Pull more i2c updates from Wolfram Sang:
 "Here is the second pull request from I2C for this merge window:

   - one new feature (which nearly fell through the cracks): i2c-dev
     does now use the cdev API so it can handle >256 minors.  Seems
     people do need that.

   - two fixes for the just added DMA feature for i2c-rcar

   - some typo fixes"

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: dev: don't start function name with 'return'
  i2c: dev: switch from register_chrdev to cdev API
  i2c: xlr: rename ARCH_TANGOX to ARCH_TANGO
  i2c: at91: change log when dma configuration fails
  misc: at24: Fix typo in at24 header file
  i2c: rcar: should depend on HAS_DMA
  i2c: rcar: use dma_request_chan()

Pull UML updates from Richard Weinberger:
 "This contains a nice FPU fixup from Eli Cooper for UML"

* 'for-linus-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: add extended processor state save/restore support
  um: extend fpstate to _xstate to support YMM registers
  um: fix FPU state preservation around signal handlers

Pull UBI/UBIFS updates from Richard Weinberger:
 "This contains mostly cleanups and minor improvements of UBI and UBIFS"

* tag 'upstream-4.7-rc1' of git://git.infradead.org/linux-ubifs:
  ubifs: ubifs_dump_inode: Fix dumping field bulk_read
  UBI: Fix static volume checks when Fastmap is used
  UBI: Set free_count to zero before walking through erase list
  UBI: Silence an unintialized variable warning
  UBI: Clean up return in ubi_remove_volume()
  UBI: Modify wrong comment in ubi_leb_map function.
  UBI: Don't read back all data in ubi_eba_copy_leb()
  UBI: Add ro-mode sysfs attribute

Older versions of gcc don't understand named initializers inside a
anonymous structure or union member.  It can be worked around by adding
the bracin gin the initializer for the anonymous member.

Without this, gcc 4.4.4 will fail the build with

    CC      fs/nfs/nfs4state.o
  fs/nfs/nfs4state.c:69: error: unknown field ‘data’ specified in initializer
  fs/nfs/nfs4state.c:69: warning: missing braces around initializer
  fs/nfs/nfs4state.c:69: warning: (near initialization for ‘zero_stateid.<anonymous>.data’)
  make[2]: *** [fs/nfs/nfs4state.o] Error 1

introduced in commit 93b717fd ("NFSv4: Label stateids with the type")
Reported-and-tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Anna Schumaker <Anna.Schumaker@netapp.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull vfs fixes from Al Viro:
 "Followups to the parallel lookup work:

   - update docs

   - restore killability of the places that used to take ->i_mutex
     killably now that we have down_write_killable() merged

   - Additionally, it turns out that I missed a prerequisite for
     security_d_instantiate() stuff - ->getxattr() wasn't the only thing
     that could be called before dentry is attached to inode; with smack
     we needed the same treatment applied to ->setxattr() as well"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  switch ->setxattr() to passing dentry and inode separately
  switch xattr_handler->set() to passing dentry and inode separately
  restore killability of old mutex_lock_killable(&inode->i_mutex) users
  add down_write_killable_nested()
  update D/f/directory-locking

smack ->d_instantiate() uses ->setxattr(), so to be able to call it before
we'd hashed the new dentry and attached it to inode, we need ->setxattr()
instances getting the inode as an explicit argument rather than obtaining
it from dentry.

Similar change for ->getxattr() had been done in commit ce23e640.  Unlike
->getxattr() (which is used by both selinux and smack instances of
->d_instantiate()) ->setxattr() is used only by smack one and unfortunately
it got missed back then.
Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Pull overlayfs update from Miklos Szeredi:
 "The meat of this is a change to use the mounter's credentials for
  operations that require elevated privileges (such as whiteout
  creation).  This fixes behavior under user namespaces as well as being
  a nice cleanup"

* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: Do d_type check only if work dir creation was successful
  ovl: update documentation
  ovl: override creds with the ones from the superblock mounter

Pull btrfs cleanups and fixes from Chris Mason:
 "We have another round of fixes and a few cleanups.

  I have a fix for short returns from btrfs_copy_from_user, which
  finally nails down a very hard to find regression we added in v4.6.

  Dave is pushing around gfp parameters, mostly to cleanup internal apis
  and make it a little more consistent.

  The rest are smaller fixes, and one speelling fixup patch"

* 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (22 commits)
  Btrfs: fix handling of faults from btrfs_copy_from_user
  btrfs: fix string and comment grammatical issues and typos
  btrfs: scrub: Set bbio to NULL before calling btrfs_map_block
  Btrfs: fix unexpected return value of fiemap
  Btrfs: free sys_array eb as soon as possible
  btrfs: sink gfp parameter to convert_extent_bit
  btrfs: make state preallocation more speculative in __set_extent_bit
  btrfs: untangle gotos a bit in convert_extent_bit
  btrfs: untangle gotos a bit in __clear_extent_bit
  btrfs: untangle gotos a bit in __set_extent_bit
  btrfs: sink gfp parameter to set_record_extent_bits
  btrfs: sink gfp parameter to set_extent_new
  btrfs: sink gfp parameter to set_extent_defrag
  btrfs: sink gfp parameter to set_extent_delalloc
  btrfs: sink gfp parameter to clear_extent_dirty
  btrfs: sink gfp parameter to clear_record_extent_bits
  btrfs: sink gfp parameter to clear_extent_bits
  btrfs: sink gfp parameter to set_extent_bits
  btrfs: make find_workspace warn if there are no workspaces
  btrfs: make find_workspace always succeed
  ...

Now that the allmodconfig x86-64 build is clean wrt IS_ERR_VALUE() uses
on integers, add a cast to a pointer and back to the argument, so that
any new mis-uses of IS_ERR_VALUE() will cause warnings like

   warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

so that we don't re-introduce any bogus uses.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The do_brk() and vm_brk() return value was "unsigned long" and returned
the starting address on success, and an error value on failure.  The
reasons are entirely historical, and go back to it basically behaving
like the mmap() interface does.

However, nobody actually wanted that interface, and it causes totally
pointless IS_ERR_VALUE() confusion.

What every single caller actually wants is just the simpler integer
return of zero for success and negative error number on failure.

So just convert to that much clearer and more common calling convention,
and get rid of all the IS_ERR_VALUE() uses wrt vm_brk().
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Most users of IS_ERR_VALUE() in the kernel are wrong, as they
pass an 'int' into a function that takes an 'unsigned long'
argument. This happens to work because the type is sign-extended
on 64-bit architectures before it gets converted into an
unsigned type.

However, anything that passes an 'unsigned short' or 'unsigned int'
argument into IS_ERR_VALUE() is guaranteed to be broken, as are
8-bit integers and types that are wider than 'unsigned long'.

Andrzej Hajda has already fixed a lot of the worst abusers that
were causing actual bugs, but it would be nice to prevent any
users that are not passing 'unsigned long' arguments.

This patch changes all users of IS_ERR_VALUE() that I could find
on 32-bit ARM randconfig builds and x86 allmodconfig. For the
moment, this doesn't change the definition of IS_ERR_VALUE()
because there are probably still architecture specific users
elsewhere.

Almost all the warnings I got are for files that are better off
using 'if (err)' or 'if (err < 0)'.
The only legitimate user I could find that we get a warning for
is the (32-bit only) freescale fman driver, so I did not remove
the IS_ERR_VALUE() there but changed the type to 'unsigned long'.
For 9pfs, I just worked around one user whose calling conventions
are so obscure that I did not dare change the behavior.

I was using this definition for testing:

 #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \
       unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO))

which ends up making all 16-bit or wider types work correctly with
the most plausible interpretation of what IS_ERR_VALUE() was supposed
to return according to its users, but also causes a compile-time
warning for any users that do not pass an 'unsigned long' argument.

I suggested this approach earlier this year, but back then we ended
up deciding to just fix the users that are obviously broken. After
the initial warning that caused me to get involved in the discussion
(fs/gfs2/dir.c) showed up again in the mainline kernel, Linus
asked me to send the whole thing again.

[ Updated the 9p parts as per Al Viro  - Linus ]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.org/lkml/2016/1/7/363
Link: https://lkml.org/lkml/2016/5/27/486
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # For nvmem part
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The register_page_bootmem_info_node() function needs to be marked __init
in order to avoid a new warning introduced by commit f65e91df ("mm:
use early_pfn_to_nid in register_page_bootmem_info_node").

Otherwise you'll get a warning about how a non-init function calls
early_pfn_to_nid (which is __meminit)

Cc: Yang Shi <yang.shi@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge misc updates and fixes from Andrew Morton:

 - late-breaking ocfs2 updates

 - random bunch of fixes

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: disable DEFERRED_STRUCT_PAGE_INIT on !NO_BOOTMEM
  mm/memcontrol.c: move comments for get_mctgt_type() to proper position
  mm/memcontrol.c: fix the margin computation in mem_cgroup_margin()
  mm/cma: silence warnings due to max() usage
  mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap()
  oom_reaper: close race with exiting task
  mm: use early_pfn_to_nid in register_page_bootmem_info_node
  mm: use early_pfn_to_nid in page_ext_init
  MAINTAINERS: Kdump maintainers update
  MAINTAINERS: add kexec_core.c and kexec_file.c
  mm: oom: do not reap task if there are live threads in threadgroup
  direct-io: fix direct write stale data exposure from concurrent buffered read
  ocfs2: bump up o2cb network protocol version
  ocfs2: o2hb: fix hb hung time
  ocfs2: o2hb: don't negotiate if last hb fail
  ocfs2: o2hb: add some user/debug log
  ocfs2: o2hb: add NEGOTIATE_APPROVE message
  ocfs2: o2hb: add NEGO_TIMEOUT message
  ocfs2: o2hb: add negotiate timer

When we have !NO_BOOTMEM, the deferred page struct initialization
doesn't work well because the pages reserved in bootmem are released to
the page allocator uncoditionally.  It causes memory corruption and
system crash eventually.

As Mel suggested, the bootmem is retiring slowly.  We fix the issue by
simply hiding DEFERRED_STRUCT_PAGE_INIT when bootmem is enabled.

Link: http://lkml.kernel.org/r/1460602170-5821-1-git-send-email-gwshan@linux.vnet.ibm.comSigned-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Move the comments for get_mctgt_type() to be before get_mctgt_type()
implementation.

Link: http://lkml.kernel.org/r/1463644638-7446-1-git-send-email-roy.qing.li@gmail.comSigned-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mem_cgroup_margin() might return (memory.limit - memory_count) when the
memsw.limit is in excess.  This doesn't happen usually because we do not
allow excess on hard limits and (memory.limit <= memsw.limit), but
__GFP_NOFAIL charges can force the charge and cause the excess when no
memory is really swappable (swap is full or no anonymous memory is
left).

[mhocko@suse.com: rewrote changelog]
  Link: http://lkml.kernel.org/r/20160525155122.GK20132@dhcp22.suse.cz
Link: http://lkml.kernel.org/r/1464068266-27736-1-git-send-email-roy.qing.li@gmail.comSigned-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

pageblock_order can be (at least) an unsigned int or an unsigned long
depending on the kernel config and architecture, so use max_t(unsigned
long, ...) when comparing it.

fixes these warnings:

In file included from include/asm-generic/bug.h:13:0,
                 from arch/powerpc/include/asm/bug.h:127,
                 from include/linux/bug.h:4,
                 from include/linux/mmdebug.h:4,
                 from include/linux/mm.h:8,
                 from include/linux/memblock.h:18,
                 from mm/cma.c:28:
mm/cma.c: In function 'cma_init_reserved_mem':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);                   ^
mm/cma.c:186:27: note: in expansion of macro 'max'
  alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
                           ^
mm/cma.c: In function 'cma_declare_contiguous':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);                   ^
include/linux/kernel.h:747:9: note: in definition of macro 'max'
  typeof(y) _max2 = (y);            ^
mm/cma.c:270:29: note: in expansion of macro 'max'
   (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
                             ^
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);                   ^
include/linux/kernel.h:747:21: note: in definition of macro 'max'
  typeof(y) _max2 = (y);                        ^
mm/cma.c:270:29: note: in expansion of macro 'max'
   (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
                             ^

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20160526150748.5be38a4f@canb.auug.org.auSigned-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If page_move_anon_rmap() is refiling a pmd-splitted THP mapped in a tail
page from a pte, the "address" must be THP aligned in order for the
page->index bugcheck to pass in the CONFIG_DEBUG_VM=y builds.

Link: http://lkml.kernel.org/r/1464253620-106404-1-git-send-email-kirill.shutemov@linux.intel.com
Fixes: 6d0a07ed ("mm: thp: calculate the mapcount correctly for THP pages during WP faults")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>        [4.5]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Tetsuo has reported:
  Out of memory: Kill process 443 (oleg's-test) score 855 or sacrifice child
  Killed process 443 (oleg's-test) total-vm:493248kB, anon-rss:423880kB, file-rss:4kB, shmem-rss:0kB
  sh invoked oom-killer: gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), order=0, oom_score_adj=0
  sh cpuset=/ mems_allowed=0
  CPU: 2 PID: 1 Comm: sh Not tainted 4.6.0-rc7+ #51
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
  Call Trace:
    dump_stack+0x85/0xc8
    dump_header+0x5b/0x394
  oom_reaper: reaped process 443 (oleg's-test), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

In other words:

  __oom_reap_task		exit_mm
    atomic_inc_not_zero
				  tsk->mm = NULL
				  mmput
				    atomic_dec_and_test # > 0
				  exit_oom_victim # New victim will be
						  # selected
				<OOM killer invoked>
				  # no TIF_MEMDIE task so we can select a new one
    unmap_page_range # to release the memory

The race exists even without the oom_reaper because anybody who pins the
address space and gets preempted might race with exit_mm but oom_reaper
made this race more probable.

We can address the oom_reaper part by using oom_lock for __oom_reap_task
because this would guarantee that a new oom victim will not be selected
if the oom reaper might race with the exit path.  This doesn't solve the
original issue, though, because somebody else still might be pinning
mm_users and so __mmput won't be called to release the memory but that
is not really realiably solvable because the task will get away from the
oom sight as soon as it is unhashed from the task_list and so we cannot
guarantee a new victim won't be selected.

[akpm@linux-foundation.org: fix use of unused `mm', Per Stephen]
[akpm@linux-foundation.org: coding-style fixes]
Fixes: aac45363 ("mm, oom: introduce oom reaper")
Link: http://lkml.kernel.org/r/1464271493-20008-1-git-send-email-mhocko@kernel.orgSigned-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

register_page_bootmem_info_node() is invoked in mem_init(), so it will
be called before page_alloc_init_late() if DEFERRED_STRUCT_PAGE_INIT is
enabled.  But, pfn_to_nid() depends on memmap which won't be fully setup
until page_alloc_init_late() is done, so replace pfn_to_nid() by
early_pfn_to_nid().

Link: http://lkml.kernel.org/r/1464210007-30930-1-git-send-email-yang.shi@linaro.orgSigned-off-by: Yang Shi <yang.shi@linaro.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

page_ext_init() checks suitable pages with pfn_to_nid(), but
pfn_to_nid() depends on memmap which will not be setup fully until
page_alloc_init_late() is done.  Use early_pfn_to_nid() instead of
pfn_to_nid() so that page extension could be still used early even
though CONFIG_ DEFERRED_STRUCT_PAGE_INIT is enabled and catch early page
allocation call sites.

Suggested by Joonsoo Kim [1], this fix basically undoes the change
introduced by commit b8f1a75d ("mm: call page_ext_init() after all
struct pages are initialized") and fixes the same problem with a better
approach.

[1] http://lkml.kernel.org/r/CAAmzW4OUmyPwQjvd7QUfc6W1Aic__TyAuH80MLRZNMxKy0-wPQ@mail.gmail.com

Link: http://lkml.kernel.org/r/1464198689-23458-1-git-send-email-yang.shi@linaro.orgSigned-off-by: Yang Shi <yang.shi@linaro.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

I am proposing following updates to kdump maintainership.  I have got
busy in other things and not getting time to spend on kdump.

Remove Haren Myneni as he has not participated in kdump development for
a long time now.

Add the names of Dave and Baoquan as kdump maintainers as they have been
contributing to kdump for a long time now and they are in a much better
position to spend time on this than me.

Mark myself as a reviewer.

Link: http://lkml.kernel.org/r/20160525131616.GB27291@redhat.comSigned-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Simon Horman <horms@verge.net.au>
Cc: Haren Myneni <hbabu@us.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

In the below commits kexec.c was split to kexec.c, kexec_file.c and
kexec_core.c.

commit a43cac0d ("kexec: split kexec_file syscall code to kexec_file.c")
commit 2965faa5 ("kexec: split kexec_load syscall from kexec core code")

Both kexec_file.c and kexec_core.c still belong to the kexec component.
In order to get correct mail lists by using the script get_maintainer.pl,
add these files to MAINTAINERS.

Link: http://lkml.kernel.org/r/1464189735-59113-1-git-send-email-mnghuan@gmail.comSigned-off-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If the current process is exiting, we don't invoke oom killer, instead
we give it access to memory reserves and try to reap its mm in case
nobody is going to use it.  There's a mistake in the code performing
this check - we just ignore any process of the same thread group no
matter if it is exiting or not - see try_oom_reaper.  Fix it.

Link: http://lkml.kernel.org/r/1464087628-7318-1-git-send-email-vdavydov@virtuozzo.com
Fixes: 3ef22dff ("oom, oom_reaper: try to reap tasks which skip regular OOM killer path")Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Currently direct writes inside i_size on a DIO_SKIP_HOLES filesystem are
not allowed to allocate blocks(get_more_blocks() sets 'create' to 0
before calling get_block() callback), if it's a sparse file, direct
writes fall back to buffered writes to avoid stale data exposure from
concurrent buffered read.  But there're two cases that can result in
stale data exposure are not correctly detected.

1. The detection for "writing inside i_size" is not sufficient,
   writes can be treated as "extending writes" wrongly.  For example,
   direct write 1FSB (file system block) to a 1FSB sparse file on
   ext2/3/4, starting from offset 0, in this case it's writing inside
   i_size, but 'create' is non-zero, because 'block_in_file' and
   '(i_size_read(inode) >> blkbits' are both zero.

2. Direct writes starting from or beyong i_size (not inside i_size)
   also could trigger block allocation and expose stale data.  For
   example, consider a sparse file with i_size of 2k, and a write to
   offset 2k or 3k into the file, with a filesystem block size of 4k.
   (Thanks to Jeff Moyer for pointing this case out in his review.)

The first problem can be demostrated by running ltp-aiodio test ADSP045
many times.  When testing on extN filesystems, I see test failures
occasionally, buffered read could read non-zero (stale) data.

ADSP045: dio_sparse -a 4k -w 4k -s 2k -n 1

dio_sparse    0  TINFO  :  Dirtying free blocks
dio_sparse    0  TINFO  :  Starting I/O tests
non zero buffer at buf[0] => 0xffffffaa,ffffffaa,ffffffaa,ffffffaa
non-zero read at offset 0
dio_sparse    0  TINFO  :  Killing childrens(s)
dio_sparse    1  TFAIL  :  dio_sparse.c:191: 1 children(s) exited abnormally

The second problem can also be reproduced easily by a hacked dio_sparse
program, which accepts an option to specify the write offset.

What we should really do is to disable block allocation for writes that
could result in filling holes inside i_size.

Link: http://lkml.kernel.org/r/1463156728-13357-1-git-send-email-guaneryu@gmail.comReviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Two new messages are added to support negotiating hb timeout.  Stop
nodes frmo talking an old version to mount as they will cause the
negotiation to fail.

Link: http://lkml.kernel.org/r/1464231615-27939-1-git-send-email-junxiao.bi@oracle.comSigned-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

hr_last_timeout_start should be set as the last time where hb is
still OK.  When hb write timeout, hung time will be (jiffies -
hr_last_timeout_start).
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Sometimes io error is returned when storage is down for a while.  Like
for iscsi device, stroage is made offline when session timeout, and this
will make all io return -EIO.  For this case, nodes shouldn't do
negotiate timeout but should fence self.  So let nodes fence self when
o2hb_do_disk_heartbeat return an error, this is the same behavior with
o2hb without negotiate timer.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This message is used to re-queue write timeout timer and negotiate timer
when all nodes suffer a write hung to storage, this makes node not fence
self if storage down.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This message is sent to master node when non-master nodes's negotiate
timer expired.  Master node records these nodes in a bitmap which is
used to do write timeout timer re-queue decision.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This series of patches is to fix the issue that when storage down, all
nodes will fence self due to write timeout.

With this patch set, all nodes will keep going until storage back
online, except if the following issue happens, then all nodes will do as
before to fence self.

1. io error got
2. network between nodes down
3. nodes panic

This patch (of 6):

When storage down, all nodes will fence self due to write timeout.  The
negotiate timer is designed to avoid this, with it node will wait until
storage up again.

Negotiate timer working in the following way:

1. The timer expires before write timeout timer, its timeout is half
   of write timeout now.  It is re-queued along with write timeout timer.
   If expires, it will send NEGO_TIMEOUT message to master node(node with
   lowest node number).  This message does nothing but marks a bit in a
   bitmap recording which nodes are negotiating timeout on master node.

2. If storage down, nodes will send this message to master node, then
   when master node finds its bitmap including all online nodes, it sends
   NEGO_APPROVL message to all nodes one by one, this message will
   re-queue write timeout timer and negotiate timer.  For any node doesn't
   receive this message or meets some issue when handling this message, it
   will be fenced.  If storage up at any time, o2hb_thread will run and
   re-queue all the timer, nothing will be affected by these two steps.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull block fixes from Jens Axboe:
 "A set of fixes that wasn't included in the first merge window pull
  request.  This pull request contains:

   - A set of NVMe fixes from Keith, and one from Nic for the integrity
     side of it.

   - Fix from Ming, clearing ->mq_ops if we don't successfully setup a
     queue for multiqueue.

   - A set of stability fixes for bcache from Jiri, and also marking
     bcache as orphaned as it's no longer actively maintained (in
     mainline, at least)"

* 'for-linus' of git://git.kernel.dk/linux-block:
  blk-mq: clear q->mq_ops if init fail
  MAINTAINERS: mark bcache as orphan
  bcache: bch_gc_thread() is not freezable
  bcache: bch_allocator_thread() is not freezable
  bcache: bch_writeback_thread() is not freezable
  nvme/host: Add missing blk_integrity tag_size + flags assignments
  NVMe: Add device ID's with stripe quirk
  NVMe: Short-cut removal on surprise hot-unplug
  NVMe: Allow user initiated rescan
  NVMe: Reduce driver log spamming
  NVMe: Unbind driver on failure
  NVMe: Delete only created queues
  NVMe: Allocate queues only for online cpus

Pull MTD fixes from Brian Norris:
 "We've already noticed a few flaws in the MTD work for v4.7-rc1:

   - The Atmel folks got ahead of themselves on trying to support their
     latest hardware and were working off incorrect documentation.  Fix
     up the NAND driver to get this correct.

   - Fix up device tree example documentation to use the latest
     recommendations for describing NAND ECC algorithms"

* tag 'for-linus-20160527' of git://git.infradead.org/linux-mtd:
  Documentation: dt: mtd: drop "soft_bch" from example
  Revert "mtd: atmel_nand: Support variable RB_EDGE interrupts"

Pull drm fixes from Dave Airlie:

 - one IMX built-in regression fix

 - a set of amdgpu fixes, mostly powerplay and polaris GPU stuff

 - a set of i915 fixes all over, many cc'ed to stable.

   The i915 batch contain support for DP++ dongle detection, which is
   used to fix some regressions in the HDMI color depth area

* tag 'drm-fixes-v4.7-rc1' of git://people.freedesktop.org/~airlied/linux: (44 commits)
  drm/amd: add Kconfig dependency for ACP on DRM_AMDGPU
  drm/amdgpu: Fix hdmi deep color support.
  drm/amdgpu: fix bug in fence driver fini
  drm/i915: Stop automatically retiring requests after a GPU hang
  drm/i915: Unify intel_ring_begin()
  drm/i915: Ignore stale wm register values on resume on ilk-bdw (v2)
  drm/i915/psr: Try to program link training times correctly
  drm/imx: Match imx-ipuv3-crtc components using device node in platform data
  drm/i915/bxt: Adjusting the error in horizontal timings retrieval
  drm/i915: Don't leave old junk in ilk active watermarks on readout
  drm/i915: s/DPPL/DPLL/ for SKL DPLLs
  drm/i915: Fix gen8 semaphores id for legacy mode
  drm/i915: Set crtc_state->lane_count for HDMI
  drm/i915/BXT: Retrieving the horizontal timing for DSI
  drm/i915: Protect gen7 irq_seqno_barrier with uncore lock
  drm/i915: Re-enable GGTT earlier during resume on pre-gen6 platforms
  drm/i915: Determine DP++ type 1 DVI adaptor presence based on VBT
  drm/i915: Enable/disable TMDS output buffers in DP++ adaptor as needed
  drm/i915: Respect DP++ adaptor TMDS clock limit
  drm: Add helper for DP++ adaptors
  ...

Merge tag 'platform-drivers-x86-v4.7-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform driver updates from Darren Hart:
 "Mostly minor updates and cleanups.  One new power management
  controller driver for Intel Core SoCs.

  platform/x86:
   - Add PMC Driver for Intel Core SoC

  dell-rbtn:
   - Ignore ACPI notifications if device is suspended

  thinkpad_acpi:
   - save kbdlight state on suspend and restore it on resume

  intel_menlow:
   - reduce code duplication

  asus-wmi:
   - provide access to ALS control

  ideapad-laptop:
   - add a new WMI string for ESC key

  surfacepro3_button:
   - Add a warning when switching to tablet mode

  sony-laptop:
   - Avoid oops on module unload for older laptops

  intel_telemetry:
   - Constify telemetry_core_ops structures

  fujitsu-laptop:
   - Use IS_ENABLED() instead of checking for built-in or module

  asus-laptop:
   - correct error handling in sysfs_acpi_set
   - remove redundant initializers
   - correct error handling in asus_read_brightness()

  fujitsu-laptop:
   - Support radio LED"

* tag 'platform-drivers-x86-v4.7-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
  platform/x86: Add PMC Driver for Intel Core SoC
  dell-rbtn: Ignore ACPI notifications if device is suspended
  thinkpad_acpi: save kbdlight state on suspend and restore it on resume
  intel_menlow: reduce code duplication
  asus-wmi: provide access to ALS control
  ideapad-laptop: add a new WMI string for ESC key
  surfacepro3_button: Add a warning when switching to tablet mode
  sony-laptop: Avoid oops on module unload for older laptops
  intel_telemetry: Constify telemetry_core_ops structures
  fujitsu-laptop: Use IS_ENABLED() instead of checking for built-in or module
  asus-laptop: correct error handling in sysfs_acpi_set
  asus-laptop: remove redundant initializers
  asus-laptop: correct error handling in asus_read_brightness()
  fujitsu-laptop: Support radio LED

Pull intel IOMMU updates from David Woodhouse:
 "This patchset improves the scalability of the Intel IOMMU code by
  resolving two spinlock bottlenecks and eliminating the linearity of
  the IOVA allocator, yielding up to ~5x performance improvement and
  approaching 'iommu=off' performance"

* git://git.infradead.org/intel-iommu:
  iommu/vt-d: Use per-cpu IOVA caching
  iommu/iova: introduce per-cpu caching to iova allocation
  iommu/vt-d: change intel-iommu to use IOVA frame numbers
  iommu/vt-d: avoid dev iotlb logic for domains with no dev iotlbs
  iommu/vt-d: only unmap mapped entries
  iommu/vt-d: correct flush_unmaps pfn usage
  iommu/vt-d: per-cpu deferred invalidation queues
  iommu/vt-d: refactoring of deferred flush entries

Pull second batch of KVM updates from Radim Krčmář:
 "General:

   - move kvm_stat tool from QEMU repo into tools/kvm/kvm_stat (kvm_stat
     had nothing to do with QEMU in the first place -- the tool only
     interprets debugfs)

   - expose per-vm statistics in debugfs and support them in kvm_stat
     (KVM always collected per-vm statistics, but they were summarised
     into global statistics)

  x86:

   - fix dynamic APICv (VMX was improperly configured and a guest could
     access host's APIC MSRs, CVE-2016-4440)

   - minor fixes

  ARM changes from Christoffer Dall:

   - new vgic reimplementation of our horribly broken legacy vgic
     implementation.  The two implementations will live side-by-side
     (with the new being the configured default) for one kernel release
     and then we'll remove the legacy one.

   - fix for a non-critical issue with virtual abort injection to guests"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (70 commits)
  tools: kvm_stat: Add comments
  tools: kvm_stat: Introduce pid monitoring
  KVM: Create debugfs dir and stat files for each VM
  MAINTAINERS: Add kvm tools
  tools: kvm_stat: Powerpc related fixes
  tools: Add kvm_stat man page
  tools: Add kvm_stat vm monitor script
  kvm:vmx: more complete state update on APICv on/off
  KVM: SVM: Add more SVM_EXIT_REASONS
  KVM: Unify traced vector format
  svm: bitwise vs logical op typo
  KVM: arm/arm64: vgic-new: Synchronize changes to active state
  KVM: arm/arm64: vgic-new: enable build
  KVM: arm/arm64: vgic-new: implement mapped IRQ handling
  KVM: arm/arm64: vgic-new: Wire up irqfd injection
  KVM: arm/arm64: vgic-new: Add vgic_v2/v3_enable
  KVM: arm/arm64: vgic-new: vgic_init: implement map_resources
  KVM: arm/arm64: vgic-new: vgic_init: implement vgic_init
  KVM: arm/arm64: vgic-new: vgic_init: implement vgic_create
  KVM: arm/arm64: vgic-new: vgic_init: implement kvm_vgic_hyp_init
  ...

preparation for similar switch in ->setxattr() (see the next commit for
rationale).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

This patch adds the Power Management Controller driver as a PCI driver
for Intel Core SoC architecture.

This driver can utilize debugging capabilities and supported features
as exposed by the Power Management Controller.

Please refer to the below specification for more details on PMC features.
http://www.intel.in/content/www/in/en/chipsets/100-series-chipset-datasheet-vol-2.html

The current version of this driver exposes SLP_S0_RESIDENCY counter.
This counter can be used for detecting fragile SLP_S0 signal related
failures and take corrective actions when PCH SLP_S0 signal is not
asserted after kernel freeze as part of suspend to idle flow
(echo freeze > /sys/power/state).

Intel Platform Controller Hub (PCH) asserts SLP_S0 signal when it
detects favorable conditions to enter its low power mode. As a
pre-requisite the SoC should be in deepest possible Package C-State
and devices should be in low power mode. For example, on Skylake SoC
the deepest Package C-State is Package C10 or PC10. Suspend to idle
flow generally leads to PC10 state but PC10 state may not be sufficient
for realizing the platform wide power potential which SLP_S0 signal
assertion can provide.

SLP_S0 signal is often connected to the Embedded Controller (EC) and the
Power Management IC (PMIC) for other platform power management related
optimizations.

In general, SLP_S0 assertion == PC10 + PCH low power mode + ModPhy Lanes
power gated + PLL Idle.

As part of this driver, a mechanism to read the SLP_S0_RESIDENCY is exposed
as an API and also debugfs features are added to indicate SLP_S0 signal
assertion residency in microseconds.

echo freeze > /sys/power/state
wake the system
cat /sys/kernel/debug/pmc_core/slp_s0_residency_usec
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Signed-off-by: Vishwanath Somayaji <vishwanath.somayaji@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>