Since we have at least one user of this function outside of CONFIG_NET
scope, we have to provide this function independently. The proposed
solution is to move it under lib/net_utils.c with corresponding
configuration variable and select wherever it is needed.
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
We have mac_pton() helper to parse MAC addresses.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix to return a negative error code in the clk_get_sys() and clk_enable()
error handling case instead of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Close "fd" file descriptor when is goes out of scope so it does
not leak.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Check return value of strchr call and dereference it only if it is
not NULL.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Check return value of poll call and if it fails print error
to the system log. If errno is EINVAL then exit with non-zero
value otherwise continue the while loop and call poll again.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Check return value of setsockopt call and if it fails print error
to the system log and exit with non-zero value.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In preparation for supporting synthetic Fiber Channel device, add the GUID for
this service.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Starting with Win8, the host supports multiple sub-channels for a given
device. As in the past, the initial channel offer specifies the device and
is associated with both the type and the instance GUIDs. For performance
critical devices, the host may support multiple sub-channels. The sub-channels
share the same type and instance GUID as the primary channel. The number of
sub-channels offerrred to the guest depends on the number of virtual CPUs
assigned to the guest. The guest can request the creation of these sub-channels
and once created and opened, the guest can distribute the traffic across all
the channels (the primary and the sub-channels). A request sent on a sub-channel
will have the response delivered on the same sub-channel.
At channel (sub-channel) creation we bind the channel interrupt to a CPU and
with this sub-channel support we will be able to spread the interrupt load
of a given device across all available CPUs.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch allows the 1-wire bus to autoload the corresponding module
for each slave being attached.
This works similar to bluetooth protocols.
Signed-off-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add the (*probe) function to the platform_driver and use the
module_platform_driver() macro to initialize the module.
Remove the unnecessary __init and __exit tags.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around readl(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around readl(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around readl(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a simple wrapper around writel(), remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The mmio_base is an ioremap'ed memory resource. The normal memory
io functions should be used not the __raw_* versions.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use managed device resources to clean up the probe/remove.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
Cc: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use devm_kzalloc to make cleanup paths simpler
Signed-off-by: Nikolay Balandin <nbalandin@dev.rtsoft.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use devm_kzalloc to make cleanup paths simpler
Signed-off-by: Nikolay Balandin <nbalandin@dev.rtsoft.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
s/regsiter/register/
Use origin comment from the first driver version
which also explain the usage of XHI_MAX_RETRIES better.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use the wrapper functions for getting and setting the driver data using
platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev,
so we can directly pass a struct platform_device.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There is only one device on the platform
drop mei_pdev and the mutex
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mei read always has to be preceded by write but
'write write read read' scenario should work as well.
In this case the offset is not zero but new read should
be initiated
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wd independence is deprecated, remove it.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
do_smart_update_queue() is called when an operation (semop,
semctl(SETVAL), semctl(SETALL), ...) modified the array. It must check
which of the sleeping tasks can proceed.
do_smart_update_queue() missed a few wakeups:
- if a sleeping complex op was completed, then all per-semaphore queues
must be scanned - not only those that were modified by *sops
- if a sleeping simple op proceeded, then the global queue must be
scanned again
And:
- the test for "|sops == NULL) before scanning the global queue is not
required: If the global queue is empty, then it doesn't need to be
scanned - regardless of the reason for calling do_smart_update_queue()
The patch is not optimized, i.e. even completing a wait-for-zero
operation causes a rescan. This is done to keep the patch as simple as
possible.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
- Stable fix to prevent an rpc_task wakeup race
- Fix a NFSv4.1 session drain deadlock
- Fix a NFSv4/v4.1 mount regression when not running rpc.gssd
- Ensure auth_gss pipe detection works in namespaces
- Fix SETCLIENTID fallback if rpcsec_gss is not available
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Merge tag 'nfs-for-3.10-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
- Stable fix to prevent an rpc_task wakeup race
- Fix a NFSv4.1 session drain deadlock
- Fix a NFSv4/v4.1 mount regression when not running rpc.gssd
- Ensure auth_gss pipe detection works in namespaces
- Fix SETCLIENTID fallback if rpcsec_gss is not available
* tag 'nfs-for-3.10-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFS: Fix SETCLIENTID fallback if GSS is not available
SUNRPC: Prevent an rpc_task wakeup race
NFSv4.1 Fix a pNFS session draining deadlock
SUNRPC: Convert auth_gss pipe detection to work in namespaces
SUNRPC: Faster detection if gssd is actually running
SUNRPC: Fix a bug in gss_create_upcall
Pull parisc fixes from Helge Deller:
"This time we made the kernel- and interruption stack allocation
reentrant which fixed some strange kernel crashes (specifically
protection ID traps).
Furthemore this patchset fixes the interrupt stack in UP and SMP
configurations by using native locking instructions. And finally
usage of floating point calculations on parisc were disabled in the
MPILIB."
* 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: fix irq stack on UP and SMP
parisc/superio: Use module_pci_driver to register driver
parisc: make interrupt and interruption stack allocation reentrant
parisc: show number of FPE and unaligned access handler calls in /proc/interrupts
parisc: add additional parisc git tree to MAINTAINERS file
parisc: use PAGE_SHIFT instead of hardcoded value 12 in pacache.S
parisc: add rp5470 entry to machine database
MPILIB: disable usage of floating point registers on parisc
- Fix for corruption with FSX on 512 byte blocksize filesystems
- Fix rounding error in xfs_free_file_space
- Fix use-after-free with extent free intents
- Add several missing KM_NOFS flags to fix lockdep reports
- Several fixes for CRC related code
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Merge tag 'for-linus-v3.10-rc3' of git://oss.sgi.com/xfs/xfs
Pull xfs fixes from Ben Myers:
"Here are fixes for corruption on 512 byte filesystems, a rounding
error, a use-after-free, some flags to fix lockdep reports, and
several fixes related to CRCs. We have a somewhat larger post -rc1
queue than usual due to fixes related to the CRC feature we merged for
3.10:
- Fix for corruption with FSX on 512 byte blocksize filesystems
- Fix rounding error in xfs_free_file_space
- Fix use-after-free with extent free intents
- Add several missing KM_NOFS flags to fix lockdep reports
- Several fixes for CRC related code"
* tag 'for-linus-v3.10-rc3' of git://oss.sgi.com/xfs/xfs:
xfs: remote attribute lookups require the value length
xfs: xfs_attr_shortform_allfit() does not handle attr3 format.
xfs: xfs_da3_node_read_verify() doesn't handle XFS_ATTR3_LEAF_MAGIC
xfs: fix missing KM_NOFS tags to keep lockdep happy
xfs: Don't reference the EFI after it is freed
xfs: fix rounding in xfs_free_file_space
xfs: fix sub-page blocksize data integrity writes
- Additional CPU ID for the intel_pstate driver from Dirk Brandewie.
- More cpufreq fixes related to ARM big.LITTLE support and locking from
Viresh Kumar.
- VIA C7 cpufreq build fix from Rafał Bilski.
- ACPI power management fix making it possible to use device power
states regardless of the CONFIG_PM setting from Rafael J. Wysocki.
- New ACPI video blacklist item from Bastian Triller.
/
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Merge tag 'pm+acpi-3.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management and ACPI fixes from Rafael Wysocki:
- Additional CPU ID for the intel_pstate driver from Dirk Brandewie.
- More cpufreq fixes related to ARM big.LITTLE support and locking from
Viresh Kumar.
- VIA C7 cpufreq build fix from Rafał Bilski.
- ACPI power management fix making it possible to use device power
states regardless of the CONFIG_PM setting from Rafael J Wysocki.
- New ACPI video blacklist item from Bastian Triller.
* tag 'pm+acpi-3.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / video: Add "Asus UL30A" to ACPI video detect blacklist
cpufreq: arm_big_little_dt: Instantiate as platform_driver
cpufreq: arm_big_little_dt: Register driver only if DT has valid data
cpufreq / e_powersaver: Fix linker error when ACPI processor is a module
cpufreq / intel_pstate: Add additional supported CPU ID
cpufreq: Drop rwsem lock around CPUFREQ_GOV_POLICY_EXIT
ACPI / PM: Allow device power states to be used for CONFIG_PM unset
Pull slave-dma fixes from Vinod Koul:
"We have two patches from Andy & Rafael fixing the Lynxpoint dma"
* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
ACPI / LPSS: register clock device for Lynxpoint DMA properly
dma: acpi-dma: parse CSRT to extract additional resources
kcore_vmalloc is in fs/proc/kcore.c and kcore_mem is unused across
the tree. Noticed while grepping the tree for some other kcore stuff.
(score looks pretty unmaintained to me.)
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Fallouts/wreckage of Cache Flush optimizations / aliasing dcache support
* Fix for an interesting bug where piped input to grep was getting
mysteriously clobbered
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Merge tag 'arc-v3.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC fixes from Vineet Gupta:
- Fallouts/wreckage of Cache Flush optimizations / aliasing dcache
support
- Fix for an interesting bug where piped input to grep was getting
mysteriously clobbered
* tag 'arc-v3.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
ARC: lazy dcache flush broke gdb in non-aliasing configs
ARC: Use enough bits for determining page's cache color
ARC: Brown paper bag bug in macro for checking cache color
ARC: copy_(to|from)_user() to honor usermode-access permissions
ARC: [mm] Prevent stray dcache lines after__sync_icache_dcach()
ARC: [TB10x] Remove redundant abilis,simple-pinctrl mechanism
Pull ARM fixes from Russell King:
"Just three this time, all really quite small"
* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported
ARM: 7727/1: remove the .vm_mm value from gate_vma
ARM: 7723/1: crypto: sha1-armv4-large.S: fix SP handling
gdbserver inserting a breakpoint ends up calling copy_user_page() for a
code page. The generic version of which (non-aliasing config) didn't set
the PG_arch_1 bit hence update_mmu_cache() didn't sync dcache/icache for
corresponding dynamic loader code page - causing garbade to be executed.
So now aliasing versions of copy_user_highpage()/clear_page() are made
default. There is no significant overhead since all of special alias
handling code is compiled out for non-aliasing build
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Merge fixes from Andrew Morton:
"A bunch of fixes and one simple fbdev driver which missed the merge
window because people will still talking about it (to no great
effect)."
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (30 commits)
aio: fix kioctx not being freed after cancellation at exit time
mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas
drivers/rtc/rtc-max8998.c: check for pdata presence before dereferencing
ocfs2: goto out_unlock if ocfs2_get_clusters_nocache() failed in ocfs2_fiemap()
random: fix accounting race condition with lockless irq entropy_count update
drivers/char/random.c: fix priming of last_data
mm/memory_hotplug.c: fix printk format warnings
nilfs2: fix issue of nilfs_set_page_dirty() for page at EOF boundary
drivers/block/brd.c: fix brd_lookup_page() race
fbdev: FB_GOLDFISH should depend on HAS_DMA
drivers/rtc/rtc-pl031.c: pass correct pointer to free_irq()
auditfilter.c: fix kernel-doc warnings
aio: fix io_getevents documentation
revert "selftest: add simple test for soft-dirty bit"
drivers/leds/leds-ot200.c: fix error caused by shifted mask
mm/THP: use pmd_populate() to update the pmd with pgtable_t pointer
linux/kernel.h: fix kernel-doc warning
mm compaction: fix of improper cache flush in migration code
rapidio/tsi721: fix bug in MSI interrupt handling
hfs: avoid crash in hfs_bnode_create
...
We didn't have any fixes sent up for -rc2, so this is a slightly larger
batch. A bit all over the place platform-wise; OMAP, at91, marvell,
renesas, sunxi, ux500, etc.
I tried to summarize highlights but there isn't a whole lot to point
out. Lots of little things fixed all over. A couple of defconfig updates
due to new/changing options.
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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:
"We didn't have any fixes sent up for -rc2, so this is a slightly
larger batch. A bit all over the place platform-wise; OMAP, at91,
marvell, renesas, sunxi, ux500, etc.
I tried to summarize highlights but there isn't a whole lot to point
out. Lots of little things fixed all over. A couple of defconfig
updates due to new/changing options."
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (44 commits)
ARM: at91/sama5: fix incorrect PMC pcr div definition
ARM: at91/dt: fix macb pinctrl_macb_rmii_mii_alt definition
ARM: at91: at91sam9n12: move external irq declatation to DT
ARM: shmobile: marzen: Use error values in usb_power_*
ARM: tegra: defconfig fixes
ARM: nomadik: fix IRQ assignment for SMC ethernet
ARM: vt8500: Add missing NULL terminator in dt_compat
clk: tegra: add ac97 controller clock
clk: tegra: remove USB from clk init table
ARM: dts: mvebu: Fix wrong the address reg value for the L2-cache node
ARM: plat-orion: Fix num_resources and id for ge10 and ge11
ARM: OMAP2+: hwmod: Remove sysc slave idle and auto idle apis
SERIAL: OMAP: Remove the slave idle handling from the driver
ARM: OMAP2+: serial: Remove the un-used slave idle hooks
ARM: OMAP2+: hwmod-data: UART IP needs software control to manage sidle modes
ARM: OMAP2+: hwmod: Add a new flag to handle SIDLE in SWSUP only in active
ARM: OMAP2+: hwmod: Fix sidle programming in _enable_sysc()/_idle_sysc()
arm: mvebu: fix the 'ranges' property to handle PCIe
ARM: mvebu: select ARCH_REQUIRE_GPIOLIB for mvebu platform
ARM: AM33XX: Add missing .clkdm_name to clkdiv32k_ick clock
...
The recent changes overhauling fs/aio.c introduced a bug that results in
the kioctx not being freed when outstanding kiocbs are cancelled at
exit_aio() time. Specifically, a kiocb that is cancelled has its
completion events discarded by batch_complete_aio(), which then fails to
wake up the process stuck in free_ioctx(). Fix this by modifying the
wait_event() condition in free_ioctx() appropriately.
This patch was tested with the cancel operation in the thread based code
posted yesterday.
[akpm@linux-foundation.org: fix build]
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Zach Brown <zab@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
A panic can be caused by simply cat'ing /proc/<pid>/smaps while an
application has a VM_PFNMAP range. It happened in-house when a
benchmarker was trying to decipher the memory layout of his program.
/proc/<pid>/smaps and similar walks through a user page table should not
be looking at VM_PFNMAP areas.
Certain tests in walk_page_range() (specifically split_huge_page_pmd())
assume that all the mapped PFN's are backed with page structures. And
this is not usually true for VM_PFNMAP areas. This can result in panics
on kernel page faults when attempting to address those page structures.
There are a half dozen callers of walk_page_range() that walk through a
task's entire page table (as N. Horiguchi pointed out). So rather than
change all of them, this patch changes just walk_page_range() to ignore
VM_PFNMAP areas.
The logic of hugetlb_vma() is moved back into walk_page_range(), as we
want to test any vma in the range.
VM_PFNMAP areas are used by:
- graphics memory manager gpu/drm/drm_gem.c
- global reference unit sgi-gru/grufile.c
- sgi special memory char/mspec.c
- and probably several out-of-tree modules
[akpm@linux-foundation.org: remove now-unused hugetlb_vma() stub]
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Sterba <dsterba@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
