KAMEZAWA Hiroyuki 9e7814404b hold task->mempolicy while numa_maps scans. ...

/proc/<pid>/numa_maps scans vma and show mempolicy under
  mmap_sem. It sometimes accesses task->mempolicy which can
  be freed without mmap_sem and numa_maps can show some
  garbage while scanning.

This patch tries to take reference count of task->mempolicy at reading
numa_maps before calling get_vma_policy(). By this, task->mempolicy
will not be freed until numa_maps reaches its end.

V2->v3
  -  updated comments to be more verbose.
  -  removed task_lock() in numa_maps code.
V1->V2
  -  access task->mempolicy only once and remember it.  Becase kernel/exit.c
     can overwrite it.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-10-19 14:32:10 -07:00

..

9p

The following changes since commit 4cbe5a555fa58a79b6ecbb6c531b8bab0650778d:

2012-10-12 09:59:23 +09:00

adfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

affs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

afs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

autofs4

autofs4 - fix reset pending flag on mount fail

2012-10-11 10:21:16 +09:00

befs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

bfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

btrfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-10-13 13:23:39 -07:00

cachefiles

fs: cachefiles: add support for large files in filesystem caching

2012-07-30 17:25:21 -07:00

ceph

tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking

2012-10-09 23:33:55 -04:00

cifs

Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2012-10-14 13:39:34 -07:00

coda

fs: push rcu_barrier() from deactivate_locked_super() to filesystems

2012-10-02 21:35:55 -04:00

configfs

userns: Convert configfs to use kuid and kgid where appropriate

2012-09-18 01:01:37 -07:00

cramfs

userns: Convert cramfs to use kuid/kgid where appropriate

2012-09-21 03:13:08 -07:00

debugfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-10-02 11:11:09 -07:00

devpts

VFS: Pass mount flags to sget()

2012-07-14 16:38:34 +04:00

dlm

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2012-10-02 13:38:27 -07:00

ecryptfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

efs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

exofs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-12 10:52:03 +09:00

exportfs

switch dentry_open() to struct path, make it grab references itself

2012-07-23 00:01:29 +04:00

ext2

ext2: fix return values on parse_options() failure

2012-10-09 23:23:53 +02:00

ext3

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2012-10-16 18:12:38 -07:00

ext4

mm: kill vma flag VM_CAN_NONLINEAR

2012-10-09 16:22:17 +09:00

fat

fat: drop lock/unlock super

2012-10-09 23:33:38 -04:00

freevxfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

fscache

…

fuse

mm: kill vma flag VM_CAN_NONLINEAR

2012-10-09 16:22:17 +09:00

gfs2

tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking

2012-10-09 23:33:55 -04:00

hfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

hfsplus

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

hostfs

Merge branch 'for-linus-37rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2012-10-10 11:15:20 +09:00

hpfs

hpfs: drop lock/unlock super

2012-10-09 23:33:38 -04:00

hppfs

hppfs: fix the return value of get_inode()

2012-10-09 22:34:52 +02:00

hugetlbfs

mm: replace vma prio_tree with an interval tree

2012-10-09 16:22:39 +09:00

isofs

tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking

2012-10-09 23:33:55 -04:00

jbd

jbd: Fix assertion failure in commit code due to lacking transaction credits

2012-09-12 15:52:03 +02:00

jbd2

The big new feature added this time is supporting online resizing

2012-10-08 06:36:39 +09:00

jffs2

UAPI Disintegration 2012-10-09

2012-10-09 15:04:25 +01:00

jfs

JFS TRIM support and some minor fixes

2012-10-03 08:48:21 -07:00

lockd

NLM: nlm_lookup_file() may return NLMv4-specific error codes

2012-10-17 10:14:14 -04:00

logfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

minix

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

ncpfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

nfs

Merge branch 'for-3.7' of git://linux-nfs.org/~bfields/linux

2012-10-13 10:53:54 +09:00

nfs_common

…

nfsd

UAPI Disintegration 2012-10-09

2012-10-09 18:35:22 -04:00

nilfs2

mm: kill vma flag VM_CAN_NONLINEAR

2012-10-09 16:22:17 +09:00

nls

nls: fix (and rename) mac NLS table files and config options

2012-06-01 19:51:22 -07:00

notify

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

ntfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

ocfs2

mm: kill vma flag VM_CAN_NONLINEAR

2012-10-09 16:22:17 +09:00

omfs

omfs: convert to use beXX_add_cpu()

2012-10-06 03:05:31 +09:00

openpromfs

fs: push rcu_barrier() from deactivate_locked_super() to filesystems

2012-10-02 21:35:55 -04:00

proc

hold task->mempolicy while numa_maps scans.

2012-10-19 14:32:10 -07:00

pstore

pstore: Avoid recursive spinlocks in the oops_in_progress case

2012-09-20 17:04:50 -07:00

qnx4

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

qnx6

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

quota

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2012-10-16 18:12:38 -07:00

ramfs

don't pass nameidata to ->create()

2012-07-14 16:34:47 +04:00

reiserfs

tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking

2012-10-09 23:33:55 -04:00

romfs

fs: push rcu_barrier() from deactivate_locked_super() to filesystems

2012-10-02 21:35:55 -04:00

squashfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

sysfs

sysfs: Fix comment typo "sysf_create_link".

2012-09-04 16:11:31 -07:00

sysv

sysv: drop lock/unlock super

2012-10-09 23:33:39 -04:00

ubifs

mm: kill vma flag VM_CAN_NONLINEAR

2012-10-09 16:22:17 +09:00

udf

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2012-10-04 09:14:01 -07:00

ufs

ufs: drop lock/unlock super

2012-10-09 23:33:39 -04:00

xfs

tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking

2012-10-09 23:33:55 -04:00

aio.c

aio: now fput() is OK from interrupt context; get rid of manual delayed __fput()

2012-07-22 23:57:59 +04:00

anon_inodes.c

anon_inodes: move allocation of anon_inode into ->mount()

2012-03-20 21:29:45 -04:00

attr.c

ima: add inode_post_setattr call

2012-09-07 14:57:46 -04:00

bad_inode.c

don't pass nameidata to ->create()

2012-07-14 16:34:47 +04:00

binfmt_aout.c

coredump: pass siginfo_t* to do_coredump() and below, not merely signr

2012-10-06 03:05:16 +09:00

binfmt_elf_fdpic.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2012-10-10 12:02:25 +09:00

binfmt_elf.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2012-10-10 12:02:25 +09:00

binfmt_em86.c

__register_binfmt() made void

2012-03-20 21:29:46 -04:00

binfmt_flat.c

coredump: pass siginfo_t* to do_coredump() and below, not merely signr

2012-10-06 03:05:16 +09:00

binfmt_misc.c

vfs: Rename end_writeback() to clear_inode()

2012-05-06 13:43:41 +08:00

binfmt_script.c

__register_binfmt() made void

2012-03-20 21:29:46 -04:00

binfmt_som.c

VM: add "vm_mmap()" helper function

2012-04-20 17:29:13 -07:00

bio-integrity.c

block: Ues bi_pool for bio_integrity_alloc()

2012-09-09 10:35:38 +02:00

bio.c

block: makes bio_split support bio without data

2012-09-28 10:38:48 +02:00

block_dev.c

Merge branch 'for-3.7/core' of git://git.kernel.dk/linux-block

2012-10-11 09:04:23 +09:00

buffer.c

The big new feature added this time is supporting online resizing

2012-10-08 06:36:39 +09:00

char_dev.c

char_dev.c: fix up some whitespace errors

2011-12-13 11:18:17 -08:00

compat_binfmt_elf.c

coredump: extend core dump note section to contain file names of mapped files

2012-10-06 03:05:17 +09:00

compat_ioctl.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

compat.c

vfs: define struct filename and have getname() return it

2012-10-12 20:14:55 -04:00

coredump.c

fix a leak in replace_fd() users

2012-10-16 13:36:50 -04:00

coredump.h

coredump: update coredump-related headers

2012-10-06 03:05:15 +09:00

dcache.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

dcookies.c

fs: reduce the use of module.h wherever possible

2012-02-28 19:31:58 -05:00

direct-io.c

block: move down direct IO plugging

2012-08-09 15:23:09 +02:00

drop_caches.c

…

eventfd.c

eventfd: change int to __u64 in eventfd_signal()

2012-05-31 17:49:32 -07:00

eventpoll.c

epoll: support for disabling items, and a self-test app

2012-10-06 03:05:00 +09:00

exec.c

vfs: make path_openat take a struct filename pointer

2012-10-12 20:15:09 -04:00

fcntl.c

Fix F_DUPFD_CLOEXEC breakage

2012-10-09 15:52:31 +09:00

fhandle.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

fifo.c

fifo: Do not restart open() if it already found a partner

2012-07-16 08:33:14 -07:00

file_table.c

lglock: add DEFINE_STATIC_LGLOCK()

2012-10-10 01:15:44 -04:00

file.c

dup3: Return an error when oldfd == newfd.

2012-10-09 23:33:38 -04:00

filesystems.c

vfs: define struct filename and have getname() return it

2012-10-12 20:14:55 -04:00

fs_struct.c

get rid of ->mnt_longterm

2012-07-14 16:32:47 +04:00

fs-writeback.c

Merge branch 'writeback-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

2012-10-12 10:46:03 +09:00

generic_acl.c

userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr

2012-09-18 01:01:35 -07:00

inode.c

mm: replace vma prio_tree with an interval tree

2012-10-09 16:22:39 +09:00

internal.h

vfs: make path_openat take a struct filename pointer

2012-10-12 20:15:09 -04:00

ioctl.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

ioprio.c

Merge branch 'for-3.5/core' of git://git.kernel.dk/linux-block

2012-05-30 08:52:42 -07:00

Kconfig

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-03-21 13:36:41 -07:00

Kconfig.binfmt

coredump: make core dump functionality optional

2012-10-06 03:05:15 +09:00

libfs.c

vfs: fix kerneldoc for generic_fh_to_parent()

2012-09-05 10:59:30 +02:00

locks.c

UAPI Disintegration 2012-10-09

2012-10-09 18:35:22 -04:00

Makefile

coredump: make core dump functionality optional

2012-10-06 03:05:15 +09:00

mbcache.c

…

mount.h

get rid of magic in proc_namespace.c

2012-07-14 16:32:48 +04:00

mpage.c

fs: reduce the use of module.h wherever possible

2012-02-28 19:31:58 -05:00

namei.c

vfs: embed struct filename inside of names_cache allocation if possible

2012-10-12 20:15:10 -04:00

namespace.c

vfs: define struct filename and have getname() return it

2012-10-12 20:14:55 -04:00

no-block.c

…

open.c

vfs: make path_openat take a struct filename pointer

2012-10-12 20:15:09 -04:00

pipe.c

pipe(2) - race-free error recovery

2012-09-26 21:08:52 -04:00

pnode.c

VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors

2012-07-14 16:37:27 +04:00

pnode.h

vfs: switch pnode.h macros to struct mount *

2012-01-03 22:57:11 -05:00

posix_acl.c

userns: Convert vfs posix_acl support to use kuids and kgids

2012-09-18 01:01:35 -07:00

proc_namespace.c

get rid of magic in proc_namespace.c

2012-07-14 16:32:48 +04:00

read_write.c

compat: fs: Generic compat_sys_sendfile implementation

2012-10-02 21:35:55 -04:00

read_write.h

compat: fs: Generic compat_sys_sendfile implementation

2012-10-02 21:35:55 -04:00

readdir.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

select.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

seq_file.c

userns: Make seq_file's user namespace accessible

2012-08-14 21:47:55 -07:00

signalfd.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

splice.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

stack.c

fs: reduce the use of module.h wherever possible

2012-02-28 19:31:58 -05:00

stat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2012-10-02 20:25:04 -07:00

statfs.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

super.c

vfs: drop lock/unlock super

2012-10-09 23:33:39 -04:00

sync.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

timerfd.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

utimes.c

switch simple cases of fget_light to fdget

2012-09-26 22:20:08 -04:00

xattr_acl.c

userns: Fix posix_acl_file_xattr_userns gid conversion

2012-10-12 13:16:48 -07:00

xattr.c

fs, xattr: fix bug when removing a name not in xattr list

2012-10-18 12:35:58 -07:00