linux-stable.git/drivers/staging/android/ashmem.c, branch v3.5

mm/fs: route MADV_REMOVE to FALLOC_FL_PUNCH_HOLE

2012-05-29T23:22:22+00:00

Now tmpfs supports hole-punching via fallocate(), switch madvise_remove()
to use do_fallocate() instead of vmtruncate_range(): which extends
madvise(,,MADV_REMOVE) support from tmpfs to ext4, ocfs2 and xfs.

There is one more user of vmtruncate_range() in our tree,
staging/android's ashmem_shrink(): convert it to use do_fallocate() too
(but if its unpinned areas are already unmapped - I don't know - then it
would do better to use shmem_truncate_range() directly).

Based-on-patch-by: Cong Wang 
Signed-off-by: Hugh Dickins 
Cc: Christoph Hellwig 
Cc: Al Viro 
Cc: Colin Cross 
Cc: John Stultz 
Cc: Greg Kroah-Hartman 
Cc: "Theodore Ts'o" 
Cc: Andreas Dilger 
Cc: Mark Fasheh 
Cc: Joel Becker 
Cc: Dave Chinner 
Cc: Ben Myers 
Cc: Michael Kerrisk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[media] mm/drivers: use vm_flags_t for vma flags

2012-04-10T18:44:21+00:00

Signed-off-by: Konstantin Khlebnikov 
Cc: linux-media@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Cc: Laurent Pinchart 
Cc: Mauro Carvalho Chehab 
Cc: Greg Kroah-Hartman 
Cc: John Stultz 
Cc: "Arve Hjønnevåg" 
Acked-by: Laurent Pinchart 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Mauro Carvalho Chehab

drivers/staging/android/ashmem.c: Cleanups

2012-02-09T00:47:51+00:00

Minor cleanups that consist of removal of a whitespace and
make file_operations const.

Signed-off-by: Tracey Dent 
Signed-off-by: Greg Kroah-Hartman

ashmem: Whitespace cleanups

2011-12-21T21:40:25+00:00

Fixes checkpatch warnings with the ashmem.c file

CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Fix arguments to ashmem_shrink

2011-12-21T21:40:24+00:00

The arguments to shrink functions have changed, update
ashmem_shrink to match.

Signed-off-by: Colin Cross 
[jstultz: tweaked commit subject]
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Support lseek(2) in ashmem driver

2011-12-21T21:40:24+00:00

Signed-off-by: Bjorn Bringert 
[jstultz: tweaked commit subject]
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Update arguments of shrinker for 2.6.35

2011-12-21T21:40:23+00:00

Signed-off-by: Colin Cross 
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Fix ASHMEM_SET_PROT_MASK.

2011-12-21T21:40:23+00:00

Signed-off-by: Arve Hjønnevåg 
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Implement read(2) in ashmem driver

2011-12-21T21:40:22+00:00

Signed-off-by: Bjorn Bringert 
[jstultz: Tweaked commit subject]
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman

ashmem: Anonymous shared memory subsystem

2011-12-21T21:38:28+00:00

The anonymous shared memory (ashmem) subsystem provides a
Unix-y,file-based shared memory interface to user-space. It
works like anonymous memory (e.g. mmapping fd=0) except if
you share the file descriptor via the usual means, you will
share the mapping. The shared memory can be accessed via both
mmap or file I/O. The backing store is a simple shmem file.

Additionally, ashmem introduces the concept of page pinning.
Pinned pages (the default) behave like any anonymous memory.
Unpinned pages are available to the kernel for eviction during
VM pressure. When repinning the pages, the return value
instructs user-space as to any eviction. In this manner,
user-space processes may implement caching and similar
resource management that efficiently integrates with kernel
memory management.

Signed-off-by: Robert Love 

ashmem: Don't install fault handler for private mmaps.

Ashmem is used to create named private heaps. If this heap is backed
by a tmpfs file it will allocate two pages for every page touched.
In 2.6.27, the extra page would later be freed, but 2.6.29 does not
scan anonymous pages when running without swap so the memory is not
freed while the file is referenced. This change changes the behavior
of private ashmem mmaps to match /dev/zero instead tmpfs.

Signed-off-by: Arve Hjønnevåg 

ashmem: Add common prefix to name reported in /proc/pid/maps

Signed-off-by: Arve Hjønnevåg 

ashmem: don't require a page aligned size

This makes ashmem more similar to shmem and mmap, by
not requiring the specified size to be page aligned,
instead rounding it internally as needed.

Signed-off-by: Marco Nelissen 
[jstultz: Improved commit subject and included patch description
from rlove. Also moved ashmem files to staging dir, and reworked
code to avoid touching mm/shmem.c while we're in staging.]
CC: Brian Swetland 
CC: Colin Cross 
CC: Arve Hjønnevåg 
CC: Dima Zavin 
CC: Robert Love 
Signed-off-by: John Stultz 
Signed-off-by: Greg Kroah-Hartman