The HAVE_PWM symbol is only for legacy platforms that provide
the PWM API without using the generic framework. MXS actually
uses that framework, and selecting the symbol anyway might
cause build errors like
drivers/built-in.o: In function `pwm_beeper_resume':
:(.text+0x1f4fc0): undefined reference to `pwm_config'
:(.text+0x1f4fc8): undefined reference to `pwm_enable'
drivers/built-in.o: In function `pwm_beeper_suspend':
:(.text+0x1f4ffc): undefined reference to `pwm_disable'
when CONFIG_PWM is disabled.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
When building a kernel without CONFIG_PM, we get a link
error from referencing mxs_pm_init in the machine
descriptor. This defines a macro to NULL for that case.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Like other ARM specific drivers, this one requires ARM_CPU_SUSPEND,
as shown by this linker error:
drivers/built-in.o: In function `calxeda_pwrdown_idle':
drivers/cpuidle/cpuidle-calxeda.c:84: undefined reference to `cpu_suspend'
drivers/cpuidle/cpuidle-calxeda.c:86: undefined reference to `cpu_resume'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-pm@vger.kernel.org
The length of the registers area for the Marvell 370/XP Ethernet controller
was incorrect in the .dtsi: 0x2500, while it should have been 0x4000.
This problem wasn't noticed because there used to be a static mapping for
all the MMIO register region set up by ->map_io().
The register length was fixed in all the other device tree files,
except from the armada-xp-mv78260.dtsi, in the following commit:
commit cf8088c5ca
Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Tue May 21 12:33:27 2013 +0200
arm: mvebu: fix length of Ethernet registers area in .dtsi
This commit fixes a kernel panic in mvneta_probe(), when the kernel
tries to access the unmapped registers:
[ 163.639092] mvneta d0070000.ethernet eth0: mac: 6e:3c:4f:87:17:2e
[ 163.646962] mvneta d0074000.ethernet eth1: mac: 6a:04:4e:6f:f5:ef
[ 163.654853] mvneta d0030000.ethernet eth2: mac: 2a:99:19:19:fc:4c
[ 163.661258] Unable to handle kernel paging request at virtual address f011bcf0
[ 163.668523] pgd = c0004000
[ 163.671237] [f011bcf0] *pgd=2f006811, *pte=00000000, *ppte=00000000
[ 163.677565] Internal error: Oops: 807 [#1] SMP ARM
[ 163.682370] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc6-01850-gba0682e #11
[ 163.690046] task: ef04c000 ti: ef03e000 task.ti: ef03e000
[ 163.695467] PC is at mvneta_probe+0x34c/0xabc
[...]
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
- Add exynos filename match to ARM/S5P EXYNOS ARM ARCHITECTURES
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Merge tag 'non-critical-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/fixes-non-critical
From Kukjin Kim:
update MAINTAINER
- Add exynos filename match to ARM/S5P EXYNOS ARM ARCHITECTURES
* tag 'non-critical-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
MAINTAINERS: Add exynos filename match to ARM/S5P EXYNOS ARM ARCHITECTURES
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Merge tag 'at91-fixes' of git://github.com/at91linux/linux-at91 into next/fixes-non-critical
From Nicolas Ferre:
Two non critical fixes that can go in 3.11.
* tag 'at91-fixes' of git://github.com/at91linux/linux-at91:
ARM: at91: Change the internal SRAM memory type MT_MEMORY_NONCACHED
ARM: at91: Fix link breakage when !CONFIG_PHYLIB
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
I got a build error today that made me realize that it is not
possible to build a kernel for a SiRF platform without enabling
CONFIG_PRIMA2, since a lot of common code depends on CONFIG_PRIMA2.
This fixes all occurences that appear like common SiRF code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Mark Brown <broonie@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Barry Song <Baohua.Song@csr.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
The CLOCKSOURCE_OF_DECLARE functions now take a device_node pointer
as their argument, as of the clksrc/cleanup branch in arm-soc.
This patch adapts the bcm_kona_timer driver to the new interface.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christian Daudt <csd@broadcom.com>
Cc: John Stultz <john.stultz@linaro.org>
When building a kernel using 'make -s', I expect to see an empty output,
except for build warnings and errors. The build_OID_registry code
always prints one line when run, which is not helpful to most people
building the kernels, and which makes it harder to automatically
check for build warnings.
Let's just remove the one line output.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
The omap2 nand device driver calls into the the elm code, which can
be a loadable module, and in that case it cannot be built-in itself.
I can see no reason why the omap2 driver cannot also be a module,
so let's make the option "tristate" in Kconfig to fix this allmodconfig
build error:
ERROR: "elm_config" [drivers/mtd/nand/omap2.ko] undefined!
ERROR: "elm_decode_bch_error_page" [drivers/mtd/nand/omap2.ko] undefined!
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Afzal Mohammed <afzal@ti.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: linux-mtd@lists.infradead.org
ARM cannot handle udelay for more than 2 miliseconds, so we
should use mdelay instead for those.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: GOTO Masanori <gotom@debian.or.jp>
Cc: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
The MODULE_LICENSE macro invocation must use either "GPL" or "GPL v2",
but not "GPLv2" in order to be detected by the module loader.
This fixes the allmodconfig build error:
FATAL: modpost: GPL-incompatible module bcm2835-rng.ko uses GPL-only symbol 'platform_driver_unregister'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Dom Cobley <popcornmix@gmail.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: linux-rpi-kernel@lists.infradead.org
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Because MT_DEVICE is not executable in armv7, we change
the internal SRAM memory type to MT_MEMORY_NONCACHED.
As it seems that caching this internal SRAM memory is not necessary,
we chose the this memory type.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Fixes:
arch/arm/mach-at91/built-in.o: In function `ksz9021rn_phy_fixup':
:(.text+0x1174): undefined reference to `mdiobus_write'
:(.text+0x1188): undefined reference to `mdiobus_write'
:(.text+0x119c): undefined reference to `mdiobus_write'
:(.text+0x11b0): undefined reference to `mdiobus_write'
arch/arm/mach-at91/built-in.o: In function `sama5_dt_device_init':
:(.init.text+0x1e34): undefined reference to `phy_register_fixup_for_uid'
when CONFIG_PHYLIB is not selected.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This will help direct patches related to exynos to the
linux-samsung-soc mailing list for discussion.
Suggested by Joe Perches.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
I got an account "baohua" from kernel.org and I'll use this tree
to maintain CSR SoCs stuff:
git://git.kernel.org/pub/scm/linux/kernel/git/baohua/linux.git
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
I don't expect these to be necessary for stable, since the fixes are
to recently added code. The strncpy fix is only in debug code that
isn't normally compiled or used (and is being removed in upcoming
patches).
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Merge tag 'msm-fix-for-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm into next/fixes-non-critical
From David Brown:
Some minor fixes for MSM for 3.11
I don't expect these to be necessary for stable, since the fixes are
to recently added code. The strncpy fix is only in debug code that
isn't normally compiled or used (and is being removed in upcoming
patches).
* tag 'msm-fix-for-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
gpio: msm-v1: Remove errant __devinit to fix compile
mfd: ssbi: Add MODULE_DEVICE_TABLE
ARM: dts: msm: Fix bad register addresses
arch: arm: mach-msm: using strlcpy instead of strncpy
Signed-off-by: Olof Johansson <olof@lixom.net>
to drop a stale maintainer name and address.
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Merge tag 'davinci-for-v3.11/board' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into next/fixes-non-critical
From Sekhar Nori:
This pull request contains a trival change
to drop a stale maintainer name and address.
* tag 'davinci-for-v3.11/board' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci:
ARM: davinci: remove stale SFFSDR maintainer name
Signed-off-by: Olof Johansson <olof@lixom.net>
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Merge tag 'omap-for-v3.11/fixes-non-critical-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/fixes-non-critical
From Tony Lindgren:
Non-critical fixes for omaps for v3.11 merge window.
* tag 'omap-for-v3.11/fixes-non-critical-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP2+: omap-usb-host: Fix memory leaks
ARM: OMAP2+: Fix serial init for device tree based booting
arm/omap: use const char properly
ARM: OMAP2+: devices: Do not print error when dss_hdmi hwmod lookup fails
ARM: OMAP2+: devices: Do not print error when DMIC hwmod lookup fails
ARM: OMAP2+: devices: Do not print error when McPDM hwmod lookup fails
ARM: OMAP: add vdds_sdi supply for omapdss_sdi.0
ARM: OMAP: add vdds_dsi supply for omapdss_dpi.0
ARM: OMAP: fix dsi regulator names
+ Linux 3.10-rc5
Signed-off-by: Olof Johansson <olof@lixom.net>
The maintainer entry for SFFSDR board contained in the
board file is stale (not working). Remove it.
Signed-off-by: Hugo Villeneuve <hugo@hugovil.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Commit 7bce696 (gpio: Make gpio-msm-v1 into a platform driver,
2013-03-04) was based on an older kernel where __devinit still
existed. Remove the erroneous __devinit marking.
Cc: David Brown <davidb@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
This allows the ssbi module to be autoloaded on boot.
Cc: David Brown <davidb@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
Fix memory leaks in the error path.
Also, use platform_device_register_full() to allocate
the platform devices and set platform data.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
We don't want to call omap_serial_early_init() for device
tree based booting as the ports are initialized based on
the .dts entries.
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The itention was probably to make both pointers const but as it is now,
it is just const used twice.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The dss_hdmi hwmod is used to create the HDMI audio device for OMAP4+
When we boot the kernel we can silently ignore the failure since the IP
does not exist on them.
Reported-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
It means that the SoC does not have DMIC IP.
Reported-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
It means that the SoC does not have McPDM IP.
Reported-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
SDI driver gets currently the vdds_sdi regulator via omapdss device.
This is not correct, and we'll change the SDI driver to get the
regulator directly via omapdss_sdi.0 device.
This patch changes the rx51 board file to add vdds_dsi supply for
omapdss_sdi.0 device.
Note that the vdds_sdi supply for omapdss device is still left there, as
the current display driver uses it. When both the board files and the
display driver has been changed, we can remove the unused supply.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
DPI driver gets currently the vdds_dsi regulator via omapdss device.
This is not correct, and we'll change the DPI driver to get the
regulator directly via omapdss_dpi.0 device.
This patch changes the relevant board files to add vdds_dsi supply for
omapdss_dpi.0 device.
Note that the vdds_dsi supply for omapdss device is still left there, as
the current display driver uses it. When both the board files and the
display driver has been changed, we can remove the unused supply.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
board-cm-t35.c and board-ldp.c contain regulator supply entries for
vdds_dsi. However, the given device name is wrong.
This patch fixes the device name from omapdss_dsi1 to omapdss_dsi.0.
Note that as far as I know, DSI driver is not used on these boards, so
this should not have caused any problems. The DSI block can be used to
generate clock for DPI, though, but that's not enabled for omap3 boards
currently.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
- Replace include linux/module.h with linux/export.h
- fix a checkpatch issue
- use of_platform_populate instead of of_platform_bus_probe
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Merge tag 'sirf-arm-soc-v3.10-fixes' of git://gitorious.org/sirfprima2-kernel/sirfprima2-kernel into next/fixes-non-critical
From Barry Song, SiRF fixes for v3.10 (that we're punting to 3.11):
- Replace include linux/module.h with linux/export.h
- fix a checkpatch issue
- use of_platform_populate instead of of_platform_bus_probe
* tag 'sirf-arm-soc-v3.10-fixes' of git://gitorious.org/sirfprima2-kernel/sirfprima2-kernel:
arm: prima2: use of_platform_populate instead of of_platform_bus_probe
ARM: prima2: fix a checkpatch issue
ARM: prima2: Replace include linux/module.h with linux/export.h
+ Linux 3.10-rc4
Signed-off-by: Olof Johansson <olof@lixom.net>
Pull timer fixes from Thomas Gleixner:
- Trivial: unused variable removal
- Posix-timers: Add the clock ID to the new proc interface to make it
useful. The interface is new and should be functional when we reach
the final 3.10 release.
- Cure a false positive warning in the tick code introduced by the
overhaul in 3.10
- Fix for a persistent clock detection regression introduced in this
cycle
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
timekeeping: Correct run-time detection of persistent_clock.
ntp: Remove unused variable flags in __hardpps
posix-timers: Show clock ID in proc file
tick: Cure broadcast false positive pending bit warning
This branch contains a set of straight forward bug fixes to the
irqdomain code and to a couple of drivers that make use of it.
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Merge tag 'irqdomain-for-linus' of git://git.secretlab.ca/git/linux
Pull irqdomain bug fixes from Grant Likely:
"This branch contains a set of straight forward bug fixes to the
irqdomain code and to a couple of drivers that make use of it."
* tag 'irqdomain-for-linus' of git://git.secretlab.ca/git/linux:
irqchip: Return -EPERM for reserved IRQs
irqdomain: document the simple domain first_irq
kernel/irq/irqdomain.c: before use 'irq_data', need check it whether valid.
irqdomain: export irq_domain_add_simple
The irqdomain core will report a log message for any attempted map call
that fails unless the error code is -EPERM. This patch changes the
Versatile irq controller drivers to use -EPERM because it is normal for
a subset of the IRQ inputs to be marked as reserved on the various
Versatile platforms.
Signed-off-by: Grant Likely <grant.likely@linaro.org>
The first_irq needs to be zero to get a linear domain and that
comes with special semantics. We want to simplify this going
forward but some documentation never hurts.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Since irq_data may be NULL, if so, we WARN_ON(), and continue, 'hwirq'
which related with 'irq_data' has to initialize later, or it will cause
issue.
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
All other irq_domain_add_* functions are exported already, and apparently
this one got left out by mistake, which causes build errors for ARM
allmodconfig kernels:
ERROR: "irq_domain_add_simple" [drivers/gpio/gpio-rcar.ko] undefined!
ERROR: "irq_domain_add_simple" [drivers/gpio/gpio-em.ko] undefined!
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Another week, another batch of fixes for arm-soc platforms.
Nothing controversial here, a handful of fixes for regressions and/or
serious problems across several of the platforms. Things are slowing
down nicely on fix rates for 3.10.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"Another week, another batch of fixes for arm-soc platforms.
Nothing controversial here, a handful of fixes for regressions and/or
serious problems across several of the platforms. Things are slowing
down nicely on fix rates for 3.10"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: exynos: add debug_ll_io_init() call in exynos_init_io()
ARM: EXYNOS: uncompress - print debug messages if DEBUG_LL is defined
ARM: shmobile: sh73a0: Update CMT clockevent rating to 80
sh-pfc: r8a7779: Don't group USB OVC and PENC pins
ARM: mxs: icoll: Fix interrupts gpio bank 0
ARM: imx: clk-imx6q: AXI clock select index is incorrect
ARM: bcm2835: override the HW UART periphid
ARM: mvebu: Fix bug in coherency fabric low level init function
ARM: Kirkwood: TS219: Fix crash by double PCIe instantiation
ARM: ux500: Provide supplies for AUX1, AUX2 and AUX3
ARM: ux500: Only configure wake-up reasons on ux500 based platforms
ARM: dts: imx: fix clocks for cspi
ARM i.MX6q: fix for ldb_di_sels
Pull MIPS fixes from Ralf Baechle:
"MIPS fixes across the field. The only area that's standing out is the
exception handling which received it's dose of breakage as part of the
microMIPS patchset"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: ralink: add missing SZ_1M multiplier
MIPS: Compat: Fix cputime_to_timeval() arguments in compat binfmt_elf.
MIPS: OCTEON: Improve _machine_halt implementation.
MIPS: rtlx: Fix implicit declaration of function set_vi_handler()
MIPS: Trap exception handling fixes
MIPS: Quit exposing Kconfig symbols in uapi headers.
MIPS: Remove duplicate definition of check_for_high_segbits.
Pull m68knommu fix from Greg Ungerer:
"A single fix for compilation breakage to many of the ColdFire CPU
targets"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
m68k: only use local gpio_request_one if not using GPIOLIB
Pull drm fixes from Dave Airlie:
"Regression fixers for the big 3:
- nouveau: hdmi audio, dac load detect, s/r regressions fixed
- radeon: long standing system hang fixed, hdmi audio and rs780 fast
fb fixes
- intel: one old regression, a WARN removal, and a stop X dying fix
Otherwise one mgag200 fix, a couple of arm build fixes, and a core use
after free fix."
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/nv50/kms: use dac loadval from vbios, where it's available
drm/nv50/disp: force dac power state during load detect
drm/nv50-nv84/fifo: fix resume regression introduced by playlist race fix
drm/nv84/disp: Fix HDMI audio regression
drm/i915/sdvo: Use &intel_sdvo->ddc instead of intel_sdvo->i2c for DDC.
drm/radeon: don't allow audio on DCE6
drm/radeon: Use direct mapping for fast fb access on RS780/RS880 (v2)
radeon: Fix system hang issue when using KMS with older cards
drm/i915: no lvds quirk for hp t5740
drm/i915: Quirk the pipe A quirk in the modeset state checker
drm/i915: Fix spurious -EIO/SIGBUS on wedged gpus
drm/mgag200: Add missing write to index before accessing data register
drm/nouveau: use mdelay instead of large udelay constants
drm/tilcd: select BACKLIGHT_LCD_SUPPORT
drm: fix a use-after-free when GPU acceleration disabled
Pull slave-dmaengine fixes from Vinod Koul:
"Fix from Andy is for dmatest regression reported by Will and Rabin has
fixed runtime ref counting for st_dma40"
* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
dmatest: do not allow to interrupt ongoing tests
dmaengine: ste_dma40: fix pm runtime ref counting
The first two fix the case where full RCU debugging is enabled, enabling
function tracing causes a live lock of the system. This is due to the added
debug checks in rcu_dereference_raw() that is used by the function tracer.
These checks are also traced by the function tracer as well as cause enough
overhead to the function tracer to slow down the system enough that
the time to finish an interrupt can take longer than when the next
interrupt is triggered, causing a live lock from the timer interrupt.
Talking this over with Paul McKenney, we came up with a fix that adds
a new rcu_dereference_raw_notrace() that does not perform these added checks,
and let the function tracer use that.
The third commit fixes a failed compile when branch tracing is enabled,
due to the conversion of the trace_test_buffer() selftest that the
branch trace wasn't converted for.
The forth patch fixes a bug caught by the RCU lockdep code where a
rcu_read_lock() is performed when rcu is disabled (either going to
or from idle, or user space). This happened on the irqsoff tracer
as it calls task_uid(). The fix here was to use current_uid() when
possible that doesn't use rcu locking. Which luckily, is always used
when irqsoff calls this code.
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Merge tag 'trace-fixes-v3.10-rc3-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
"This contains 4 fixes.
The first two fix the case where full RCU debugging is enabled,
enabling function tracing causes a live lock of the system. This is
due to the added debug checks in rcu_dereference_raw() that is used by
the function tracer. These checks are also traced by the function
tracer as well as cause enough overhead to the function tracer to slow
down the system enough that the time to finish an interrupt can take
longer than when the next interrupt is triggered, causing a live lock
from the timer interrupt.
Talking this over with Paul McKenney, we came up with a fix that adds
a new rcu_dereference_raw_notrace() that does not perform these added
checks, and let the function tracer use that.
The third commit fixes a failed compile when branch tracing is
enabled, due to the conversion of the trace_test_buffer() selftest
that the branch trace wasn't converted for.
The forth patch fixes a bug caught by the RCU lockdep code where a
rcu_read_lock() is performed when rcu is disabled (either going to or
from idle, or user space). This happened on the irqsoff tracer as it
calls task_uid(). The fix here was to use current_uid() when possible
that doesn't use rcu locking. Which luckily, is always used when
irqsoff calls this code."
* tag 'trace-fixes-v3.10-rc3-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Use current_uid() for critical time tracing
tracing: Fix bad parameter passed in branch selftest
ftrace: Use the rcu _notrace variants for rcu_dereference_raw() and friends
rcu: Add _notrace variation of rcu_dereference_raw() and hlist_for_each_entry_rcu()
Commit 9f29ab11dd ("ACPI / scan: do not match drivers against objects
having scan handlers") introduced a boot regression on Tony's ia64 HP
rx2600. Tony says:
"It panics with the message:
Kernel panic - not syncing: Unable to find SBA IOMMU: Try a generic or DIG kernel
[...] my problem comes from arch/ia64/hp/common/sba_iommu.c
where the code in sba_init() says:
acpi_bus_register_driver(&acpi_sba_ioc_driver);
if (!ioc_list) {
but because of this change we never managed to call ioc_init()
so ioc_list doesn't get set up, and we die."
Revert it to avoid this breakage and we'll fix the problem it attempted
to address later.
Reported-by: Tony Luck <tony.luck@gmail.com>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
