linux-stable.git/tools/testing/selftests/vm/userfaultfd.c, branch linux-4.3.y

userfaultfd: selftest: don't error out if pthread_mutex_t isn't identical

2015-09-22T22:09:53+00:00

On ppc big endian this check fails, the mutex doesn't necessarily need
to be identical for all pages after pthread_mutex_lock/unlock cycles.
The count verification (outside of the pthread_mutex_t structure)
suffices and that is retained.

Signed-off-by: Andrea Arcangeli 
Cc: Dr. David Alan Gilbert 
Cc: Michael Ellerman 
Cc: Shuah Khan 
Cc: Thierry Reding 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftest: return an error if BOUNCE_VERIFY fails

2015-09-22T22:09:53+00:00

This will report the error in the exit code, in addition of the fprintf.

Signed-off-by: Andrea Arcangeli 
Cc: Dr. David Alan Gilbert 
Cc: Michael Ellerman 
Cc: Shuah Khan 
Cc: Thierry Reding 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftest: avoid my_bcmp false positives with powerpc

2015-09-22T22:09:53+00:00

Keep a non-zero placeholder after the count, for the my_bcmp comparison
of the page against the zeropage.  The lockless increment between 255 to
256 against a lockless my_bcmp could otherwise return false positives on
ppc32le.

Signed-off-by: Andrea Arcangeli 
Tested-by: Michael Ellerman 
Cc: Dr. David Alan Gilbert 
Cc: Shuah Khan 
Cc: Thierry Reding 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftest: only warn if __NR_userfaultfd is undefined

2015-09-22T22:09:53+00:00

If __NR_userfaultfd is not yet defined by the arch, warn but still build
and run the userfaultfd selftest successfully.

Signed-off-by: Michael Ellerman 
Signed-off-by: Andrea Arcangeli 
Cc: Dr. David Alan Gilbert 
Cc: Shuah Khan 
Cc: Thierry Reding 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftest: headers fixup

2015-09-22T22:09:53+00:00

Depend on "make headers_install" to create proper headers to include and
provide syscall numbers.

Signed-off-by: Andrea Arcangeli 
Cc: Dr. David Alan Gilbert 
Cc: Michael Ellerman 
Cc: Shuah Khan 
Cc: Thierry Reding 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftests: vm: pick up sanitized kernel headers

2015-09-22T22:09:53+00:00

Add the usr/include subdirectory of the top-level tree to the include
path, and make sure to include headers without relative paths to make
sure the sanitized headers get picked up.  Otherwise the compiler will
not be able to find the linux/compiler.h header included by the non-
sanitized include/uapi/linux/userfaultfd.h.

While at it, make sure to only hardcode the syscall numbers on x86 and
PowerPC if they haven't been properly picked up from the headers.

Signed-off-by: Thierry Reding 
Acked-by: Michael Ellerman 
Cc: Shuah Khan 
Signed-off-by: Andrea Arcangeli 
Cc: Dr. David Alan Gilbert 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

s390: wire up userfaultfd system call

2015-09-17T11:43:43+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

Merge branch 'akpm' (patches from Andrew)

2015-09-09T00:52:23+00:00

Merge second patch-bomb from Andrew Morton:
 "Almost all of the rest of MM.  There was an unusually large amount of
  MM material this time"

* emailed patches from Andrew Morton : (141 commits)
  zpool: remove no-op module init/exit
  mm: zbud: constify the zbud_ops
  mm: zpool: constify the zpool_ops
  mm: swap: zswap: maybe_preload & refactoring
  zram: unify error reporting
  zsmalloc: remove null check from destroy_handle_cache()
  zsmalloc: do not take class lock in zs_shrinker_count()
  zsmalloc: use class->pages_per_zspage
  zsmalloc: consider ZS_ALMOST_FULL as migrate source
  zsmalloc: partial page ordering within a fullness_list
  zsmalloc: use shrinker to trigger auto-compaction
  zsmalloc: account the number of compacted pages
  zsmalloc/zram: introduce zs_pool_stats api
  zsmalloc: cosmetic compaction code adjustments
  zsmalloc: introduce zs_can_compact() function
  zsmalloc: always keep per-class stats
  zsmalloc: drop unused variable `nr_to_migrate'
  mm/memblock.c: fix comment in __next_mem_range()
  mm/page_alloc.c: fix type information of memoryless node
  memory-hotplug: fix comments in zone_spanned_pages_in_node() and zone_spanned_pages_in_node()
  ...

selftests/userfaultfd: fix compiler warnings on 32-bit

2015-09-08T22:35:28+00:00

On 32-bit:

    userfaultfd.c: In function 'locking_thread':
    userfaultfd.c:152: warning: left shift count >= width of type
    userfaultfd.c: In function 'uffd_poll_thread':
    userfaultfd.c:295: warning: cast to pointer from integer of different size
    userfaultfd.c: In function 'uffd_read_thread':
    userfaultfd.c:332: warning: cast to pointer from integer of different size

Fix the shift warning by splitting the shift in two parts, and the
integer/pointer warnigns by adding intermediate casts to "unsigned long".

Signed-off-by: Geert Uytterhoeven 
Cc: Andrea Arcangeli 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: selftest: update userfaultfd x86 32bit syscall number

2015-09-08T18:14:39+00:00

It changed as result of other syscalls, and while the system call list
itself was correctly updated, the selftest program was not.

Signed-off-by: Andrea Arcangeli 
Cc: Andrew Morton 
Cc: Stephen Rothwell 
Cc: Thomas Gleixner 
Cc: Andy Lutomirski 
Signed-off-by: Linus Torvalds