Commit 7d48935e cleaned up the persistent-data's space-map-metadata
limits by elevating them to dm-space-map-metadata.h. Update
dm-cache-metadata to use these same limits.
The calculation for DM_CACHE_METADATA_MAX_SECTORS didn't account for the
sizeof the disk_bitmap_header. So the supported maximum metadata size
is a bit smaller (reduced from 33423360 to 33292800 sectors).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Factor out inc_and_issue and inc_ds helpers to simplify deferred set
reference count increments. Also cleanup cache_map to consistently call
cell_defer and inc_ds when the bio is DM_MAPIO_REMAPPED.
No functional change.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Track the size of any external origin. Previously the external origin's
size had to be a multiple of the thin-pool's block size, that is no
longer a requirement. In addition, snapshots that are larger than the
external origin are now supported.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Previously we used separate boolean values to track quiescing and
copying actions. By switching to an atomic_t we can support blocks that
need a partial copy and partial zero.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
pg_ready() is not comprehensive in its logic and only serves to
obfuscate code. Replace pg_ready() with the appropriate logic in
multipath_map().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Remove the io struct off the stack in sync_io() and allocate it from
the mempool like is done in async_io().
dec_count() now always calls a callback function and always frees the io
struct back to the mempool (so sync_io and async_io share this pattern).
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
nr_dirty is updated without locking, causing it to drift so that it is
non-zero (either a small positive integer, or a very large one when an
underflow occurs) even when there are no actual dirty blocks. This was
due to a race between the workqueue and map function accessing nr_dirty
in parallel without proper protection.
People were seeing under runs due to a race on increment/decrement of
nr_dirty, see: https://lkml.org/lkml/2014/6/3/648
Fix this by using an atomic_t for nr_dirty.
Reported-by: roma1390@gmail.com
Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
1d3d4437ea ("vmscan: per-node deferred work") added a flags field to
struct shrinker assuming that all shrinkers were zero filled. The dm
bufio shrinker is not zero filled, which leaves arbitrary kmalloc() data
in flags. So far the only defined flags bit is SHRINKER_NUMA_AWARE.
But there are proposed patches which add other bits to shrinker.flags
(e.g. memcg awareness).
Rather than simply initializing the shrinker, this patch uses kzalloc()
when allocating the dm_bufio_client to ensure that the embedded shrinker
and any other similar structures are zeroed.
This fixes theoretical over aggressive shrinking of dm bufio objects.
If the uninitialized dm_bufio_client.shrinker.flags contains
SHRINKER_NUMA_AWARE then shrink_slab() would call the dm shrinker for
each numa node rather than just once. This has been broken since 3.12.
Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.12+
Pull perf fixes from Thomas Gleixner:
"A bunch of fixes for perf and kprobes:
- revert a commit that caused a perf group regression
- silence dmesg spam
- fix kprobe probing errors on ia64 and ppc64
- filter kprobe faults from userspace
- lockdep fix for perf exit path
- prevent perf #GP in KVM guest
- correct perf event and filters"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
kprobes: Fix "Failed to find blacklist" probing errors on ia64 and ppc64
kprobes/x86: Don't try to resolve kprobe faults from userspace
perf/x86/intel: Avoid spamming kernel log for BTS buffer failure
perf/x86/intel: Protect LBR and extra_regs against KVM lying
perf: Fix lockdep warning on process exit
perf/x86/intel/uncore: Fix SNB-EP/IVT Cbox filter mappings
perf/x86/intel: Use proper dTLB-load-misses event on IvyBridge
perf: Revert ("perf: Always destroy groups on exit")
Pull x86 fixes from Peter Anvin:
"A couple of crash fixes, plus a fix that on 32 bits would cause a
missing -ENOSYS for nonexistent system calls"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, cpu: Fix cache topology for early P4-SMT
x86_32, entry: Store badsys error code in %eax
x86, MCE: Robustify mcheck_init_device
Pull vfs fixes from Christoph Hellwig:
"A vfsmount leak fix, and a compile warning fix"
* 'vfs-for-3.16' of git://git.infradead.org/users/hch/vfs:
fs: umount on symlink leaks mnt count
direct-io: fix uninitialized warning in do_direct_IO()
with some isochronous workloads (regression since v3.16-rc1).
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Merge tag 'firewire-fix-vt6315' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
Pull firewire regression fix from Stefan Richter:
"IEEE 1394 (FireWire) subsystem fix: MSI don't work on VIA PCIe
controllers with some isochronous workloads (regression since
v3.16-rc1)"
* tag 'firewire-fix-vt6315' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
firewire: ohci: disable MSI for VIA VT6315 again
Michel Dänzer and a couple of other people reported inexplicable random
oopses in the scheduler, and the cause turns out to be gcc mis-compiling
the load_balance() function when debugging is enabled. The gcc bug
apparently goes back to gcc-4.5, but slight optimization changes means
that it now showed up as a problem in 4.9.0 and 4.9.1.
The instruction scheduling problem causes gcc to schedule a spill
operation to before the stack frame has been created, which in turn can
corrupt the spilled value if an interrupt comes in. There may be other
effects of this bug too, but that's the code generation problem seen in
Michel's case.
This is fixed in current gcc HEAD, but the workaround as suggested by
Markus Trippelsdorf is pretty simple: use -fno-var-tracking-assignments
when compiling the kernel, which disables the gcc code that causes the
problem. This can result in slightly worse debug information for
variable accesses, but that is infinitely preferable to actual code
generation problems.
Doing this unconditionally (not just for CONFIG_DEBUG_INFO) also allows
non-debug builds to verify that the debug build would be identical: we
can do
export GCC_COMPARE_DEBUG=1
to make gcc internally verify that the result of the build is
independent of the "-g" flag (it will make the compiler build everything
twice, toggling the debug flag, and compare the results).
Without the "-fno-var-tracking-assignments" option, the build would fail
(even with 4.8.3 that didn't show the actual stack frame bug) with a gcc
compare failure.
See also gcc bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
Reported-by: Michel Dänzer <michel@daenzer.net>
Suggested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Shortly before 3.16-rc1, Dave Jones reported:
WARNING: CPU: 3 PID: 19721 at fs/xfs/xfs_aops.c:971
xfs_vm_writepage+0x5ce/0x630 [xfs]()
CPU: 3 PID: 19721 Comm: trinity-c61 Not tainted 3.15.0+ #3
Call Trace:
xfs_vm_writepage+0x5ce/0x630 [xfs]
shrink_page_list+0x8f9/0xb90
shrink_inactive_list+0x253/0x510
shrink_lruvec+0x563/0x6c0
shrink_zone+0x3b/0x100
shrink_zones+0x1f1/0x3c0
try_to_free_pages+0x164/0x380
__alloc_pages_nodemask+0x822/0xc90
alloc_pages_vma+0xaf/0x1c0
handle_mm_fault+0xa31/0xc50
etc.
970 if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
971 PF_MEMALLOC))
I did not respond at the time, because a glance at the PageDirty block
in shrink_page_list() quickly shows that this is impossible: we don't do
writeback on file pages (other than tmpfs) from direct reclaim nowadays.
Dave was hallucinating, but it would have been disrespectful to say so.
However, my own /var/log/messages now shows similar complaints
WARNING: CPU: 1 PID: 28814 at fs/ext4/inode.c:1881 ext4_writepage+0xa7/0x38b()
WARNING: CPU: 0 PID: 27347 at fs/ext4/inode.c:1764 ext4_writepage+0xa7/0x38b()
from stressing some mmotm trees during July.
Could a dirty xfs or ext4 file page somehow get marked PageSwapBacked,
so fail shrink_page_list()'s page_is_file_cache() test, and so proceed
to mapping->a_ops->writepage()?
Yes, 3.16-rc1's commit 68711a7463 ("mm, migration: add destination
page freeing callback") has provided such a way to compaction: if
migrating a SwapBacked page fails, its newpage may be put back on the
list for later use with PageSwapBacked still set, and nothing will clear
it.
Whether that can do anything worse than issue WARN_ON_ONCEs, and get
some statistics wrong, is unclear: easier to fix than to think through
the consequences.
Fixing it here, before the put_new_page(), addresses the bug directly,
but is probably the worst place to fix it. Page migration is doing too
many parts of the job on too many levels: fixing it in
move_to_new_page() to complement its SetPageSwapBacked would be
preferable, except why is it (and newpage->mapping and newpage->index)
done there, rather than down in migrate_page_move_mapping(), once we are
sure of success? Not a cleanup to get into right now, especially not
with memcg cleanups coming in 3.17.
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull drm fixes from Dave Airlie:
"This is radeon and intel fixes, and is a small bit larger than I'm
guessing you'd like it to be.
- i915: fixes 32-bit highmem i915 blank screen, semaphore hang and
runtime pm fix
- radeon: gpuvm stability fix for hangs since 3.15, and hang/reboot
regression on TN/RL devices,
The only slightly controversial one is the change to use GB for the
vm_size, which I'm letting through as its a new interface we defined
in this merge window, and I'd prefer to have the released kernel have
the final interface rather than changing it later"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/radeon: fix cut and paste issue for hawaii.
drm/radeon: fix irq ring buffer overflow handling
drm/i915: Simplify i915_gem_release_all_mmaps()
drm/radeon: fix error handling in radeon_vm_bo_set_addr
drm/i915: fix freeze with blank screen booting highmem
drm/i915: Reorder the semaphore deadlock check, again
drm/radeon/TN: only enable bapm on MSI systems
drm/radeon: fix VM IB handling
drm/radeon: fix handling of radeon_vm_bo_rmv v3
drm/radeon: let's use GB for vm_size (v2)
Here contains only the fixes for the new FireWire bebob driver.
All fairly trivial and local fixes, so safe to apply.
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Merge tag 'sound-3.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"Here contains only the fixes for the new FireWire bebob driver. All
fairly trivial and local fixes, so safe to apply"
* tag 'sound-3.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: bebob: Correction for return value of special_clk_ctl_put() in error
ALSA: bebob: Correction for return value of .put callback
ALSA: bebob: Use different labels for digital input/output
ALSA: bebob: Fix a missing to unlock mutex in error handling case
Do not split the PARPORT-related symbols with the new kconfig
symbol ARCH_MIGHT_HAVE_PC_PARPORT. The split was causing incorrect
display of these symbols -- they were not being displayed together
as they should be.
Fixes: d90c3eb315 "Kconfig cleanup (PARPORT_PC dependencies)"
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: stable@vger.kernel.org # for 3.13, 3.14, 3.15
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Merge tag 'blackfin-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/realmz6/blackfin-linux
Pull blackfin fixes from Steven Miao:
"smc nor flash PM fix, pinctrl group fix, update defconfig, and build
fixes"
* tag 'blackfin-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/realmz6/blackfin-linux:
blackfin: vmlinux.lds.S: reserve 32 bytes space at the end of data section for XIP kernel
defconfig: BF609: update spi config name
irq: blackfin sec: drop duplicated sec priority set
blackfin: bind different groups of one pinmux function to different state name
blackfin: fix some bf5xx boards build for missing <linux/gpio.h>
pm: bf609: cleanup smc nor flash
drop smc pin state change code, pin state will be saved in pinctrl-adi2 driver
cleanup nor flash init/exit for pm suspend/resume
Signed-off-by: Steven Miao <realmz6@gmail.com>
Pull parisc fixes from Helge Deller:
"We have two trivial patches in here. One removes the SA_RESTORER
#define since on parisc we don't have the sa_restorer field in struct
sigaction, the other patch removes an unnecessary memset().
The SA_RESTORER removal patch is scheduled for stable trees, since
without it some userspace apps don't build"
* 'parisc-3.16-6' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Eliminate memset after alloc_bootmem_pages
parisc: Remove SA_RESTORER define
Pull fuse fixes from Miklos Szeredi:
"These two pathes fix issues with the kernel-userspace protocol changes
in v3.15"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: add FUSE_NO_OPEN_SUPPORT flag to INIT
fuse: s_time_gran fix
This fix was necessary after
9c15a24b03 ("x86/mce: Improve mcheck_init_device() error handling")
went in. What this patch did was, among others, check the return value
of misc_register and exit early if it encountered an error. Original
code sloppily didn't do that.
However,
cef12ee52b ("xen/mce: Add mcelog support for Xen platform")
made it so that xen's init routine xen_late_init_mcelog runs first. This
was needed for the xen mcelog device which is supposed to be independent
from the baremetal one.
Initially it was reported that misc_register() fails often on xen and
that's why it needed fixing. However, it is *supposed* to fail by
design, when running in dom0 so that the xen mcelog device file gets
registered first.
And *then* you need the notifier *not* unregistered on the error path so
that the timer does get deleted properly in the CPU hotplug notifier.
Btw, this fix is needed also on baremetal in the unlikely event that
misc_register(&mce_chrdev_device) fails there too.
I was unsure whether to rush it in now and decided to delay it to 3.17.
However, xen people wanted it promoted as it breaks xen when doing cpu
hotplug there. So, after a bit of simmering in tip/master for initial
smoke testing, let's move it to 3.16. It fixes a semi-regression which
got introduced in 3.16 so no need for stable tagging.
tip/x86/ras contains that exact same commit but we can't remove it
there as it is not the last one. It won't cause any merge issues, as I
confirmed locally but I should state here the special situation of this
one fix explicitly anyway.
Thanks.
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x86: Merge tag 'ras_urgent' into x86/urgent
Promote one fix for 3.16
This fix was necessary after
9c15a24b03 ("x86/mce: Improve mcheck_init_device() error handling")
went in. What this patch did was, among others, check the return value
of misc_register and exit early if it encountered an error. Original
code sloppily didn't do that.
However,
cef12ee52b ("xen/mce: Add mcelog support for Xen platform")
made it so that xen's init routine xen_late_init_mcelog runs first. This
was needed for the xen mcelog device which is supposed to be independent
from the baremetal one.
Initially it was reported that misc_register() fails often on xen and
that's why it needed fixing. However, it is *supposed* to fail by
design, when running in dom0 so that the xen mcelog device file gets
registered first.
And *then* you need the notifier *not* unregistered on the error path so
that the timer does get deleted properly in the CPU hotplug notifier.
Btw, this fix is needed also on baremetal in the unlikely event that
misc_register(&mce_chrdev_device) fails there too.
I was unsure whether to rush it in now and decided to delay it to 3.17.
However, xen people wanted it promoted as it breaks xen when doing cpu
hotplug there. So, after a bit of simmering in tip/master for initial
smoke testing, let's move it to 3.16. It fixes a semi-regression which
got introduced in 3.16 so no need for stable tagging.
tip/x86/ras contains that exact same commit but we can't remove it
there as it is not the last one. It won't cause any merge issues, as I
confirmed locally but I should state here the special situation of this
one fix explicitly anyway.
Thanks.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This is a halfway fix for hawaii acceleration. More fixes to come
but hopefully isolated to userspace.
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
two more radeon fixes.
* 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux:
drm/radeon: fix irq ring buffer overflow handling
drm/radeon: fix error handling in radeon_vm_bo_set_addr
This time in time! Just 32bit-pae fix from Hugh, semaphores fun from Chris
and a fix for runtime pm cherry-picked from next.
Paulo is still working on a fix for runtime pm when X does cursor fun when
the display is off, but that one isn't ready yet.
* tag 'drm-intel-fixes-2014-07-24' of git://anongit.freedesktop.org/drm-intel:
drm/i915: Simplify i915_gem_release_all_mmaps()
drm/i915: fix freeze with blank screen booting highmem
drm/i915: Reorder the semaphore deadlock check, again
alloc_bootmem and related function always return zeroed region of
memory. Thus a memset after calls to these functions is unnecessary.
The following Coccinelle semantic patch was used for making the change:
@@
expression E,E1;
@@
E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
... when != E
- memset(E,0,E1);
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Helge Deller <deller@gmx.de>
The sa_restorer field in struct sigaction is obsolete and no longer in
the parisc implementation. However, the core code assumes the field is
present if SA_RESTORER is defined. So, the define needs to be removed.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Temperature limit clamps are applied after converting the temperature
from milli-degrees C to degrees C, so either the clamp limit needs
to be specified in degrees C, not milli-degrees C, or clamping must
happen before converting to degrees C. Use the latter method to avoid
overflows.
vrm is an u8, so the written value needs to be limited to [0, 255].
Cc: Axel Lin <axel.lin@ingics.com>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Currently umount on symlink blocks following umount:
/vz is separate mount
# ls /vz/ -al | grep test
drwxr-xr-x. 2 root root 4096 Jul 19 01:14 testdir
lrwxrwxrwx. 1 root root 11 Jul 19 01:16 testlink -> /vz/testdir
# umount -l /vz/testlink
umount: /vz/testlink: not mounted (expected)
# lsof /vz
# umount /vz
umount: /vz: device is busy. (unexpected)
In this case mountpoint_last() gets an extra refcount on path->mnt
Signed-off-by: Vasily Averin <vvs@openvz.org>
Acked-by: Ian Kent <raven@themaw.net>
Acked-by: Jeff Layton <jlayton@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
The following warnings:
fs/direct-io.c: In function ‘__blockdev_direct_IO’:
fs/direct-io.c:1011:12: warning: ‘to’ may be used uninitialized in this function [-Wmaybe-uninitialized]
fs/direct-io.c:913:16: note: ‘to’ was declared here
fs/direct-io.c:1011:12: warning: ‘from’ may be used uninitialized in this function [-Wmaybe-uninitialized]
fs/direct-io.c:913:10: note: ‘from’ was declared here
are false positive because dio_get_page() either fails, or sets both
'from' and 'to'.
Paul Bolle said ...
Maybe it's better to move initializing "to" and "from" out of
dio_get_page(). That _might_ make it easier for both the the reader and
the compiler to understand what's going on. Something like this:
Christoph Hellwig said ...
The fix of moving the code definitively looks nicer, while I think
uninitialized_var is horrible wart that won't get anywhere near my code.
Boaz Harrosh: I agree with Christoph and Paul
Signed-off-by: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Pull nfsd bugfix from Bruce Fields:
"Another regression from the xdr encoding rewrite"
* 'for-3.16' of git://linux-nfs.org/~bfields/linux:
NFSD: Fix crash encoding lock reply on 32-bit
- resolve FIXMEs in double exception handler for window overflow. This
fix makes native building of linux on xtensa host possible;
- fix sysmem region removal issue introduced in 3.15.
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Merge tag 'xtensa-next-20140721' of git://github.com/czankel/xtensa-linux
Pull Xtensa fixes from Chris Zankel:
- resolve FIXMEs in double exception handler for window overflow. This
fix makes native building of linux on xtensa host possible;
- fix sysmem region removal issue introduced in 3.15.
* tag 'xtensa-next-20140721' of git://github.com/czankel/xtensa-linux:
xtensa: fix sysmem reservation at the end of existing block
xtensa: add fixup for double exception raised in window overflow
- An IRQ handling fix for the STi driver, also for stable
- Another IRQ fix for the RCAR GPIO driver
- A MAINTAINERS entry
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Merge tag 'pinctrl-v3.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
"Here are three pin control fixes for the v3.16 series. Sorry that
some of these arrive late, the summer heat in Sweden makes me slow.
- an IRQ handling fix for the STi driver, also for stable
- another IRQ fix for the RCAR GPIO driver
- a MAINTAINERS entry"
* tag 'pinctrl-v3.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
gpio: rcar: Add support for DT IRQ flags
MAINTAINERS: Add entry for the Renesas pin controller driver
pinctrl: st: Fix irqmux handler
Pull libata regression fix from Tejun Heo:
"The last libata/for-3.16-fixes pull contained a regression introduced
by 1871ee134b ("libata: support the ata host which implements a
queue depth less than 32") which in turn was a fix for a regression
introduced earlier while changing queue tag order to accomodate hard
drives which perform poorly if tags are not allocated in circular
order (ugh...).
The regression happens only for SAS controllers making use of libata
to serve ATA devices. They don't fill an ata_host field which is used
by the new tag allocation function leading to NULL dereference.
This patch adds a new intermediate field ata_host->n_tags which is
initialized for both SAS and !SAS cases to fix the issue"
* 'for-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
libata: introduce ata_host->n_tags to avoid oops on SAS controllers
Pull powerpc fixes from Ben Herrenschmidt:
"Here is a handful of powerpc fixes for 3.16. They are all pretty
simple and self contained and should still make this release"
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc: use _GLOBAL_TOC for memmove
powerpc/pseries: dynamically added OF nodes need to call of_node_init
powerpc: subpage_protect: Increase the array size to take care of 64TB
powerpc: Fix bugs in emulate_step()
powerpc: Disable doorbells on Power8 DD1.x
kmem_cache_sanity_check() that has been repeatedly reported (as recently
as today against Fedora rawhide). Pekka seemed to have it staged for a
late 3.15-rc in his 'slab/urgent' branch but never sent a pull request,
see: https://lkml.org/lkml/2014/5/23/648
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Merge tag 'urgent-slab-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull slab fix from Mike Snitzer:
"This fixes the broken duplicate slab name check in
kmem_cache_sanity_check() that has been repeatedly reported (as
recently as today against Fedora rawhide).
Pekka seemed to have it staged for a late 3.15-rc in his 'slab/urgent'
branch but never sent a pull request, see:
https://lkml.org/lkml/2014/5/23/648"
* tag 'urgent-slab-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
slab_common: fix the check for duplicate slab names
Merge fixes from Andrew Morton:
"10 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: hugetlb: fix copy_hugetlb_page_range()
simple_xattr: permit 0-size extended attributes
mm/fs: fix pessimization in hole-punching pagecache
shmem: fix splicing from a hole while it's punched
shmem: fix faulting into a hole, not taking i_mutex
mm: do not call do_fault_around for non-linear fault
sh: also try passing -m4-nofpu for SH2A builds
zram: avoid lockdep splat by revalidate_disk
mm/rmap.c: fix pgoff calculation to handle hugepage correctly
coredump: fix the setting of PF_DUMPCORE
Commit 4a705fef98 ("hugetlb: fix copy_hugetlb_page_range() to handle
migration/hwpoisoned entry") changed the order of
huge_ptep_set_wrprotect() and huge_ptep_get(), which leads to breakage
in some workloads like hugepage-backed heap allocation via libhugetlbfs.
This patch fixes it.
The test program for the problem is shown below:
$ cat heap.c
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#define HPS 0x200000
int main() {
int i;
char *p = malloc(HPS);
memset(p, '1', HPS);
for (i = 0; i < 5; i++) {
if (!fork()) {
memset(p, '2', HPS);
p = malloc(HPS);
memset(p, '3', HPS);
free(p);
return 0;
}
}
sleep(1);
free(p);
return 0;
}
$ export HUGETLB_MORECORE=yes ; export HUGETLB_NO_PREFAULT= ; hugectl --heap ./heap
Fixes 4a705fef98 ("hugetlb: fix copy_hugetlb_page_range() to handle
migration/hwpoisoned entry"), so is applicable to -stable kernels which
include it.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reported-by: Guillaume Morin <guillaume@morinfr.org>
Suggested-by: Guillaume Morin <guillaume@morinfr.org>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org> [2.6.37+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
If a filesystem uses simple_xattr to support user extended attributes,
LTP setxattr01 and xfstests generic/062 fail with "Cannot allocate
memory": simple_xattr_alloc()'s wrap-around test mistakenly excludes
values of zero size. Fix that off-by-one (but apparently no filesystem
needs them yet).
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: Aristeu Rozanski <aris@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
I wanted to revert my v3.1 commit d0823576bf ("mm: pincer in
truncate_inode_pages_range"), to keep truncate_inode_pages_range() in
synch with shmem_undo_range(); but have stepped back - a change to
hole-punching in truncate_inode_pages_range() is a change to
hole-punching in every filesystem (except tmpfs) that supports it.
If there's a logical proof why no filesystem can depend for its own
correctness on the pincer guarantee in truncate_inode_pages_range() - an
instant when the entire hole is removed from pagecache - then let's
revisit later. But the evidence is that only tmpfs suffered from the
livelock, and we have no intention of extending hole-punch to ramfs. So
for now just add a few comments (to match or differ from those in
shmem_undo_range()), and fix one silliness noticed in d0823576bf4b...
Its "index == start" addition to the hole-punch termination test was
incomplete: it opened a way for the end condition to be missed, and the
loop go on looking through the radix_tree, all the way to end of file.
Fix that pessimization by resetting index when detected in inner loop.
Note that it's actually hard to hit this case, without the obsessive
concurrent faulting that trinity does: normally all pages are removed in
the initial trylock_page() pass, and this loop finds nothing to do. I
had to "#if 0" out the initial pass to reproduce bug and test fix.
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Lukas Czerner <lczerner@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
