NeilBrown 5d240a8936 rhashtable: improve rhashtable_walk stability when stop/start used. ... When a walk of an rhashtable is interrupted with rhastable_walk_stop() and then rhashtable_walk_start(), the location to restart from is based on a 'skip' count in the current hash chain, and this can be incorrect if insertions or deletions have happened. This does not happen when the walk is not stopped and started as iter->p is a placeholder which is safe to use while holding the RCU read lock. In rhashtable_walk_start() we can revalidate that 'p' is still in the same hash chain. If it isn't then the current method is still used. With this patch, if a rhashtable walker ensures that the current object remains in the table over a stop/start period (possibly by elevating the reference count if that is sufficient), it can be sure that a walk will not miss objects that were in the hashtable for the whole time of the walk. rhashtable_walk_start() may not find the object even though it is still in the hashtable if a rehash has moved it to a new table. In this case it will (eventually) get -EAGAIN and will need to proceed through the whole table again to be sure to see everything at least once. Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2018-04-24 13:21:46 -04:00
..
842
fonts
lz4
lzo
mpi
raid6	powerpc updates for 4.17	2018-04-07 12:08:19 -07:00
reed_solomon
xz
zlib_deflate
zlib_inflate
zstd	lib: zstd: clean up Makefile for simpler composite object handling	2018-03-26 02:01:27 +09:00
.gitignore
argv_split.c
ashldi3.c
ashrdi3.c
asn1_decoder.c
assoc_array.c
atomic64.c
atomic64_test.c
audit.c
bcd.c
bch.c
bitmap.c	lib: fix stall in __bitmap_parselist()	2018-04-05 21:36:21 -07:00
bitrev.c
bsearch.c
btree.c	btree: avoid variable-length allocations	2018-03-14 16:55:29 -07:00
bucket_locks.c
bug.c	lib/bug.c: exclude non-BUG/WARN exceptions from report_bug()	2018-03-09 16:40:01 -08:00
build_OID_registry
bust_spinlocks.c
chacha20.c
check_signature.c
checksum.c
clz_ctz.c
clz_tab.c
cmdline.c
cmpdi2.c
compat_audit.c
cordic.c
cpu_rmap.c
cpumask.c
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc4.c
crc7.c
crc8.c
crc16.c
crc32.c
crc32defs.h
crc32test.c
ctype.c
debug_info.c
debug_locks.c
debugobjects.c	debugobjects: Avoid another unused variable warning	2018-03-14 20:20:01 +01:00
dec_and_lock.c
decompress.c
decompress_bunzip2.c
decompress_inflate.c
decompress_unlz4.c
decompress_unlzma.c
decompress_unlzo.c
decompress_unxz.c
devres.c	devres: combine function devm_ioremap*	2018-03-15 18:08:55 +01:00
digsig.c
div64.c
dma-debug.c	dma-debug: fix memory leak in debug_dma_alloc_coherent	2018-02-22 15:02:33 -08:00
dma-direct.c	dma-mapping: Don't clear GFP_ZERO in dma_alloc_attrs	2018-03-28 17:34:23 +02:00
dma-virt.c
dump_stack.c	printk: move dump stack related code to lib/dump_stack.c	2018-03-15 13:25:36 +01:00
dynamic_debug.c
dynamic_queue_limits.c
earlycpio.c
error-inject.c
errseq.c
extable.c
fault-inject.c
fdt.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
find_bit.c
find_bit_benchmark.c
flex_array.c
flex_proportions.c
gcd.c
gen_crc32table.c
genalloc.c
glob.c
globtest.c
hexdump.c
hweight.c
idr.c	idr: Fix handling of IDs above INT_MAX	2018-02-26 14:39:30 -05:00
inflate.c
int_sqrt.c
interval_tree.c
interval_tree_test.c
iomap.c
iomap_copy.c
iommu-common.c
iommu-helper.c
ioremap.c	mm/vmalloc: add interfaces to free unmapped page table	2018-03-22 17:07:01 -07:00
iov_iter.c
irq_poll.c
irq_regs.c
is_single_threaded.c
jedec_ddr_data.c
kasprintf.c
Kconfig	lib: Add generic PIO mapping method	2018-03-21 17:18:34 -05:00
Kconfig.debug	lib/Kconfig.debug: Debug Lockups and Hangs: keep SOFTLOCKUP options together	2018-04-11 10:28:35 -07:00
Kconfig.kasan
Kconfig.kgdb
Kconfig.ubsan	lib: add testing module for UBSAN	2018-04-11 10:28:35 -07:00
kfifo.c	kfifo: fix inaccurate comment	2018-03-27 11:15:42 +02:00
klist.c
kobject.c	lib/kobject: Join string literals back	2018-03-15 14:38:55 +01:00
kobject_uevent.c	net: Drop pernet_operations::async	2018-03-27 13:18:09 -04:00
kstrtox.c
kstrtox.h
lcm.c
libcrc32c.c	libcrc32c: Add crc32c_impl function	2018-03-26 15:09:38 +02:00
list_debug.c	lib/list_debug.c: print unmangled addresses	2018-04-11 10:28:35 -07:00
list_sort.c
llist.c
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-rtmutex.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c
lockref.c	lockref: Add lockref_put_not_zero	2018-04-12 09:41:19 -07:00
logic_pio.c	lib: Add generic PIO mapping method	2018-03-21 17:18:34 -05:00
lru_cache.c
lshrdi3.c
Makefile	lib: add testing module for UBSAN	2018-04-11 10:28:35 -07:00
memory-notifier-error-inject.c
memweight.c
muldi3.c
net_utils.c
netdev-notifier-error-inject.c
nlattr.c
nmi_backtrace.c
nodemask.c
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
once.c
parman.c
parser.c
pci_iomap.c
percpu-refcount.c	percpu_ref: Update doc to dissuade users from depending on internal RCU grace periods	2018-03-19 10:09:44 -07:00
percpu_counter.c
percpu_ida.c
percpu_test.c
plist.c
pm-notifier-error-inject.c
prime_numbers.c
radix-tree.c	radix tree: use GFP_ZONEMASK bits of gfp_t for flags	2018-04-11 10:28:39 -07:00
random32.c
ratelimit.c
rational.c
rbtree.c
rbtree_test.c
reciprocal_div.c
refcount.c
rhashtable.c	rhashtable: improve rhashtable_walk stability when stop/start used.	2018-04-24 13:21:46 -04:00
sbitmap.c	sbitmap: use test_and_set_bit_lock()/clear_bit_unlock()	2018-02-28 12:23:35 -07:00
scatterlist.c	lib/scatterlist: add sg_init_marker() helper	2018-03-30 22:50:15 +02:00
seq_buf.c
sg_pool.c
sg_split.c
sha1.c
sha256.c	kernel/kexec_file.c: move purgatories sha256 to common code	2018-04-13 17:10:28 -07:00
show_mem.c
siphash.c
smp_processor_id.c
sort.c
stackdepot.c
stmp_device.c
string.c
string_helpers.c
strncpy_from_user.c
strnlen_user.c
swiotlb.c	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 16:12:35 -07:00
syscall.c
test-kstrtox.c
test-string_helpers.c
test_bitmap.c	lib/test_bitmap.c: do not accidentally use stack VLA	2018-04-11 10:28:35 -07:00
test_bpf.c	test_bpf: Fix NULL vs IS_ERR() check in test_skb_segment()	2018-03-29 14:33:29 -04:00
test_debug_virtual.c
test_firmware.c	headers: untangle kmemleak.h from mm.h	2018-04-05 21:36:27 -07:00
test_hash.c
test_hexdump.c
test_kasan.c	kasan: fix invalid-free test crashing the kernel	2018-04-11 10:28:32 -07:00
test_kmod.c	lib/test_kmod.c: fix limit check on number of test devices created	2018-03-09 16:40:02 -08:00
test_list_sort.c
test_module.c
test_parman.c
test_printf.c
test_rhashtable.c	test_rhashtable: add test case for rhltable with duplicate objects	2018-03-07 10:44:03 -05:00
test_siphash.c
test_sort.c
test_static_key_base.c
test_static_keys.c
test_string.c
test_sysctl.c
test_ubsan.c	lib/test_ubsan.c: make test_ubsan_misaligned_access() static	2018-04-11 10:28:35 -07:00
test_user_copy.c	treewide: simplify Kconfig dependencies for removed archs	2018-03-26 15:55:57 +02:00
test_uuid.c
textsearch.c	textsearch: fix kernel-doc warnings and add kernel-api section	2018-04-16 18:53:13 -04:00
timerqueue.c
ts_bm.c
ts_fsm.c
ts_kmp.c
ubsan.c
ubsan.h
ucmpdi2.c
ucs2_string.c
usercopy.c
uuid.c
vsprintf.c	proc: add seq_put_decimal_ull_width to speed up /proc/pid/smaps	2018-04-11 10:28:33 -07:00
win_minmax.c
xxhash.c