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Nelson Elhage d8805e633e epoll: fix spurious lockdep warnings 
epoll can acquire recursively acquire ep->mtx on multiple "struct
eventpoll"s at once in the case where one epoll fd is monitoring another
epoll fd.  This is perfectly OK, since we're careful about the lock
ordering, but it causes spurious lockdep warnings.  Annotate the recursion
using mutex_lock_nested, and add a comment explaining the nesting rules
for good measure.

Recent versions of systemd are triggering this, and it can also be
demonstrated with the following trivial test program:

--------------------8<--------------------

int main(void) {
   int e1, e2;
   struct epoll_event evt = {
       .events = EPOLLIN
   };

   e1 = epoll_create1(0);
   e2 = epoll_create1(0);
   epoll_ctl(e1, EPOLL_CTL_ADD, e2, &evt);
   return 0;
}
--------------------8<--------------------

Reported-by: Paul Bolle <pebolle@tiscali.nl>
Tested-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Nelson Elhage <nelhage@nelhage.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2011-10-31 17:30:57 -07:00
..
9p net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
adfs
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affs
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afs
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autofs4
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befs
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bfs
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btrfs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
cachefiles
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ceph libceph: fix double-free of page vector 2011-10-25 16:10:17 -07:00
cifs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
coda
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configfs
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cramfs
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debugfs
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devpts
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dlm
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ecryptfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
efs
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exofs ore: Enable RAID5 mounts 2011-10-24 17:22:29 -07:00
exportfs
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ext2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ext3 Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-security 2011-10-25 09:45:31 +02:00
ext4 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
fat fat: follow rename pack_hex_byte() to hex_byte_pack() 2011-10-31 17:30:57 -07:00
freevxfs
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fscache
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fuse
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gfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
hfs
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hfsplus
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hostfs
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hpfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
hppfs
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hugetlbfs
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isofs
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jbd
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jbd2
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jffs2
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jfs Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-security 2011-10-25 09:45:31 +02:00
lockd
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logfs lib/string.c: introduce memchr_inv() 2011-10-31 17:30:47 -07:00
minix
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ncpfs
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nfs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue 2011-10-28 10:49:34 -07:00
nfs_common
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nfsd nfs41: implement DESTROY_CLIENTID operation 2011-10-24 04:24:30 -04:00
nilfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
nls
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notify
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ntfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ocfs2 treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
omfs
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openpromfs
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partitions treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
proc mm: distinguish between mlocked and pinned pages 2011-10-31 17:30:46 -07:00
pstore
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qnx4
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quota
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ramfs
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reiserfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
romfs
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squashfs
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sysfs sysfs: Remove support for tagged directories with untagged members (again) 2011-10-25 15:10:28 +02:00
sysv
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ubifs
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udf treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
ufs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
xfs treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
Kconfig tmpfs: add "tmpfs" to the Kconfig prompt to make it obvious. 2011-10-31 17:30:45 -07:00
Kconfig.binfmt
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Makefile fs/Makefile: Stupid typo breakage of exofs inclusion 2011-10-27 08:36:51 +02:00
aio.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
anon_inodes.c
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attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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bio-integrity.c
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bio.c
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block_dev.c
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buffer.c fs/buffer.c: add device information for error output in __find_get_block_slow() 2011-10-31 17:30:49 -07:00
char_dev.c
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compat.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
compat_binfmt_elf.c
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compat_ioctl.c
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dcache.c
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dcookies.c
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direct-io.c direct-io: merge direct_io_walker into __blockdev_direct_IO 2011-10-28 14:58:58 +02:00
drop_caches.c
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eventfd.c
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eventpoll.c epoll: fix spurious lockdep warnings 2011-10-31 17:30:57 -07:00
exec.c oom: remove oom_disable_count 2011-10-31 17:30:45 -07:00
fcntl.c
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fhandle.c
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fifo.c
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file.c
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file_table.c
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filesystems.c
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fs-writeback.c
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fs_struct.c
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generic_acl.c
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inode.c vfs: fix spinning prevention in prune_icache_sb 2011-10-28 14:58:55 +02:00
internal.h
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ioctl.c
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ioprio.c
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libfs.c
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locks.c Merge branch 'for-3.2' of git://linux-nfs.org/~bfields/linux 2011-10-25 15:42:01 +02:00
mbcache.c
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mpage.c
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namei.c leases: fix write-open/read-lease race 2011-10-28 14:59:00 +02:00
namespace.c vfs: add "device" tag to /proc/self/mountstats 2011-10-28 13:55:08 +02:00
no-block.c
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open.c leases: fix write-open/read-lease race 2011-10-28 14:59:00 +02:00
pipe.c fs/pipe.c: add ->statfs callback for pipefs 2011-10-31 17:30:51 -07:00
pnode.c
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pnode.h
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posix_acl.c vfs: pass all mask flags check_acl and posix_acl_permission 2011-10-28 14:58:54 +02:00
read_write.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
read_write.h
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readdir.c
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select.c
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seq_file.c
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signalfd.c
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splice.c
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stack.c
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stat.c
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statfs.c
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super.c vmscan: fix shrinker callback bug in fs/super.c 2011-10-31 17:30:49 -07:00
sync.c
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timerfd.c
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utimes.c
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xattr.c
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xattr_acl.c
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