACCESS enabled
- return with UACCESS disabled from a UACCESS-safe function
- recursive UACCESS enable
- redundant UACCESS disable
- UACCESS-safe disables UACCESS
As it turns out not leaking uaccess permissions outside the intended
uaccess functionality is hard when the interfaces are complex and when
such bugs are mostly dormant.
As a bonus we now also check the DF flag. We had at least one
high-profile bug in that area in the early days of Linux, and the
checking is fairly simple. The checks performed and warnings emitted
are:
- call to %s() with DF set
- return with DF set
- return with modified stack frame
- recursive STD
- redundant CLD
It's all x86-only for now, but later on this can also be used for PAN
on ARM and objtool is fairly cross-platform in principle.
While all warnings emitted by this new checking facility that got
reported to us were fixed, there might be GCC version dependent
warnings that were not reported yet - which we'll address, should they
trigger.
The warnings are non-fatal build warnings"
* 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
x86/uaccess: Dont leak the AC flag into __put_user() argument evaluation
sched/x86_64: Don't save flags on context switch
objtool: Add Direction Flag validation
objtool: Add UACCESS validation
objtool: Fix sibling call detection
objtool: Rewrite alt->skip_orig
objtool: Add --backtrace support
objtool: Rewrite add_ignores()
objtool: Handle function aliases
objtool: Set insn->func for alternatives
x86/uaccess, kcov: Disable stack protector
x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP
x86/uaccess, ubsan: Fix UBSAN vs. SMAP
x86/uaccess, kasan: Fix KASAN vs SMAP
x86/smap: Ditch __stringify()
x86/uaccess: Introduce user_access_{save,restore}()
x86/uaccess, signal: Fix AC=1 bloat
x86/uaccess: Always inline user_access_begin()
x86/uaccess, xen: Suppress SMAP warnings
...
Pull unified TLB flushing from Ingo Molnar:
"This contains the generic mmu_gather feature from Peter Zijlstra,
which is an all-arch unification of TLB flushing APIs, via the
following (broad) steps:
- enhance the <asm-generic/tlb.h> APIs to cover more arch details
- convert most TLB flushing arch implementations to the generic
<asm-generic/tlb.h> APIs.
- remove leftovers of per arch implementations
After this series every single architecture makes use of the unified
TLB flushing APIs"
* 'core-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
mm/resource: Use resource_overlaps() to simplify region_intersects()
ia64/tlb: Eradicate tlb_migrate_finish() callback
asm-generic/tlb: Remove tlb_table_flush()
asm-generic/tlb: Remove tlb_flush_mmu_free()
asm-generic/tlb: Remove CONFIG_HAVE_GENERIC_MMU_GATHER
asm-generic/tlb: Remove arch_tlb*_mmu()
s390/tlb: Convert to generic mmu_gather
asm-generic/tlb: Introduce CONFIG_HAVE_MMU_GATHER_NO_GATHER=y
arch/tlb: Clean up simple architectures
um/tlb: Convert to generic mmu_gather
sh/tlb: Convert SH to generic mmu_gather
ia64/tlb: Convert to generic mmu_gather
arm/tlb: Convert to generic mmu_gather
asm-generic/tlb, arch: Invert CONFIG_HAVE_RCU_TABLE_INVALIDATE
asm-generic/tlb, ia64: Conditionally provide tlb_migrate_finish()
asm-generic/tlb: Provide generic tlb_flush() based on flush_tlb_mm()
asm-generic/tlb, arch: Provide generic tlb_flush() based on flush_tlb_range()
asm-generic/tlb, arch: Provide generic VIPT cache flush
asm-generic/tlb, arch: Provide CONFIG_HAVE_MMU_GATHER_PAGE_SIZE
asm-generic/tlb: Provide a comment
Make the forward declaration actually match the real function
definition, something that previous versions of gcc had just ignored.
This is another patch to fix new warnings from gcc-9 before I start the
merge window pulls. I don't want to miss legitimate new warnings just
because my system update brought a new compiler with new warnings.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The kernel the kernel is built with -Wvla for some time, so is not
supposed to have any variable length arrays. Remove vla bounds checking
from ubsan since it's useless now.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Building lib/ubsan.c with gcc-9 results in a ton of nasty warnings like
this one:
lib/ubsan.c warning: conflicting types for built-in function
‘__ubsan_handle_negate_overflow’; expected ‘void(void *, void *)’ [-Wbuiltin-declaration-mismatch]
The kernel's declarations of __ubsan_handle_*() often uses 'unsigned
long' types in parameters while GCC these parameters as 'void *' types,
hence the mismatch.
Fix this by using 'void *' to match GCC's declarations.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Fixes: c6d308534a ("UBSAN: run-time undefined behavior sanity checker")
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull perf fixes from Ingo Molnar:
"I'd like to apologize for this very late pull request: I was dithering
through the week whether to send the fixes, and then yesterday Jiri's
crash fix for a regression introduced in this cycle clearly marked
perf/urgent as 'must merge now'.
Most of the commits are tooling fixes, plus there's three kernel fixes
via four commits:
- race fix in the Intel PEBS code
- fix an AUX bug and roll back a previous attempt
- fix AMD family 17h generic HW cache-event perf counters
The largest diffstat contribution comes from the AMD fix - a new event
table is introduced, which is a fairly low risk change but has a large
linecount"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Fix race in intel_pmu_disable_event()
perf/x86/intel/pt: Remove software double buffering PMU capability
perf/ring_buffer: Fix AUX software double buffering
perf tools: Remove needless asm/unistd.h include fixing build in some places
tools arch uapi: Copy missing unistd.h headers for arc, hexagon and riscv
tools build: Add -ldl to the disassembler-four-args feature test
perf cs-etm: Always allocate memory for cs_etm_queue::prev_packet
perf cs-etm: Don't check cs_etm_queue::prev_packet validity
perf report: Report OOM in status line in the GTK UI
perf bench numa: Add define for RUSAGE_THREAD if not present
tools lib traceevent: Change tag string for error
perf annotate: Fix build on 32 bit for BPF annotation
tools uapi x86: Sync vmx.h with the kernel
perf bpf: Return value with unlocking in perf_env__find_btf()
MAINTAINERS: Include vendor specific files under arch/*/events/*
perf/x86/amd: Update generic hardware cache events for Family 17h
Pull scheduler fix from Ingo Molnar:
"Fix a kobject memory leak in the cpufreq code"
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/cpufreq: Fix kobject memleak
Pull x86 fix from Ingo Molnar:
"Disable function tracing during early SME setup to fix a boot crash on
SME-enabled kernels running distro kernels (some of which have
function tracing enabled)"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm/mem_encrypt: Disable all instrumentation for early SME setup
Pull vfs fixes from Al Viro:
- a couple of ->i_link use-after-free fixes
- regression fix for wrong errno on absent device name in mount(2)
(this cycle stuff)
- ancient UFS braino in large GID handling on Solaris UFS images (bogus
cut'n'paste from large UID handling; wrong field checked to decide
whether we should look at old (16bit) or new (32bit) field)
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ufs: fix braino in ufs_get_inode_gid() for solaris UFS flavour
Abort file_remove_privs() for non-reg. files
[fix] get rid of checking for absent device name in vfs_get_tree()
apparmorfs: fix use-after-free on symlink traversal
securityfs: fix use-after-free on symlink traversal
New race in x86_pmu_stop() was introduced by replacing the
atomic __test_and_clear_bit() of cpuc->active_mask by separate
test_bit() and __clear_bit() calls in the following commit:
3966c3feca ("x86/perf/amd: Remove need to check "running" bit in NMI handler")
The race causes panic for PEBS events with enabled callchains:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
...
RIP: 0010:perf_prepare_sample+0x8c/0x530
Call Trace:
<NMI>
perf_event_output_forward+0x2a/0x80
__perf_event_overflow+0x51/0xe0
handle_pmi_common+0x19e/0x240
intel_pmu_handle_irq+0xad/0x170
perf_event_nmi_handler+0x2e/0x50
nmi_handle+0x69/0x110
default_do_nmi+0x3e/0x100
do_nmi+0x11a/0x180
end_repeat_nmi+0x16/0x1a
RIP: 0010:native_write_msr+0x6/0x20
...
</NMI>
intel_pmu_disable_event+0x98/0xf0
x86_pmu_stop+0x6e/0xb0
x86_pmu_del+0x46/0x140
event_sched_out.isra.97+0x7e/0x160
...
The event is configured to make samples from PEBS drain code,
but when it's disabled, we'll go through NMI path instead,
where data->callchain will not get allocated and we'll crash:
x86_pmu_stop
test_bit(hwc->idx, cpuc->active_mask)
intel_pmu_disable_event(event)
{
...
intel_pmu_pebs_disable(event);
...
EVENT OVERFLOW -> <NMI>
intel_pmu_handle_irq
handle_pmi_common
TEST PASSES -> test_bit(bit, cpuc->active_mask))
perf_event_overflow
perf_prepare_sample
{
...
if (!(sample_type & __PERF_SAMPLE_CALLCHAIN_EARLY))
data->callchain = perf_callchain(event, regs);
CRASH -> size += data->callchain->nr;
}
</NMI>
...
x86_pmu_disable_event(event)
}
__clear_bit(hwc->idx, cpuc->active_mask);
Fixing this by disabling the event itself before setting
off the PEBS bit.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Arcari <darcari@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Lendacky Thomas <Thomas.Lendacky@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 3966c3feca ("x86/perf/amd: Remove need to check "running" bit in NMI handler")
Link: http://lkml.kernel.org/r/20190504151556.31031-1-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
One regression fix.
Changes we merged to STRICT_KERNEL_RWX on 32-bit were causing crashes under
load on some machines depending on memory layout.
Thanks to:
Christophe Leroy.
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Merge tag 'powerpc-5.1-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fix from Michael Ellerman:
"One regression fix.
Changes we merged to STRICT_KERNEL_RWX on 32-bit were causing crashes
under load on some machines depending on memory layout.
Thanks to Christophe Leroy"
* tag 'powerpc-5.1-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/32s: Fix BATs setting with CONFIG_STRICT_KERNEL_RWX
* Fix old Windows versions on AMD (recent regression)
* Fix old Linux versions on processors without EPT
* Fixes for LAPIC timer optimizations
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Paolo Bonzini:
- PPC and ARM bugfixes from submaintainers
- Fix old Windows versions on AMD (recent regression)
- Fix old Linux versions on processors without EPT
- Fixes for LAPIC timer optimizations
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
KVM: nVMX: Fix size checks in vmx_set_nested_state
KVM: selftests: make hyperv_cpuid test pass on AMD
KVM: lapic: Check for in-kernel LAPIC before deferencing apic pointer
KVM: fix KVM_CLEAR_DIRTY_LOG for memory slots of unaligned size
x86/kvm/mmu: reset MMU context when 32-bit guest switches PAE
KVM: x86: Whitelist port 0x7e for pre-incrementing %rip
Documentation: kvm: fix dirty log ioctl arch lists
KVM: VMX: Move RSB stuffing to before the first RET after VM-Exit
KVM: arm/arm64: Don't emulate virtual timers on userspace ioctls
kvm: arm: Skip stage2 huge mappings for unaligned ipa backed by THP
KVM: arm/arm64: Ensure vcpu target is unset on reset failure
KVM: lapic: Convert guest TSC to host time domain if necessary
KVM: lapic: Allow user to disable adaptive tuning of timer advancement
KVM: lapic: Track lapic timer advance per vCPU
KVM: lapic: Disable timer advancement if adaptive tuning goes haywire
x86: kvm: hyper-v: deal with buggy TLB flush requests from WS2012
KVM: x86: Consider LAPIC TSC-Deadline timer expired if deadline too short
KVM: PPC: Book3S: Protect memslots while validating user address
KVM: PPC: Book3S HV: Perserve PSSCR FAKE_SUSPEND bit on guest exit
KVM: arm/arm64: vgic-v3: Retire pending interrupts on disabling LPIs
...
Pull i2c fixes from Wolfram Sang:
"I2C driver bugfixes and a MAINTAINERS update for you"
* 'i2c/for-current-fixed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: Prevent runtime suspend of adapter when Host Notify is required
i2c: synquacer: fix enumeration of slave devices
MAINTAINERS: friendly takeover of i2c-gpio driver
i2c: designware: ratelimit 'transfer when suspended' errors
i2c: imx: correct the method of getting private data in notifier_call
Allow the boot CPU/CPU0 to be nohz_full. Have the boot CPU take the
do_timer duty during boot until a housekeeping CPU can take over.
This is supported when CONFIG_PM_SLEEP_SMP is not configured, or when
it is configured and the arch allows suspend on non-zero CPUs.
nohz_full has been trialed at a large supercomputer site and found to
significantly reduce jitter. In order to deploy it in production, they
need CPU0 to be nohz_full because their job control system requires
the application CPUs to start from 0, and the housekeeping CPUs are
placed higher. An equivalent job scheduling that uses CPU0 for
housekeeping could be achieved by modifying their system, but it is
preferable if nohz_full can support their environment without
modification.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-6-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
During housekeeping mask setup, currently a possible CPU is required.
That does not guarantee the CPU would be available at boot time, so
check to ensure that at least one present CPU is in the mask.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-5-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This patch provides an arch option, ARCH_SUSPEND_NONZERO_CPU, to
opt-in to allowing suspend to occur on one of the housekeeping CPUs
rather than hardcoded CPU0.
This will allow CPU0 to be a nohz_full CPU with a later change.
It may be possible for platforms with hardware/firmware restrictions
on suspend/wake effectively support this by handing off the final
stage to CPU0 when kernel housekeeping is no longer required. Another
option is to make housekeeping / nohz_full mask dynamic at runtime,
but the complexity could not be justified at this time.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-4-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This adds a function to disable secondary CPUs for suspend that are
not necessarily non-zero / non-boot CPUs. Platforms will be able to
use this to suspend using non-zero CPUs.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-3-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'drm-fixes-2019-05-03' of git://anongit.freedesktop.org/drm/drm
Pull drm fix from Dave Airlie:
"Just a single qxl revert"
* tag 'drm-fixes-2019-05-03' of git://anongit.freedesktop.org/drm/drm:
Revert "drm/qxl: drop prime import/export callbacks"
where we forgot to hold a lock while iterating a list that can change,
and finally a build fix that adds some stubs for clk APIs that are used
by devfreq drivers on platforms without the clk APIs.
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Merge tag 'clk-fixes-for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk fixes from Stephen Boyd:
"Two fixes for the NKMP clks on Allwinner SoCs, a locking fix for
clkdev where we forgot to hold a lock while iterating a list that can
change, and finally a build fix that adds some stubs for clk APIs that
are used by devfreq drivers on platforms without the clk APIs"
* tag 'clk-fixes-for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/clk/linux:
clk: Add missing stubs for a few functions
clkdev: Hold clocks_mutex while iterating clocks list
clk: sunxi-ng: nkmp: Explain why zero width check is needed
clk: sunxi-ng: nkmp: Avoid GENMASK(-1, 0)
A few stable fixes at this round.
The USB Line6 audio fixes are a bit large, but they are rather trivial
and pretty much device-specific, so should be safe to apply at this
late stage. Ditto for other HD-audio quirks.
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Merge tag 'sound-5.1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A few stable fixes at this round.
The USB Line6 audio fixes are a bit large, but they are rather trivial
and pretty much device-specific, so should be safe to apply at this
late stage. Ditto for other HD-audio quirks"
* tag 'sound-5.1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: hda/realtek - Apply the fixup for ASUS Q325UAR
ALSA: line6: use dynamic buffers
ALSA: hda/realtek - Fixed Dell AIO speaker noise
ALSA: hda/realtek - Add new Dell platform for headset mode
This has no effect yet because CPU0 will always be a housekeeping CPU
until a later change.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-2-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Now that all AUX allocations are high-order by default, the software
double buffering PMU capability doesn't make sense any more, get rid
of it. In case some PMUs choose to opt out, we can re-introduce it.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Link: http://lkml.kernel.org/r/20190503085536.24119-3-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This recent commit:
5768402fd9 ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")
overlooked the fact that the previous one page granularity of the AUX buffer
provided an implicit double buffering capability to the PMU driver, which
went away when the entire buffer became one high-order page.
Always make the full-trace mode AUX allocation at least two-part to preserve
the previous behavior and allow the implicit double buffering to continue.
Reported-by: Ammy Yi <ammy.yi@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Fixes: 5768402fd9 ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")
Link: http://lkml.kernel.org/r/20190503085536.24119-2-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
tools UAPI:
Arnaldo Carvalho de Melo:
- Sync x86's vmx.h with the kernel.
- Copy missing unistd.h headers for arc, hexagon and riscv, fixing
a reported build regression on the ARC 32-bit architecture.
perf bench numa:
Arnaldo Carvalho de Melo:
- Add define for RUSAGE_THREAD if not present, fixing the build on the
ARC architecture when only zlib and libnuma are present.
perf BPF:
Arnaldo Carvalho de Melo:
- The disassembler-four-args feature test needs -ldl on distros such as
Mageia 7.
Bo YU:
- Fix unlocking on success in perf_env__find_btf(), detected with
the coverity tool.
libtraceevent:
Leo Yan:
- Change misleading hard coded 'trace-cmd' string in error messages.
ARM hardware tracing:
Leo Yan:
- Always allocate memory for cs_etm_queue::prev_packet, fixing a segfault
when processing CoreSight perf data.
perf annotate:
Thadeu Lima de Souza Cascardo:
- Fix build on 32 bit for BPF.
perf report:
Thomas Richter:
- Report OOM in status line in the GTK UI.
core libs:
- Remove needless asm/unistd.h that, used with sys/syscall.h ended
up redefining the syscalls defines in environments such as the
ARC arch when using uClibc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-urgent-for-mingo-5.1-20190502' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/urgent fixes from Arnaldo Carvalho de Melo:
tools UAPI:
Arnaldo Carvalho de Melo:
- Sync x86's vmx.h with the kernel.
- Copy missing unistd.h headers for arc, hexagon and riscv, fixing
a reported build regression on the ARC 32-bit architecture.
perf bench numa:
Arnaldo Carvalho de Melo:
- Add define for RUSAGE_THREAD if not present, fixing the build on the
ARC architecture when only zlib and libnuma are present.
perf BPF:
Arnaldo Carvalho de Melo:
- The disassembler-four-args feature test needs -ldl on distros such as
Mageia 7.
Bo YU:
- Fix unlocking on success in perf_env__find_btf(), detected with
the coverity tool.
libtraceevent:
Leo Yan:
- Change misleading hard coded 'trace-cmd' string in error messages.
ARM hardware tracing:
Leo Yan:
- Always allocate memory for cs_etm_queue::prev_packet, fixing a segfault
when processing CoreSight perf data.
perf annotate:
Thadeu Lima de Souza Cascardo:
- Fix build on 32 bit for BPF.
perf report:
Thomas Richter:
- Report OOM in status line in the GTK UI.
core libs:
- Remove needless asm/unistd.h that, used with sys/syscall.h ended
up redefining the syscalls defines in environments such as the
ARC arch when using uClibc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'drm-misc-fixes-2019-05-02' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
- One revert for QXL for a DRI3 breakage
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190502122529.hguztj3kncaixe3d@flea
We were including sys/syscall.h and asm/unistd.h, since sys/syscall.h
includes asm/unistd.h, sometimes this leads to the redefinition of
defines, breaking the build.
Noticed on ARC with uCLibc.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Link: https://lkml.kernel.org/n/tip-xjpf80o64i2ko74aj2jih0qg@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Since those were introduced in:
c8ce48f065 ("asm-generic: Make time32 syscall numbers optional")
But when the asm-generic/unistd.h was sync'ed with tools/ in:
1a787fc5ba ("tools headers uapi: Sync copy of asm-generic/unistd.h with the kernel sources")
I forgot to copy the files for the architectures that define
__ARCH_WANT_TIME32_SYSCALLS, so the perf build was breaking there, as
reported by Vineet Gupta for the ARC architecture.
After updating my ARC container to use the glibc based toolchain + cross
building libnuma, zlib and elfutils, I finally managed to reproduce the
problem and verify that this now is fixed and will not regress as will
be tested before each pull req sent upstream.
Reported-by: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@kernel.org>
CC: linux-snps-arc@lists.infradead.org
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/r/20190426193531.GC28586@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Thomas Backlund reported that the perf build was failing on the Mageia 7
distro, that is because it uses:
cat /tmp/build/perf/feature/test-disassembler-four-args.make.output
/usr/bin/ld: /usr/lib64/libbfd.a(plugin.o): in function `try_load_plugin':
/home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:243:
undefined reference to `dlopen'
/usr/bin/ld:
/home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:271:
undefined reference to `dlsym'
/usr/bin/ld:
/home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:256:
undefined reference to `dlclose'
/usr/bin/ld:
/home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:246:
undefined reference to `dlerror'
as we allow dynamic linking and loading
Mageia 7 uses these linker flags:
$ rpm --eval %ldflags
-Wl,--as-needed -Wl,--no-undefined -Wl,-z,relro -Wl,-O1 -Wl,--build-id -Wl,--enable-new-dtags
So add -ldl to this feature LDFLAGS.
Reported-by: Thomas Backlund <tmb@mageia.org>
Tested-by: Thomas Backlund <tmb@mageia.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Link: https://lkml.kernel.org/r/20190501173158.GC21436@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Robert Walker reported a segmentation fault is observed when process
CoreSight trace data; this issue can be easily reproduced by the command
'perf report --itrace=i1000i' for decoding tracing data.
If neither the 'b' flag (synthesize branches events) nor 'l' flag
(synthesize last branch entries) are specified to option '--itrace',
cs_etm_queue::prev_packet will not been initialised. After merging the
code to support exception packets and sample flags, there introduced a
number of uses of cs_etm_queue::prev_packet without checking whether it
is valid, for these cases any accessing to uninitialised prev_packet
will cause crash.
As cs_etm_queue::prev_packet is used more widely now and it's already
hard to follow which functions have been called in a context where the
validity of cs_etm_queue::prev_packet has been checked, this patch
always allocates memory for cs_etm_queue::prev_packet.
Reported-by: Robert Walker <robert.walker@arm.com>
Suggested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Fixes: 7100b12cf4 ("perf cs-etm: Generate branch sample for exception packet")
Fixes: 24fff5eb2b ("perf cs-etm: Avoid stale branch samples when flush packet")
Link: http://lkml.kernel.org/r/20190428083228.20246-1-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Since cs_etm_queue::prev_packet is allocated for all cases, it will
never be NULL pointer; now validity checking prev_packet is pointless,
remove all of them.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190428083228.20246-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
