Maintaining the current CFI annotations written in R'lyehian is
difficult for most of us. Translate them to something a little
closer to English.
This will remove the CFI data for kernels built with extremely
old versions of binutils. I think this is a fair tradeoff for
the ability for mortals to edit the asm.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/ae3ff4ff5278b4bfc1e1dab368823469866d4b71.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
For the vDSO, user code wants runtime unwind info. Make sure
that, if we use .cfi directives, we generate it.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/16e29ad8855e6508197000d8c41f56adb00d7580.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Commit:
131484c8da ("x86/debug: Remove perpetually broken, unmaintainable dwarf annotations")
removed all the manual DWARF annotations outside the vDSO. It also removed
the macros we used for the manual annotations.
Re-add these macros so that we can clean up the vDSO annotations.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/4c70bb98a8b773c8ccfaabf6745e569ff43e7f65.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
32-bit userspace will now always see the same vDSO, which is
exactly what used to be the int80 vDSO. Subsequent patches will
clean it up and make it support SYSENTER and SYSCALL using
alternatives.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/e7e6b3526fa442502e6125fe69486aab50813c32.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
We eventually want to make it all the way into C code before
enabling interrupts. We need to rework our flags handling
slightly to delay enabling interrupts.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/35d24d2a9305da3182eab7b2cdfd32902e90962c.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Rather than worrying about exactly where LOCKDEP_SYS_EXIT should
go in the asm code, add it to prepare_exit_from_usermode() and
remove all of the asm calls that are followed by
prepare_exit_to_usermode().
LOCKDEP_SYS_EXIT now appears only in the syscall fast paths.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1736ebe948b845e68120b86b89091f3ec27f5e8e.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Clearing NT is part of the prologue, whereas loading up arg6
makes more sense to think about as part of syscall processing.
Reorder them.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/19eb235828b2d2a52c53459e09f2974e15e65a35.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This tests assumptions about how fast syscall works wrt pt_regs
and, in particular, what happens if IP is decremented by 2
during a syscall.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1c44dbfe59000ba135bbf35ccc5d2433a0b31618.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
While the kernel itself doesn't use DWARF unwinding, user code
expects to be able to unwind the vDSO. The vsyscall
(AT_SYSINFO) entry is manually CFI-annotated, and this tests
that it unwinds correctly.
I tested the test by incorrectly annotating __kernel_vsyscall,
and the test indeed fails if I do that.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/8bf736d1925cdd165c0f980156a4248e55af47a1.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This should improve code quality a bit. It also shrinks the kernel text:
Before:
text data bss dec filename
21828379 5194760 1277952 28301091 vmlinux
After:
text data bss dec filename
21827997 5194760 1277952 28300709 vmlinux
... by 382 bytes.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/f427b8002d932e5deab9055e0074bb4e7e80ee39.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
GCC doesn't realize that get_user(), put_user(), and their __
variants are unlikely to fail. Tell it.
I noticed this while playing with the C entry code.
Before:
text data bss dec filename
21828763 5194760 1277952 28301475 vmlinux.baseline
After:
text data bss dec filename
21828379 5194760 1277952 28301091 vmlinux.new
The generated code shrunk by 384 bytes.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/dc37bed7024319c3004d950d57151fca6aeacf97.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Highlights include:
Bugfixes:
- Fix a use-after-free bug in the RPC/RDMA client
- Fix a write performance regression
- Fix up page writeback accounting
- Don't try to reclaim unused state owners
- Fix a NFSv4 nograce recovery hang
- reset states to use open_stateid when returning delegation voluntarily
- Fix a tracepoint NULL-pointer dereference
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Merge tag 'nfs-for-4.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
"Highlights include:
Bugfixes:
- Fix a use-after-free bug in the RPC/RDMA client
- Fix a write performance regression
- Fix up page writeback accounting
- Don't try to reclaim unused state owners
- Fix a NFSv4 nograce recovery hang
- reset states to use open_stateid when returning delegation
voluntarily
- Fix a tracepoint NULL-pointer dereference"
* tag 'nfs-for-4.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFS: Fix a tracepoint NULL-pointer dereference
nfs4: reset states to use open_stateid when returning delegation voluntarily
NFSv4: Fix a nograce recovery hang
NFSv4.1: nfs4_opendata_check_deleg needs to handle NFS4_OPEN_CLAIM_DELEG_CUR_FH
NFSv4: Don't try to reclaim unused state owners
NFS: Fix a write performance regression
NFS: Fix up page writeback accounting
xprtrdma: disconnect and flush cqs before freeing buffers
This reverts commit 998ef75ddb.
The commit itself does not appear to be buggy per se, but it is exposing
a bug in ext4 (and Ted thinks ext3 too, but we solved that by getting
rid of it). It's too late in the release cycle to really worry about
this, even if Dave Hansen has a patch that may actually fix the
underlying ext4 problem. We can (and should) revisit this for the next
release.
The problem is that moving the prefaulting later now exposes a special
case with partially successful writes that isn't handled correctly. And
the prefaulting likely isn't normally even that much of a performance
issue - it looks like at least one reason Dave saw this in his
performance tests is that he also ran them on Skylake that now supports
the new SMAP code, which makes the normally very cheap user space
prefaulting noticeably more expensive.
Bisected-and-acked-by: Ted Ts'o <tytso@mit.edu>
Analyzed-and-acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Running xfstest generic/013 with the tracepoint nfs:nfs4_open_file
enabled produces a NULL-pointer dereference when calculating fileid and
filehandle of the opened file. Fix this by checking if state is NULL
before trying to use the inode pointer.
Reported-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
- Fix VM save performance regression with x86 PV guests.
- Make kexec work in x86 PVHVM guests (if Xen has the soft-reset ABI).
- Other minor fixes.
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Merge tag 'for-linus-4.3b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen bug fixes from David Vrabel:
- Fix VM save performance regression with x86 PV guests
- Make kexec work in x86 PVHVM guests (if Xen has the soft-reset ABI)
- Other minor fixes.
* tag 'for-linus-4.3b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/xen/p2m: hint at the last populated P2M entry
x86/xen: Do not clip xen_e820_map to xen_e820_map_entries when sanitizing map
x86/xen: Support kexec/kdump in HVM guests by doing a soft reset
xen/x86: Don't try to write syscall-related MSRs for PV guests
xen: use correct type for HYPERVISOR_memory_op()
Pull s390 fixes from Martin Schwidefsky:
"Three bug fixes and an update to the default configuration"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/defconfig: set SCSI_DH=y
s390/vtime: correct scaled cputime of partially idle CPUs
s390/boot/decompression: disable floating point in decompressor
s390/numa: use correct type for node_to_cpumask_map
Pull CIFS fixes from Steve French:
"Two fixes for problems pointed out by automated tools.
Thanks PaX/grsecurity team and Dan Carpenter (and the Smatch tool)"
* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
[CIFS] Update cifs version number
[SMB3] Do not fall back to SMBWriteX in set_file_size error cases
[SMB3] Missing null tcon check
With commit 633d6f17cd (x86/xen: prepare
p2m list for memory hotplug) the P2M may be sized to accomdate a much
larger amount of memory than the domain currently has.
When saving a domain, the toolstack must scan all the P2M looking for
populated pages. This results in a performance regression due to the
unnecessary scanning.
Instead of reporting (via shared_info) the maximum possible size of
the P2M, hint at the last PFN which might be populated. This hint is
increased as new leaves are added to the P2M (in the expectation that
they will be used for populated entries).
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: <stable@vger.kernel.org> # 4.0+
Pull strscpy string copy function implementation from Chris Metcalf.
Chris sent this during the merge window, but I waffled back and forth on
the pull request, which is why it's going in only now.
The new "strscpy()" function is definitely easier to use and more secure
than either strncpy() or strlcpy(), both of which are horrible nasty
interfaces that have serious and irredeemable problems.
strncpy() has a useless return value, and doesn't NUL-terminate an
overlong result. To make matters worse, it pads a short result with
zeroes, which is a performance disaster if you have big buffers.
strlcpy(), by contrast, is a mis-designed "fix" for strlcpy(), lacking
the insane NUL padding, but having a differently broken return value
which returns the original length of the source string. Which means
that it will read characters past the count from the source buffer, and
you have to trust the source to be properly terminated. It also makes
error handling fragile, since the test for overflow is unnecessarily
subtle.
strscpy() avoids both these problems, guaranteeing the NUL termination
(but not excessive padding) if the destination size wasn't zero, and
making the overflow condition very obvious by returning -E2BIG. It also
doesn't read past the size of the source, and can thus be used for
untrusted source data too.
So why did I waffle about this for so long?
Every time we introduce a new-and-improved interface, people start doing
these interminable series of trivial conversion patches.
And every time that happens, somebody does some silly mistake, and the
conversion patch to the improved interface actually makes things worse.
Because the patch is mindnumbing and trivial, nobody has the attention
span to look at it carefully, and it's usually done over large swatches
of source code which means that not every conversion gets tested.
So I'm pulling the strscpy() support because it *is* a better interface.
But I will refuse to pull mindless conversion patches. Use this in
places where it makes sense, but don't do trivial patches to fix things
that aren't actually known to be broken.
* 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: use global strscpy() rather than private copy
string: provide strscpy()
Make asm/word-at-a-time.h available on all architectures
Two tagged for -stable
One is really a cleanup to match and improve kmemcache interface.
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Merge tag 'md/4.3-fixes' of git://neil.brown.name/md
Pull md fixes from Neil Brown:
"Assorted fixes for md in 4.3-rc.
Two tagged for -stable, and one is really a cleanup to match and
improve kmemcache interface.
* tag 'md/4.3-fixes' of git://neil.brown.name/md:
md/bitmap: don't pass -1 to bitmap_storage_alloc.
md/raid1: Avoid raid1 resync getting stuck
md: drop null test before destroy functions
md: clear CHANGE_PENDING in readonly array
md/raid0: apply base queue limits *before* disk_stack_limits
md/raid5: don't index beyond end of array in need_this_block().
raid5: update analysis state for failed stripe
md: wait for pending superblock updates before switching to read-only
Pull MIPS updates from Ralf Baechle:
"This week's round of MIPS fixes:
- Fix JZ4740 build
- Fix fallback to GFP_DMA
- FP seccomp in case of ENOSYS
- Fix bootmem panic
- A number of FP and CPS fixes
- Wire up new syscalls
- Make sure BPF assembler objects can properly be disassembled
- Fix BPF assembler code for MIPS I"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: scall: Always run the seccomp syscall filters
MIPS: Octeon: Fix kernel panic on startup from memory corruption
MIPS: Fix R2300 FP context switch handling
MIPS: Fix octeon FP context switch handling
MIPS: BPF: Fix load delay slots.
MIPS: BPF: Do all exports of symbols with FEXPORT().
MIPS: Fix the build on jz4740 after removing the custom gpio.h
MIPS: CPS: #ifdef on CONFIG_MIPS_MT_SMP rather than CONFIG_MIPS_MT
MIPS: CPS: Don't include MT code in non-MT kernels.
MIPS: CPS: Stop dangling delay slot from has_mt.
MIPS: dma-default: Fix 32-bit fall back to GFP_DMA
MIPS: Wire up userfaultfd and membarrier syscalls.
Pull irq fixes from Thomas Gleixner:
"This update contains:
- Fix for a long standing race affecting /proc/irq/NNN
- One line fix for ARM GICV3-ITS counting the wrong data
- Warning silencing in ARM GICV3-ITS. Another GCC trying to be
overly clever issue"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/gic-v3-its: Count additional LPIs for the aliased devices
irqchip/gic-v3-its: Silence warning when its_lpi_alloc_chunks gets inlined
genirq: Fix race in register_irq_proc()
The MIPS syscall handler code used to return -ENOSYS on invalid
syscalls. Whilst this is expected, it caused problems for seccomp
filters because the said filters never had the change to run since
the code returned -ENOSYS before triggering them. This caused
problems on the chromium testsuite for filters looking for invalid
syscalls. This has now changed and the seccomp filters are always
run even if the syscall is invalid. We return -ENOSYS once we
return from the seccomp filters. Moreover, similar codepaths have
been merged in the process which simplifies somewhat the overall
syscall code.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11236/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Pull x86 fixes from Ingo Molnar:
"Fixes all around the map: W+X kernel mapping fix, WCHAN fixes, two
build failure fixes for corner case configs, x32 header fix and a
speling fix"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/headers/uapi: Fix __BITS_PER_LONG value for x32 builds
x86/mm: Set NX on gap between __ex_table and rodata
x86/kexec: Fix kexec crash in syscall kexec_file_load()
x86/process: Unify 32bit and 64bit implementations of get_wchan()
x86/process: Add proper bound checks in 64bit get_wchan()
x86, efi, kasan: Fix build failure on !KASAN && KMEMCHECK=y kernels
x86/hyperv: Fix the build in the !CONFIG_KEXEC_CORE case
x86/cpufeatures: Correct spelling of the HWP_NOTIFY flag
Pull EFI fixes from Ingo Molnar:
"Two EFI fixes: one for x86, one for ARM, fixing a boot crash bug that
can trigger under newer EFI firmware"
* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
arm64/efi: Fix boot crash by not padding between EFI_MEMORY_RUNTIME regions
x86/efi: Fix boot crash by mapping EFI memmap entries bottom-up at runtime, instead of top-down
Pull drm fixes from Dave Airlie:
"Bunch of fixes all over the place, all pretty small: amdgpu, i915,
exynos, one qxl and one vmwgfx.
There is also a bunch of mst fixes, I left some cleanups in the series
as I didn't think it was worth splitting up the tested series"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (37 commits)
drm/dp/mst: add some defines for logical/physical ports
drm/dp/mst: drop cancel work sync in the mstb destroy path (v2)
drm/dp/mst: split connector registration into two parts (v2)
drm/dp/mst: update the link_address_sent before sending the link address (v3)
drm/dp/mst: fixup handling hotplug on port removal.
drm/dp/mst: don't pass port into the path builder function
drm/radeon: drop radeon_fb_helper_set_par
drm: handle cursor_set2 in restore_fbdev_mode
drm/exynos: Staticize local function in exynos_drm_gem.c
drm/exynos: fimd: actually disable dp clock
drm/exynos: dp: remove suspend/resume functions
drm/qxl: recreate the primary surface when the bo is not primary
drm/amdgpu: only print meaningful VM faults
drm/amdgpu/cgs: remove import_gpu_mem
drm/i915: Call non-locking version of drm_kms_helper_poll_enable(), v2
drm: Add a non-locking version of drm_kms_helper_poll_enable(), v2
drm/vmwgfx: Fix a command submission hang regression
drm/exynos: remove unused mode_fixup() code
drm/exynos: remove decon_mode_fixup()
drm/exynos: remove fimd_mode_fixup()
...
Pull input layer fixes from Dmitry Torokhov:
"Fixes for two recent regressions (in Synaptics PS/2 and uinput
drivers) and some more driver fixups"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Revert "Input: synaptics - fix handling of disabling gesture mode"
Input: psmouse - fix data race in __ps2_command
Input: elan_i2c - add all valid ic type for i2c/smbus
Input: zhenhua - ensure we have BITREVERSE
Input: omap4-keypad - fix memory leak
Input: serio - fix blocking of parport
Input: uinput - fix crash when using ABS events
Input: elan_i2c - expand maximum product_id form 0xFF to 0xFFFF
Input: elan_i2c - add ic type 0x03
Input: elan_i2c - don't require known iap version
Input: imx6ul_tsc - fix controller name
Input: imx6ul_tsc - use the preferred method for kzalloc()
Input: imx6ul_tsc - check for negative return value
Input: imx6ul_tsc - propagate the errors
Input: walkera0701 - fix abs() calculations on 64 bit values
Input: mms114 - remove unneded semicolons
Input: pm8941-pwrkey - remove unneded semicolon
Input: fix typo in MT documentation
Input: cyapa - fix address of Gen3 devices in device tree documentation
This patch fixes one cases where abs() was being used with 64-bit
nanosecond values, where the result may be capped at 32-bits.
This potentially could cause watchdog false negatives on 32-bit
systems, so this patch addresses the issue by using abs64().
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1442279124-7309-2-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
When the client goes to return a delegation, it should always update any
nfs4_state currently set up to use that delegation stateid to instead
use the open stateid. It already does do this in some cases,
particularly in the state recovery code, but not currently when the
delegation is voluntarily returned (e.g. in advance of a RENAME). This
causes the client to try to continue using the delegation stateid after
the DELEGRETURN, e.g. in LAYOUTGET.
Set the nfs4_state back to using the open stateid in
nfs4_open_delegation_recall, just before clearing the
NFS_DELEGATED_STATE bit.
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Since commit 5cae02f427 an OPEN_CONFIRM should
have a privileged sequence in the recovery case to allow nograce recovery to
proceed for NFSv4.0.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
We need to warn against broken NFSv4.1 servers that try to hand out
delegations in response to NFS4_OPEN_CLAIM_DELEG_CUR_FH.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Currently, we don't test if the state owner is in use before we try to
recover it. The problem is that if the refcount is zero, then the
state owner will be waiting on the lru list for garbage collection.
The expectation in that case is that if you bump the refcount, then
you must also remove the state owner from the lru list. Otherwise
the call to nfs4_put_state_owner will corrupt that list by trying
to add our state owner a second time.
Avoid the whole problem by just skipping state owners that hold no
state.
Reported-by: Andrew W Elble <aweits@rit.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
If all other conditions in nfs_can_extend_write() are met, and there
are no locks, then we should be able to assume close-to-open semantics
and the ability to extend our write to cover the whole page.
With this patch, the xfstests generic/074 test completes in 242s instead
of >1400s on my test rig.
Fixes: bd61e0a9c8 ("locks: convert posix locks to file_lock_context")
Cc: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Currently, we are crediting all the calls to nfs_writepages_callback()
(i.e. the nfs_writepages() callback) to nfs_writepage(). Aside from
being inconsistent with the behaviour of the equivalent readpage/readpages
accounting, this also means that we cannot distinguish between bulk writes
and single page writebacks (which confuses the 'nfsiostat -p' tool).
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
inadvertently changing a huge pmd page into a pmd table entry.
- Function graph tracer panic fix caused by the return_to_handler code
corrupting the multi-regs function return value (composite types).
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
- Fix for transparent huge page change_protection() logic which was
inadvertently changing a huge pmd page into a pmd table entry.
- Function graph tracer panic fix caused by the return_to_handler code
corrupting the multi-regs function return value (composite types).
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: ftrace: fix function_graph tracer panic
arm64: Fix THP protection change logic
Pull m68k updates from Geert Uytterhoeven:
"Summary:
- Fix for accidental modification of arguments of syscall functions
- Wire up new syscalls
- Update defconfigs"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
m68k/defconfig: Update defconfigs for v4.3-rc1
m68k: Define asmlinkage_protect
m68k: Wire up membarrier
m68k: Wire up userfaultfd
m68k: Wire up direct socket calls
When configuring the interrupt mapping for a new device, we
iterate over all the possible aliases to account for their
maximum MSI allocation. This was introduced by e8137f4f50
("irqchip: gicv3-its: Iterate over PCI aliases to generate ITS configuration").
Turns out that the code doing that is a bit braindead, and repeatedly
accounts for the same device over and over.
Fix this by counting the actual alias that is passed to us by the
core code.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1443800646-8074-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
More agressive inlining in recent versions of GCC have uncovered
a new set of warnings:
drivers/irqchip/irq-gic-v3-its.c: In function its_msi_prepare:
drivers/irqchip/irq-gic-v3-its.c:1148:26: warning: lpi_base may be used
uninitialized in this function [-Wmaybe-uninitialized]
dev->event_map.lpi_base = lpi_base;
^
drivers/irqchip/irq-gic-v3-its.c:1116:6: note: lpi_base was declared here
int lpi_base;
^
drivers/irqchip/irq-gic-v3-its.c:1149:25: warning: nr_lpis may be used
uninitialized in this function [-Wmaybe-uninitialized]
dev->event_map.nr_lpis = nr_lpis;
^
drivers/irqchip/irq-gic-v3-its.c:1117:6: note: nr_lpis was declared here
int nr_lpis;
^
The warning is fairly benign (there is no code path that could
actually use uninitialized variables), but let's silence it anyway
by zeroing the variables on the error path.
Reported-by: Alex Shi <alex.shi@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1443800646-8074-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This contains fixes spread throughout the drivers
Also fixes one more instance of privatecnt in dmaengine
bunch of pxa_dma fixes for reuse of descriptor issue, residue and
no-requestor
odd fixes in xgene, idma, sun4i and zxdma
at_xdmac fixes for cleaning descriptor and block addr mode
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Merge tag 'dmaengine-fix-4.3-rc4' of git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine fixes from Vinod Koul:
"This contains fixes spread throughout the drivers, and also fixes one
more instance of privatecnt in dmaengine.
Driver fixes summary:
- bunch of pxa_dma fixes for reuse of descriptor issue, residue and
no-requestor
- odd fixes in xgene, idma, sun4i and zxdma
- at_xdmac fixes for cleaning descriptor and block addr mode"
* tag 'dmaengine-fix-4.3-rc4' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: pxa_dma: fix residue corner case
dmaengine: pxa_dma: fix the no-requestor case
dmaengine: zxdma: Fix off-by-one for testing valid pchan request
dmaengine: at_xdmac: clean used descriptor
dmaengine: at_xdmac: change block increment addressing mode
dmaengine: dw: properly read DWC_PARAMS register
dmaengine: xgene-dma: Fix overwritting DMA tx ring
dmaengine: fix balance of privatecnt
dmaengine: sun4i: fix unsafe list iteration
dmaengine: idma64: improve residue estimation
dmaengine: xgene-dma: fix handling xgene_dma_get_ring_size result
dmaengine: pxa_dma: fix initial list move
Pull block fixes from Jens Axboe:
"Another week, another round of fixes.
These have been brewing for a bit and in various iterations, but I
feel pretty comfortable about the quality of them. They fix real
issues. The pull request is mostly blk-mq related, and the only one
not fixing a real bug, is the tag iterator abstraction from Christoph.
But it's pretty trivial, and we'll need it for another fix soon.
Apart from the blk-mq fixes, there's an NVMe affinity fix from Keith,
and a single fix for xen-blkback from Roger fixing failure to free
requests on disconnect"
* 'for-linus' of git://git.kernel.dk/linux-block:
blk-mq: factor out a helper to iterate all tags for a request_queue
blk-mq: fix racy updates of rq->errors
blk-mq: fix deadlock when reading cpu_list
blk-mq: avoid inserting requests before establishing new mapping
blk-mq: fix q->mq_usage_counter access race
blk-mq: Fix use after of free q->mq_map
blk-mq: fix sysfs registration/unregistration race
blk-mq: avoid setting hctx->tags->cpumask before allocation
NVMe: Set affinity after allocating request queues
xen/blkback: free requests on disconnection
This reverts commit e51e38494a: we
actually do want the device to work in extended W mode, as this is the
mode that allows us receiving multiple contact information.
Cc: stable@vger.kernel.org
During development it was found that a number of builds would panic
during the kernel init process, more specifically in 'delayed_fput()'.
The panic showed the kernel trying to access a memory address of
'0xb7fdc00' while traversing the 'delayed_fput_list' structure.
Comparing this memory address to the value of the pointer used on
builds that did not panic confirmed that the pointer on crashing
builds must have been corrupted at some stage earlier in the init
process.
By traversing the list earlier and earlier in the code it was found
that 'plat_mem_setup()' was responsible for corrupting the list.
Specifically the line:
memory = cvmx_bootmem_phy_alloc(mem_alloc_size,
__pa_symbol(&__init_end), -1,
0x100000,
CVMX_BOOTMEM_FLAG_NO_LOCKING);
Which would eventually call:
cvmx_bootmem_phy_set_size(new_ent_addr,
cvmx_bootmem_phy_get_size
(ent_addr) -
(desired_min_addr -
ent_addr));
Where 'new_ent_addr'=0x4800000 (the address of 'delayed_fput_list')
and the second argument (size)=0xb7fdc00 (the address causing the
kernel panic). The job of this part of 'plat_mem_setup()' is to
allocate chunks of memory for the kernel to use. At the start of
each chunk of memory the size of the chunk is written, hence the
value 0xb7fdc00 is written onto memory at 0x4800000, therefore the
kernel panics when it goes back to access 'delayed_fput_list' later
on in the initialisation process.
On builds that were not crashing it was found that the compiler had
placed 'delayed_fput_list' at 0x4800008, meaning it wasn't corrupted
(but something else in memory was overwritten).
As can be seen in the first function call above the code begins to
allocate chunks of memory beginning from the symbol '__init_end'.
The MIPS linker script (vmlinux.lds.S) however defines the .bss
section to begin after '__init_end'. Therefore memory within the
.bss section is allocated to the kernel to use (System.map shows
'delayed_fput_list' and other kernel structures to be in .bss).
To stop the kernel panic (and the .bss section being corrupted)
memory should begin being allocated from the symbol '_end'.
Signed-off-by: Matt Bennett <matt.bennett@alliedtelesis.co.nz>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: aleksey.makarov@auriga.com
Patchwork: https://patchwork.linux-mips.org/patch/11251/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Commit 1a3d59579b ("MIPS: Tidy up FPU context switching") removed FP
context saving from the asm-written resume function in favour of reusing
existing code to perform the same task. However it only removed the FP
context saving code from the r4k_switch.S implementation of resume.
Remove it from the r2300_switch.S implementation too in order to prevent
attempting to save the FP context twice, which would likely lead to an
exception from the second save because the FPU had already been disabled
by the first save.
This patch has only been build tested, using rbtx49xx_defconfig.
Fixes: 1a3d59579b ("MIPS: Tidy up FPU context switching")
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-kernel@vger.kernel.org
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/11167/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
- Allow users of mmc_of_parse() to succeed when CONFIG_GPIOLIB is unset
- Prevent infinite loop of re-tuning for CRC-errors for CMD19 and CMD21
MMC host:
- pxamci: Fix issues with card detect
- sunxi: Fix clk-delay settings
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Merge tag 'mmc-v4.3-rc3' of git://git.linaro.org/people/ulf.hansson/mmc
Pull MMC fixes from Ulf Hansson:
"Here are some mmc fixes intended for v4.3 rc4:
MMC core:
- Allow users of mmc_of_parse() to succeed when CONFIG_GPIOLIB is
unset
- Prevent infinite loop of re-tuning for CRC-errors for CMD19 and
CMD21
MMC host:
- pxamci: Fix issues with card detect
- sunxi: Fix clk-delay settings"
* tag 'mmc-v4.3-rc3' of git://git.linaro.org/people/ulf.hansson/mmc:
mmc: core: fix dead loop of mmc_retune
mmc: pxamci: fix card detect with slot-gpio API
mmc: sunxi: Fix clk-delay settings
mmc: core: Don't return an error for CD/WP GPIOs when GPIOLIB is unset
