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The new nmi_watchdog (which uses the perf event subsystem) is very
similar in structure to the softlockup detector. Using Ingo's
suggestion, I combined the two functionalities into one file:
kernel/watchdog.c.
Now both the nmi_watchdog (or hardlockup detector) and softlockup
detector sit on top of the perf event subsystem, which is run every
60 seconds or so to see if there are any lockups.
To detect hardlockups, cpus not responding to interrupts, I
implemented an hrtimer that runs 5 times for every perf event
overflow event. If that stops counting on a cpu, then the cpu is
most likely in trouble.
To detect softlockups, tasks not yielding to the scheduler, I used the
previous kthread idea that now gets kicked every time the hrtimer fires.
If the kthread isn't being scheduled neither is anyone else and the
warning is printed to the console.
I tested this on x86_64 and both the softlockup and hardlockup paths
work.
V2:
- cleaned up the Kconfig and softlockup combination
- surrounded hardlockup cases with #ifdef CONFIG_PERF_EVENTS_NMI
- seperated out the softlockup case from perf event subsystem
- re-arranged the enabling/disabling nmi watchdog from proc space
- added cpumasks for hardlockup failure cases
- removed fallback to soft events if no PMU exists for hard events
V3:
- comment cleanups
- drop support for older softlockup code
- per_cpu cleanups
- completely remove software clock base hardlockup detector
- use per_cpu masking on hard/soft lockup detection
- #ifdef cleanups
- rename config option NMI_WATCHDOG to LOCKUP_DETECTOR
- documentation additions
V4:
- documentation fixes
- convert per_cpu to __get_cpu_var
- powerpc compile fixes
V5:
- split apart warn flags for hard and soft lockups
TODO:
- figure out how to make an arch-agnostic clock2cycles call
(if possible) to feed into perf events as a sample period
[fweisbec: merged conflict patch]
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
LKML-Reference: <1273266711-18706-2-git-send-email-dzickus@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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Merge reason: catch up with latest softlockup detector changes.
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git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'v4l_for_2.6.34' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6:
V4L/DVB: pxa_camera: move fifo reset direct before dma start
V4L/DVB: video: testing unsigned for less than 0
V4L/DVB: mx1-camera: compile fix
V4L/DVB: budget: Oops: "BUG: unable to handle kernel NULL pointer dereference"
V4L/DVB: ngene: Workaround for stuck DiSEqC pin
V4L/DVB: saa7146: fix regression of the av7110/budget-av driver
V4L/DVB: v4l: fix config dependencies: mxb and saa7191 are V4L2 drivers, not V4L1
V4L/DVB: feature-removal: announce videotext.h removal
V4L/DVB: V4L - vpfe capture - fix for kernel crash
V4L/DVB: gspca: make usb id 0461:0815 get handled by the right driver
V4L/DVB: gspca - stv06xx: Remove the 046d:08da from the stv06xx driver
V4L/DVB: gspca - sn9c20x: Correct onstack wait_queue_head declaration
V4L/DVB: saa7146: fix up bytesperline if it is an impossible value
V4L/DVB: V4L: vpfe_capture - free ccdc_lock when memory allocation fails
V4L/DVB: V4L - Makfile:Removed duplicate entry of davinci
V4L/DVB: omap24xxcam: potential buffer overflow
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This fixes a regression of
7d58289 (mx1: prefix SOC specific defines with MX1_ and deprecate old names)
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Defconfig update
microblaze: Optimize CACHE_LOOP_LIMITS and CACHE_RANGE_LOOP macros
microblaze: Fix consistent-sync code
microblaze: Define correct L1_CACHE_SHIFT value
microblaze: cpuinfo shows cache line length
microblaze: Fix kmalloc alignment on non-coherent DMA platforms
microblaze: Fix typo fault in cache code
microblaze: Fix consistent code
microblaze: pci-dma: use include/linux/dma-mapping.h
microblaze: page.h: Remove get_user_page and free_user_page
microblaze: Remove "cache" optimized copy_page function
microblaze: invoke oom-killer from page fault
microblaze: fix divide by zero exception message
microblaze: Add isa_dma_bridge_buggy to dma.h
microblaze: Remove ancient code
microblaze: Quiet section mismatch warnings for MMU version
microblaze: Quiet section mismatch warnings
microblaze: Fix IRQ entry/exit ftracing
microblaze: resource/PCI: align functions now return start of resource
microblaze: PCI: add pci_bus_for_each_resource(), remove direct bus->resource[] refs
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* master.kernel.org:/home/rmk/linux-2.6-arm:
[ARM] pxa/colibri: fix missing #include <mach/mfp.h> in colibri.h
[ARM] pxa/spitz: fix On/off key name to fix warning during boot
[ARM] pxa: fix the incorrect cpu_is_pxa950()
[ARM] pxa: update cpuid pattern for pxa9xx in head.S
[ARM] pxa/viper: fix timeout usage for I2C
[ARM] pxa/raumfeld: fix button name
[ARM] pxa/imote2: Fix iMote2 defconfig
[ARM] pxa: add missing new line to regs-u2d.h
ARM: 6093/1: Fix kernel memory printing for sparsemem
arch/arm/include/asm/elf.h: forward-declare the task-struct
arch/arm/plat-pxa/dma.c: correct NULL test
ARM: 6076/1: SA1100: add processor check to sa1110-cpufreq driver
ARM: 6075/1: SA1100: fix wrong CPU type for h3100 and h3600
ARM: Update mach-types
ARM: 6066/1: Fix "BUG: scheduling while atomic: swapper/0/0x00000002
ARM: 6068/1: Fix build break with KPROBES enabled
mx5: Fix build error for mx51_defconfig
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git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* 'sh/for-2.6.34' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
sh: fix a number of Oopses and leaks in SH framebuffer driver
SH: fix error paths in DMA driver
sh: sh7751 pci controller io port fix
sh: Fix maximum number of SCIF ports in R2D defconfigs
SH: fix TS field shift calculation for DMA drivers
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Signed-off-by: Michal Simek <monstr@monstr.eu>
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1. Remove CACHE_ALL_LOOP2 macro because it is identical to CACHE_ALL_LOOP
2. Change BUG_ON to WARN_ON
3. Remove end aligned from CACHE_LOOP_LIMITS.
C implementation do not need aligned end address and ASM code do aligned
in their macros
4. ASM optimized CACHE_RANGE_LOOP_1/2 macros needs to get aligned end address.
Because end address is compound from start + size, end address is the first address
which is exclude.
Here is the corresponding code which describe it.
+ int align = ~(line_length - 1);
+ end = ((end & align) == end) ? end - line_length : end & align;
a) end is aligned:
it is necessary to subtruct line length because we don't want to work with
next cacheline
b) end address is not aligned:
Just align it to be ready for ASM code.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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PCI_DMA_FROMDEVICE should call invalidation not flushing.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Microblaze cacheline length is configurable and current cpu
uses two cacheline length 4 and 8.
We are taking conservative maximum value to be sure that cacheline
alignment is satisfied for all cases.
Here is the calculation for cacheline lenght 8 32bit=4Byte values
which is corresponding with SHIFT 5.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Show cache line length in /proc/cpuinfo.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Based on PowerPC patche 52142e756e9bf6485d3d53596e8aff2e816a7253
PowerPC description:
On platforms doing non-coherent DMA (4xx, 8xx, ...), it's important
that the kmalloc minimum alignment is set to the cache line size, to
avoid sharing cache lines between different objects, so that DMA to
one of the objects doesn't corrupt the other.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Copy & paste error.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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This patch fix consistent code which had problems with consistent_free
function.
I am not sure if we need to call flush_tlb_all after it but it keeps
tlbs synced.
I added noMMU and MMU version together.
Uncached shadow feature is not tested.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Based on af407c6db16aa9ca63559076dbe620220a822580
and f41b177157718abe9a93868bb76e47d4a6f3681d
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Remove ancient macros which are here from Linux-2.4
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Current implementation doesn't handle dcache_line_length
correctly that's why is better to use generic memcpy.
Cache optimized function could be good way howto improve
performance but must be based on benchmarking not blind
function like this.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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As explained in commit 1c0fe6e3bd, we want to call the architecture independent
oom killer when getting an unexplained OOM from handle_mm_fault, rather than
simply killing current.
Cc: microblaze-uclinux@itee.uq.edu.au
Cc: Michal Simek <monstr@monstr.eu>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Simek <monstr@monstr.eu>
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Fix divide exception message to say "divide by zero".
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: microblaze-uclinux@itee.uq.edu.au
Signed-off-by: Michal Simek <monstr@monstr.eu>
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It is necessary for several drivers.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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I found several function which we don't use that's why I am removing them.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Remove section mismatch - based on ppc aproach.
WARNING: vmlinux.o(.text+0x64834): Section mismatch in reference
from the function __pte_alloc_kernel() to the function .init.text:early_get_page()
The function __pte_alloc_kernel() references
the function __init early_get_page().
This is often because __pte_alloc_kernel lacks a __init
annotation or the annotation of early_get_page is wrong.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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_start is located in .text, which causes mismatch warnings with
machine_early_init() and start_kernel() in .init.text.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Function traces on Microblaze don't include IRQ entry and exit arrows,
i.e.
0) | memcpy_toiovec() {
0) ==========> |
0) | do_IRQ() {
...
0) <========== |
0) ! 5414.000 us | }
...because do_IRQ() doesn't have the proper attributes.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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This change should be part of b26b2d494b659f988b4d75eb394dfa0ddac415c9
Origin description:
resource/PCI: align functions now return start of resource
As suggested by Linus, align functions should return the start
of a resource, not void. An update of "res->start" is no longer
necessary.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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bus->resource[] refs
This change should be part of 89a74ecccd1f78e51faf6287e5c0e93a92ac096e
Origin description:
PCI: add pci_bus_for_each_resource(), remove direct bus->resource[] refs
No functional change; this converts loops that iterate from 0 to
PCI_BUS_NUM_RESOURCES through pci_bus resource[] table to use the
pci_bus_for_each_resource() iterator instead.
This doesn't change the way resources are stored; it merely removes
dependencies on the fact that they're in a table.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6
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The use of mfp_cfg_t causes build errors without including <mach/mfp.h>.
CC: stable@kernel.org
CC: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Jakob Viketoft <jakob.viketoft@bitsim.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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On/Off contains slash in the name, which causes warning during boot.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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Fix the wrong variable used in cpu_is_pxa950().
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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Update CPUID pattern of PXA9xx in head.S and fix the duplicate
entries for pxa935.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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The timeout value is in jiffies, so it should be using HZ, not a plain
number. Assume with HZ=100 '100' means 1s here and adapt accordingly.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Marc Zyngier <maz@misterjones.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Paul Shen <paul.shen@marvell.com>
Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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"on/off button" was recently renamed to remove the slash character.
Follow that change in the pin polarity detection as well.
While at it, fix another cosmetic coding style flaw as well.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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- Bring in a CMDLINE that actually works and prints to the right tty
- Compile-in JFFS2 to boot into rootfs
- Remove unneeded options for Bluetooth and radio
- Disable CPU_FREQ as it makes the flash driver fail
Thanks Jonathan for spotting what I messed up.
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip:
powernow-k8: Fix frequency reporting
x86: Fix parse_reservetop() build failure on certain configs
x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests
x86: Fix 'reservetop=' functionality
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The x86_64 call_rwsem_wait() treats the active state counter part of the
R/W semaphore state as being 16-bit when it's actually 32-bit (it's half
of the 64-bit state). It should do "decl %edx" not "decw %dx".
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The show_mem() and mem_init() function are assuming that the page map is
contiguous and calculates the start and end page of a bank using (map +
pfn). This fails with SPARSEMEM where pfn_to_page() must be used.
Tested-by: Will Deacon <Will.Deacon@arm.com>
Tested-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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With F10, model 10, all valid frequencies are in the ACPI _PST table.
Cc: <stable@kernel.org> # 33.x 32.x
Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
LKML-Reference: <1270065406-1814-6-git-send-email-bp@amd64.org>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Reviewed-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Commit e67a807 ("x86: Fix 'reservetop=' functionality") added a
fixup_early_ioremap() call to parse_reservetop() and declared it
in io.h.
But asm/io.h was only included indirectly - and on some configs
not at all, causing a build failure on those configs.
Cc: Liang Li <liang.li@windriver.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Wang Chen <wangchen@cn.fujitsu.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <1272621711-8683-1-git-send-email-liang.li@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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iop32x_defconfig:
In file included from include/linux/elf.h:7,
from kernel/elfcore.c:1:
arch/arm/include/asm/elf.h:101: warning: "struct task_struct" declared inside parameter list
arch/arm/include/asm/elf.h:101: warning: its scope is only this definition or declaration, which is probably not what you want
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Test the just-allocated value for NULL rather than some other value.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x,y;
statement S;
@@
x = \(kmalloc\|kcalloc\|kzalloc\)(...);
(
if ((x) == NULL) S
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if (
- y
+ x
== NULL)
S
)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Just to make sure that this driver won't run on StrongArm SA1100
when both SA1100 and SA1110 cpufreq drivers are built in (usually
in multimachine config). SA1100 driver already has similar check.
Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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They have StrongARM SA1110, not SA1100.
Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch fixes the preempt leak in the cpuidle path invoked from
cpu-hotplug. The fix is suggested by Russell King and is based
on x86 idea of calling init_idle() on the idle task when it's
re-used which also resets the preempt count amongst other things
dump:
BUG: scheduling while atomic: swapper/0/0x00000002
Modules linked in:
Backtrace:
[<c0024f90>] (dump_backtrace+0x0/0x110) from [<c0173bc4>] (dump_stack+0x18/0x1c)
r7:c02149e4 r6:c033df00 r5:c7836000 r4:00000000
[<c0173bac>] (dump_stack+0x0/0x1c) from [<c003b4f0>] (__schedule_bug+0x60/0x70)
[<c003b490>] (__schedule_bug+0x0/0x70) from [<c0174214>] (schedule+0x98/0x7b8)
r5:c7836000 r4:c7836000
[<c017417c>] (schedule+0x0/0x7b8) from [<c00228c4>] (cpu_idle+0xb4/0xd4)
# [<c0022810>] (cpu_idle+0x0/0xd4) from [<c0171dd8>] (secondary_start_kernel+0xe0/0xf0)
r5:c7836000 r4:c0205f40
[<c0171cf8>] (secondary_start_kernel+0x0/0xf0) from [<c002d57c>] (prm_rmw_mod_reg_bits+0x88/0xa4)
r7:c02149e4 r6:00000001 r5:00000001 r4:c7836000
Backtrace aborted due to bad frame pointer <c7837fbc>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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With CONFIG_KPROBES enabled two section are getting created which
leads to below build break.
LOG:
AS arch/arm/kernel/entry-armv.o
arch/arm/kernel/entry-armv.S: Assembler messages:
arch/arm/kernel/entry-armv.S:431: Error: symbol ret_from_exception is in a different section
arch/arm/kernel/entry-armv.S:490: Error: symbol ret_from_exception is in a different section
arch/arm/kernel/entry-armv.S:491: Error: symbol __und_usr_unknown is in a different section
This was introduced by commit 4260415f6a3b92c5c986398d96c314df37a4ccbf
Reported-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Upstream PV guests fail to boot because of a NULL pointer in
irq_force_complete_move(). It is possible that xen guests have
irq_desc->chip_data = NULL.
Test for NULL chip_data pointer before attempting to complete an irq move.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
LKML-Reference: <20100427152434.16193.49104.sendpatchset@prarit.bos.redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@kernel.org> [2.6.33]
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