01 May, 2013
3 commits
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The Kconfig help text for MEMORY_NOTIFIER_ERROR_INJECT and
OF_RECONFIG_NOTIFIER_ERROR_INJECT has mismatched module names.Signed-off-by: Akinobu Mita
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The help text for this config is duplicated across the x86, parisc, and
s390 Kconfig.debug files. Arnd Bergman noted that the help text was
slightly misleading and should be fixed to state that enabling this
option isn't a problem when using pre 4.4 gcc.To simplify the rewording, consolidate the text into lib/Kconfig.debug
and modify it there to be more explicit about when you should say N to
this config.Also, make the text a bit more generic by stating that this option
enables compile time checks so we can cover architectures which emit
warnings vs. ones which emit errors. The details of how an
architecture decided to implement the checks isn't as important as the
concept of compile time checking of copy_from_user() calls.While we're doing this, remove all the copy_from_user_overflow() code
that's duplicated many times and place it into lib/ so that any
architecture supporting this option can get the function for free.Signed-off-by: Stephen Boyd
Acked-by: Arnd Bergmann
Acked-by: Ingo Molnar
Acked-by: H. Peter Anvin
Cc: Arjan van de Ven
Acked-by: Helge Deller
Cc: Heiko Carstens
Cc: Stephen Rothwell
Cc: Chris Metcalf
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are several places in kernel where modules unescapes input to convert
C-Style Escape Sequences into byte codes.The patch provides generic implementation of such approach. Test cases are
also included into the patch.[akpm@linux-foundation.org: clarify comment]
[akpm@linux-foundation.org: export get_random_int() to modules]
Signed-off-by: Andy Shevchenko
Cc: Samuel Thibault
Cc: Greg Kroah-Hartman
Cc: Jason Baron
Cc: Alexander Viro
Cc: William Hubbs
Cc: Chris Brannon
Cc: Kirk Reiser
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Mar, 2013
1 commit
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Pull new ImgTec Meta architecture from James Hogan:
"This adds core architecture support for Imagination's Meta processor
cores, followed by some later miscellaneous arch/metag cleanups and
fixes which I kept separate to ease review:- Support for basic Meta 1 (ATP) and Meta 2 (HTP) core architecture
- A few fixes all over, particularly for symbol prefixes
- A few privilege protection fixes
- Several cleanups (setup.c includes, split out a lot of
metag_ksyms.c)
- Fix some missing exports
- Convert hugetlb to use vm_unmapped_area()
- Copy device tree to non-init memory
- Provide dma_get_sgtable()"* tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: (61 commits)
metag: Provide dma_get_sgtable()
metag: prom.h: remove declaration of metag_dt_memblock_reserve()
metag: copy devicetree to non-init memory
metag: cleanup metag_ksyms.c includes
metag: move mm/init.c exports out of metag_ksyms.c
metag: move usercopy.c exports out of metag_ksyms.c
metag: move setup.c exports out of metag_ksyms.c
metag: move kick.c exports out of metag_ksyms.c
metag: move traps.c exports out of metag_ksyms.c
metag: move irq enable out of irqflags.h on SMP
genksyms: fix metag symbol prefix on crc symbols
metag: hugetlb: convert to vm_unmapped_area()
metag: export clear_page and copy_page
metag: export metag_code_cache_flush_all
metag: protect more non-MMU memory regions
metag: make TXPRIVEXT bits explicit
metag: kernel/setup.c: sort includes
perf: Enable building perf tools for Meta
metag: add boot time LNKGET/LNKSET check
metag: add __init to metag_cache_probe()
...
03 Mar, 2013
1 commit
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Add [!]METAG to a couple of Kconfig dependencies in lib/Kconfig.debug.
Don't allow stack utilization instrumentation on metag, and allow
building with frame pointers.Signed-off-by: James Hogan
Cc: Andrew Morton
Cc: "Paul E. McKenney"
Cc: Akinobu Mita
Cc: Michel Lespinasse
Cc: Catalin Marinas
22 Feb, 2013
3 commits
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Merge misc patches from Andrew Morton:
- Florian has vanished so I appear to have become fbdev maintainer
again :(- Joel and Mark are distracted to welcome to the new OCFS2 maintainer
- The backlight queue
- Small core kernel changes
- lib/ updates
- The rtc queue
- Various random bits
* akpm: (164 commits)
rtc: rtc-davinci: use devm_*() functions
rtc: rtc-max8997: use devm_request_threaded_irq()
rtc: rtc-max8907: use devm_request_threaded_irq()
rtc: rtc-da9052: use devm_request_threaded_irq()
rtc: rtc-wm831x: use devm_request_threaded_irq()
rtc: rtc-tps80031: use devm_request_threaded_irq()
rtc: rtc-lp8788: use devm_request_threaded_irq()
rtc: rtc-coh901331: use devm_clk_get()
rtc: rtc-vt8500: use devm_*() functions
rtc: rtc-tps6586x: use devm_request_threaded_irq()
rtc: rtc-imxdi: use devm_clk_get()
rtc: rtc-cmos: use dev_warn()/dev_dbg() instead of printk()/pr_debug()
rtc: rtc-pcf8583: use dev_warn() instead of printk()
rtc: rtc-sun4v: use pr_warn() instead of printk()
rtc: rtc-vr41xx: use dev_info() instead of printk()
rtc: rtc-rs5c313: use pr_err() instead of printk()
rtc: rtc-at91rm9200: use dev_dbg()/dev_err() instead of printk()/pr_debug()
rtc: rtc-rs5c372: use dev_dbg()/dev_warn() instead of printk()/pr_debug()
rtc: rtc-ds2404: use dev_err() instead of printk()
rtc: rtc-efi: use dev_err()/dev_warn()/pr_err() instead of printk()
... -
CONFIG_EXPERT doesn't really make sense, and hides it unintentionally.
Remove superfluous "default n" pointed out by Ingo as well.Signed-off-by: Kyle McMartin
Acked-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Pull driver core patches from Greg Kroah-Hartman:
"Here is the big driver core merge for 3.9-rc1There are two major series here, both of which touch lots of drivers
all over the kernel, and will cause you some merge conflicts:- add a new function called devm_ioremap_resource() to properly be
able to check return values.- remove CONFIG_EXPERIMENTAL
Other than those patches, there's not much here, some minor fixes and
updates"Fix up trivial conflicts
* tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (221 commits)
base: memory: fix soft/hard_offline_page permissions
drivercore: Fix ordering between deferred_probe and exiting initcalls
backlight: fix class_find_device() arguments
TTY: mark tty_get_device call with the proper const values
driver-core: constify data for class_find_device()
firmware: Ignore abort check when no user-helper is used
firmware: Reduce ifdef CONFIG_FW_LOADER_USER_HELPER
firmware: Make user-mode helper optional
firmware: Refactoring for splitting user-mode helper code
Driver core: treat unregistered bus_types as having no devices
watchdog: Convert to devm_ioremap_resource()
thermal: Convert to devm_ioremap_resource()
spi: Convert to devm_ioremap_resource()
power: Convert to devm_ioremap_resource()
mtd: Convert to devm_ioremap_resource()
mmc: Convert to devm_ioremap_resource()
mfd: Convert to devm_ioremap_resource()
media: Convert to devm_ioremap_resource()
iommu: Convert to devm_ioremap_resource()
drm: Convert to devm_ioremap_resource()
...
05 Feb, 2013
1 commit
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…/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney:
1. Changes to rcutorture and to RCU documentation. Posted to LKML at
https://lkml.org/lkml/2013/1/26/188.2. Enhancements to uniprocessor handling in tiny RCU. Posted to LKML
at https://lkml.org/lkml/2013/1/27/2.3. Tag RCU callbacks with grace-period number to simplify callback
advancement. Posted to LKML at https://lkml.org/lkml/2013/1/26/203.4. Miscellaneous fixes. Posted to LKML at https://lkml.org/lkml/2013/1/26/204.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
29 Jan, 2013
2 commits
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…' and 'tiny.2013.01.29b' into HEAD
doctorture.2013.01.11a: Changes to rcutorture and to RCU documentation.
fixes.2013.01.26a: Miscellaneous fixes.
tagcb.2013.01.24a: Tag RCU callbacks with grace-period number to
simplify callback advancement.tiny.2013.01.29b: Enhancements to uniprocessor handling in tiny RCU.
-
Tiny RCU has historically omitted RCU CPU stall warnings in order to
reduce memory requirements, however, lack of these warnings caused
Thomas Gleixner some debugging pain recently. Therefore, this commit
adds RCU CPU stall warnings to tiny RCU if RCU_TRACE=y. This keeps
the memory footprint small, while still enabling CPU stall warnings
in kernels built to enable them.Updated to include Josh Triplett's suggested use of RCU_STALL_COMMON
config variable to simplify #if expressions.Reported-by: Thomas Gleixner
Signed-off-by: Paul E. McKenney
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
27 Jan, 2013
1 commit
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The RCU-related debugging Kconfig options are in two different places,
and consume too much screen real estate. This commit therefore
consolidates them into their own menu.Signed-off-by: Dave Hansen
Signed-off-by: Paul E. McKenney
18 Jan, 2013
1 commit
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The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.CC: Andrew Morton
Acked-by: Paul E. McKenney
CC: Dmitry Kasatkin
CC: James Morris
CC: "Michael S. Tsirkin"
CC: Akinobu Mita
CC: Ingo Molnar
Cc: Greg Kroah-Hartman
Signed-off-by: Kees Cook
Acked-by: Catalin Marinas
Signed-off-by: Greg Kroah-Hartman
09 Jan, 2013
1 commit
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Currently, rcutorture traces every read-side access. This can be
problematic because even a two-minute rcutorture run on a two-CPU system
can generate 28,853,363 reads. Normally, only a failing read is of
interest, so this commit traces adjusts rcutorture's tracing to only
trace failing reads. The resulting event tracing records the time
and the ->completed value captured at the beginning of the RCU read-side
critical section, allowing correlation with other event-tracing messages.Signed-off-by: Paul E. McKenney
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
[ paulmck: Add fix to build problem located by Randy Dunlap based on
diagnosis by Steven Rostedt. ]
04 Jan, 2013
1 commit
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CONFIG_HOTPLUG is going away as an option. As a result, the __dev*
markings need to be removed.This change removes the last of the __dev* markings from the kernel from
a variety of different, tiny, places.Based on patches originally written by Bill Pemberton, but redone by me
in order to handle some of the coding style issues better, by hand.Cc: Bill Pemberton
Signed-off-by: Greg Kroah-Hartman
19 Dec, 2012
1 commit
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Pull powerpc update from Benjamin Herrenschmidt:
"The main highlight is probably some base POWER8 support. There's more
to come such as transactional memory support but that will wait for
the next one.Overall it's pretty quiet, or rather I've been pretty poor at picking
things up from patchwork and reviewing them this time around and Kumar
no better on the FSL side it seems..."* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (73 commits)
powerpc+of: Rename and fix OF reconfig notifier error inject module
powerpc: mpc5200: Add a3m071 board support
powerpc/512x: don't compile any platform DIU code if the DIU is not enabled
powerpc/mpc52xx: use module_platform_driver macro
powerpc+of: Export of_reconfig_notifier_[register,unregister]
powerpc/dma/raidengine: add raidengine device
powerpc/iommu/fsl: Add PAMU bypass enable register to ccsr_guts struct
powerpc/mpc85xx: Change spin table to cached memory
powerpc/fsl-pci: Add PCI controller ATMU PM support
powerpc/86xx: fsl_pcibios_fixup_bus requires CONFIG_PCI
drivers/virt: the Freescale hypervisor driver doesn't need to check MSR[GS]
powerpc/85xx: p1022ds: Use NULL instead of 0 for pointers
powerpc: Disable relocation on exceptions when kexecing
powerpc: Enable relocation on during exceptions at boot
powerpc: Move get_longbusy_msecs into hvcall.h and remove duplicate function
powerpc: Add wrappers to enable/disable relocation on exceptions
powerpc: Add set_mode hcall
powerpc: Setup relocation on exceptions for bare metal systems
powerpc: Move initial mfspr LPCR out of __init_LPCR
powerpc: Add relocation on exception vector handlers
...
14 Dec, 2012
2 commits
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This module used to inject errors in the pSeries specific dynamic
reconfiguration notifiers. Those are gone however, replaced by
generic notifiers for changes to the device-tree. So let's update
the module to deal with these instead and rename it along the way.Signed-off-by: Benjamin Herrenschmidt
Acked-by: Akinobu Mita -
Pull trivial branch from Jiri Kosina:
"Usual stuff -- comment/printk typo fixes, documentation updates, dead
code elimination."* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
HOWTO: fix double words typo
x86 mtrr: fix comment typo in mtrr_bp_init
propagate name change to comments in kernel source
doc: Update the name of profiling based on sysfs
treewide: Fix typos in various drivers
treewide: Fix typos in various Kconfig
wireless: mwifiex: Fix typo in wireless/mwifiex driver
messages: i2o: Fix typo in messages/i2o
scripts/kernel-doc: check that non-void fcts describe their return value
Kernel-doc: Convention: Use a "Return" section to describe return values
radeon: Fix typo and copy/paste error in comments
doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c
various: Fix spelling of "asynchronous" in comments.
Fix misspellings of "whether" in comments.
eisa: Fix spelling of "asynchronous".
various: Fix spelling of "registered" in comments.
doc: fix quite a few typos within Documentation
target: iscsi: fix comment typos in target/iscsi drivers
treewide: fix typo of "suport" in various comments and Kconfig
treewide: fix typo of "suppport" in various comments
...
03 Dec, 2012
1 commit
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Correct spelling typo within various Kconfig.
Signed-off-by: Masanari Iida
Signed-off-by: Jiri Kosina
14 Nov, 2012
1 commit
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The RCU CPU stall warning timeout has defaulted to 60 seconds for
some years, with almost no false positives. This commit therefore
reduces the default to 21 seconds, slightly shorter than the new
soft-lockup timeout.Signed-off-by: Paul E. McKenney
09 Oct, 2012
6 commits
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Add a CONFIG_DEBUG_VM_RB build option for the previously existing
DEBUG_MM_RB code. Now that Andi Kleen modified it to avoid using
recursive algorithms, we can expose it a bit more.Also extend this code to validate_mm() after stack expansion, and to check
that the vma's start and last pgoffs have not changed since the nodes were
inserted on the anon vma interval tree (as it is important that the nodes
be reindexed after each such update).Signed-off-by: Michel Lespinasse
Cc: Andrea Arcangeli
Cc: Rik van Riel
Cc: Peter Zijlstra
Cc: Daniel Santos
Cc: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
After both prio_tree users have been converted to use red-black trees,
there is no need to keep around the prio tree library anymore.Signed-off-by: Michel Lespinasse
Cc: Rik van Riel
Cc: Hillf Danton
Cc: Peter Zijlstra
Cc: Catalin Marinas
Cc: Andrea Arcangeli
Cc: David Woodhouse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Patch 1 implements support for interval trees, on top of the augmented
rbtree API. It also adds synthetic tests to compare the performance of
interval trees vs prio trees. Short answers is that interval trees are
slightly faster (~25%) on insert/erase, and much faster (~2.4 - 3x)
on search. It is debatable how realistic the synthetic test is, and I have
not made such measurements yet, but my impression is that interval trees
would still come out faster.Patch 2 uses a preprocessor template to make the interval tree generic,
and uses it as a replacement for the vma prio_tree.Patch 3 takes the other prio_tree user, kmemleak, and converts it to use
a basic rbtree. We don't actually need the augmented rbtree support here
because the intervals are always non-overlapping.Patch 4 removes the now-unused prio tree library.
Patch 5 proposes an additional optimization to rb_erase_augmented, now
providing it as an inline function so that the augmented callbacks can be
inlined in. This provides an additional 5-10% performance improvement
for the interval tree insert/erase benchmark. There is a maintainance cost
as it exposes augmented rbtree users to some of the rbtree library internals;
however I think this cost shouldn't be too high as I expect the augmented
rbtree will always have much less users than the base rbtree.I should probably add a quick summary of why I think it makes sense to
replace prio trees with augmented rbtree based interval trees now. One of
the drivers is that we need augmented rbtrees for Rik's vma gap finding
code, and once you have them, it just makes sense to use them for interval
trees as well, as this is the simpler and more well known algorithm. prio
trees, in comparison, seem *too* clever: they impose an additional 'heap'
constraint on the tree, which they use to guarantee a faster worst-case
complexity of O(k+log N) for stabbing queries in a well-balanced prio
tree, vs O(k*log N) for interval trees (where k=number of matches,
N=number of intervals). Now this sounds great, but in practice prio trees
don't realize this theorical benefit. First, the additional constraint
makes them harder to update, so that the kernel implementation has to
simplify things by balancing them like a radix tree, which is not always
ideal. Second, the fact that there are both index and heap properties
makes both tree manipulation and search more complex, which results in a
higher multiplicative time constant. As it turns out, the simple interval
tree algorithm ends up running faster than the more clever prio tree.This patch:
Add two test modules:
- prio_tree_test measures the performance of lib/prio_tree.c, both for
insertion/removal and for stabbing searches- interval_tree_test measures the performance of a library of equivalent
functionality, built using the augmented rbtree support.In order to support the second test module, lib/interval_tree.c is
introduced. It is kept separate from the interval_tree_test main file
for two reasons: first we don't want to provide an unfair advantage
over prio_tree_test by having everything in a single compilation unit,
and second there is the possibility that the interval tree functionality
could get some non-test users in kernel over time.Signed-off-by: Michel Lespinasse
Cc: Rik van Riel
Cc: Hillf Danton
Cc: Peter Zijlstra
Cc: Catalin Marinas
Cc: Andrea Arcangeli
Cc: David Woodhouse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This small module helps measure the performance of rbtree insert and
erase.Additionally, we run a few correctness tests to check that the rbtrees
have all desired properties:- contains the right number of nodes in the order desired,
- never two consecutive red nodes on any path,
- all paths to leaf nodes have the same number of black nodes,
- root node is black[akpm@linux-foundation.org: fix printk warning: sparc64 cycles_t is unsigned long]
Signed-off-by: Michel Lespinasse
Cc: Andrea Arcangeli
Acked-by: David Woodhouse
Cc: Rik van Riel
Cc: Peter Zijlstra
Cc: Daniel Santos
Cc: Jens Axboe
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Introduce HAVE_DEBUG_BUGVERBOSE config option and select it in
corresponding architecture Kconfig files. Architectures that already
select GENERIC_BUG don't need to select HAVE_DEBUG_BUGVERBOSE.Signed-off-by: Catalin Marinas
Acked-by: Geert Uytterhoeven
Cc: David Howells
Cc: Hirokazu Takata
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Chris Metcalf
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Introduce HAVE_DEBUG_KMEMLEAK config option and select it in corresponding
architecture Kconfig files. DEBUG_KMEMLEAK now only depends on
HAVE_DEBUG_KMEMLEAK.Signed-off-by: Catalin Marinas
Cc: Russell King
Cc: Michal Simek
Cc: Ralf Baechle
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Martin Schwidefsky
Cc: Heiko Carstens
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Chris Metcalf
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: "H. Peter Anvin"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
06 Oct, 2012
1 commit
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The main option should not appear in the resulting .config when the
dependencies aren't met (i.e. use "depends on" rather than directly
setting the default from the combined dependency values).The sub-options should depend on the main option rather than a more
generic higher level one.Signed-off-by: Jan Beulich
Acked-by: Don Zickus
Cc: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
02 Oct, 2012
1 commit
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Pull arm64 support from Catalin Marinas:
"Linux support for the 64-bit ARM architecture (AArch64)Features currently supported:
- 39-bit address space for user and kernel (each)
- 4KB and 64KB page configurations
- Compat (32-bit) user applications (ARMv7, EABI only)
- Flattened Device Tree (mandated for all AArch64 platforms)
- ARM generic timers"* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (35 commits)
arm64: ptrace: remove obsolete ptrace request numbers from user headers
arm64: Do not set the SMP/nAMP processor bit
arm64: MAINTAINERS update
arm64: Build infrastructure
arm64: Miscellaneous header files
arm64: Generic timers support
arm64: Loadable modules
arm64: Miscellaneous library functions
arm64: Performance counters support
arm64: Add support for /proc/sys/debug/exception-trace
arm64: Debugging support
arm64: Floating point and SIMD
arm64: 32-bit (compat) applications support
arm64: User access library functions
arm64: Signal handling support
arm64: VDSO support
arm64: System calls handling
arm64: ELF definitions
arm64: SMP support
arm64: DMA mapping API
...
23 Sep, 2012
1 commit
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There have been some recent bugs that were triggered only when
preemptible RCU's __rcu_read_unlock() was preempted just after setting
->rcu_read_lock_nesting to INT_MIN, which is a low-probability event.
Therefore, reproducing those bugs (to say nothing of gaining confidence
in alleged fixes) was quite difficult. This commit therefore creates
a new debug-only RCU kernel config option that forces a short delay
in __rcu_read_unlock() to increase the probability of those sorts of
bugs occurring.Signed-off-by: Paul E. McKenney
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
17 Sep, 2012
1 commit
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This patch adds Makefile and Kconfig files required for building an
AArch64 kernel.Signed-off-by: Will Deacon
Signed-off-by: Catalin Marinas
Acked-by: Tony Lindgren
Acked-by: Nicolas Pitre
Acked-by: Olof Johansson
Acked-by: Santosh Shilimkar
Acked-by: Arnd Bergmann
31 Jul, 2012
5 commits
-
This provides the ability to inject artifical errors to pSeries reconfig
notifier chain callbacks. It is controlled through debugfs interface
under /sys/kernel/debug/notifier-error-inject/pSeries-reconfigIf the notifier call chain should be failed with some events
notified, write the error code to "actions//error".Signed-off-by: Akinobu Mita
Cc: Pavel Machek
Cc: "Rafael J. Wysocki"
Cc: Greg KH
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Jones
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This provides the ability to inject artifical errors to memory hotplug
notifier chain callbacks. It is controlled through debugfs interface
under /sys/kernel/debug/notifier-error-inject/memoryIf the notifier call chain should be failed with some events notified,
write the error code to "actions//error".Example: Inject memory hotplug offline error (-12 == -ENOMEM)
# cd /sys/kernel/debug/notifier-error-inject/memory
# echo -12 > actions/MEM_GOING_OFFLINE/error
# echo offline > /sys/devices/system/memory/memoryXXX/state
bash: echo: write error: Cannot allocate memorySigned-off-by: Akinobu Mita
Cc: Pavel Machek
Cc: "Rafael J. Wysocki"
Cc: Greg KH
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Jones
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This provides the ability to inject artifical errors to PM notifier chain
callbacks. It is controlled through debugfs interface under
/sys/kernel/debug/notifier-error-inject/pmEach of the files in "error" directory represents an event which can be
failed and contains the error code. If the notifier call chain should be
failed with some events notified, write the error code to the files.If the notifier call chain should be failed with some events notified,
write the error code to "actions//error".Example: Inject PM suspend error (-12 = -ENOMEM)
# cd /sys/kernel/debug/notifier-error-inject/pm
# echo -12 > actions/PM_SUSPEND_PREPARE/error
# echo mem > /sys/power/state
bash: echo: write error: Cannot allocate memorySigned-off-by: Akinobu Mita
Acked-by: "Rafael J. Wysocki"
Cc: Pavel Machek
Cc: Greg KH
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Jones
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Rewrite existing cpu-notifier-error-inject module to use debugfs based new
framework.This change removes cpu_up_prepare_error and cpu_down_prepare_error module
parameters which were used to specify error code to be injected. We could
keep these module parameters for backward compatibility by module_param_cb
but it seems overkill for this module.This provides the ability to inject artifical errors to CPU notifier chain
callbacks. It is controlled through debugfs interface under
/sys/kernel/debug/notifier-error-inject/cpuIf the notifier call chain should be failed with some events notified,
write the error code to "actions//error".Example1: inject CPU offline error (-1 == -EPERM)
# cd /sys/kernel/debug/notifier-error-inject/cpu
# echo -1 > actions/CPU_DOWN_PREPARE/error
# echo 0 > /sys/devices/system/cpu/cpu1/online
bash: echo: write error: Operation not permittedExample2: inject CPU online error (-2 == -ENOENT)
# cd /sys/kernel/debug/notifier-error-inject/cpu
# echo -2 > actions/CPU_UP_PREPARE/error
# echo 1 > /sys/devices/system/cpu/cpu1/online
bash: echo: write error: No such file or directorySigned-off-by: Akinobu Mita
Cc: Pavel Machek
Cc: "Rafael J. Wysocki"
Cc: Greg KH
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Jones
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patchset provides kernel modules that can be used to test the error
handling of notifier call chain failures by injecting artifical errors to
the following notifier chain callbacks.* CPU notifier
* PM notifier
* memory hotplug notifier
* powerpc pSeries reconfig notifierExample: Inject CPU offline error (-1 == -EPERM)
# cd /sys/kernel/debug/notifier-error-inject/cpu
# echo -1 > actions/CPU_DOWN_PREPARE/error
# echo 0 > /sys/devices/system/cpu/cpu1/online
bash: echo: write error: Operation not permittedThe patchset also adds cpu and memory hotplug tests to
tools/testing/selftests These tests first do simple online and offline
test and then do fault injection tests if notifier error injection
module is available.This patch:
The notifier error injection provides the ability to inject artifical
errors to specified notifier chain callbacks. It is useful to test the
error handling of notifier call chain failures.This adds common basic functions to define which type of events can be
fail and to initialize the debugfs interface to control what error code
should be returned and which event should be failed.Signed-off-by: Akinobu Mita
Cc: Pavel Machek
Cc: "Rafael J. Wysocki"
Cc: Greg KH
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Dave Jones
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Jul, 2012
1 commit
-
Pull misc Itanium fixes from Tony Luck.
* tag 'please-pull-misc-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
debug: Do not permit CONFIG_DEBUG_STACK_USAGE=y on IA64 or PARISC
[IA64] Port OOM changes to ia64_do_page_fault
20 Jul, 2012
1 commit
-
The stack_not_used() function in assumes that stacks
grow downwards. This is not true on IA64 or PARISC, so this function
would walk off in the wrong direction and into the weeds.Found on IA64 because of a compilation failure with recursive dependencies
on IA64_TASKSIZE and IA64_THREAD_INFO_SIZE.Fixing the code is possible, but should be combined with other
infrastructure additions to set up the "canary" at the end of the stack.Reported-by: Fengguang Wu (failed allmodconfig build)
Signed-off-by: Tony Luck
06 Jun, 2012
1 commit
-
Merge two debugging patchlets that were waiting for
preparatory commits to hit upstream.Signed-off-by: Ingo Molnar
24 May, 2012
1 commit
-
…', 'x86-debug-for-linus' and 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull initial trivial x86 stuff from Ingo Molnar.
Various random cleanups and trivial fixes.
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86-64: Eliminate dead ia32 syscall handlers* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/pci-calgary_64.c: Remove obsoleted simple_strtoul() usage
x86: Don't continue booting if we can't load the specified initrd
x86: kernel/dumpstack.c simple_strtoul cleanup
x86: kernel/check.c simple_strtoul cleanup
debug: Add CONFIG_READABLE_ASM
x86: spinlock.h: Remove REG_PTR_MODE* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cache_info: Fix setup of l2/l3 ids* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Avoid double stack traces with show_regs()* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, microcode: microcode_core.c simple_strtoul cleanup
10 May, 2012
1 commit
-
The output of the timestamps got lost with the conversion of the
kmsg buffer to records; restore the old behavior.Document, that CONFIG_PRINTK_TIME now only controls the output of
the timestamps in the syslog() system call and on the console, and
not the recording of the timestamps.Cc: Joe Perches
Cc: Linus Torvalds
Cc: Sasha Levin
Cc: Ingo Molnar
Reported-by: Yinghai Lu
Signed-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
