tmp_suning_uos_patched/include
Tejun Heo 5f820f648c poll: allow f_op->poll to sleep
f_op->poll is the only vfs operation which is not allowed to sleep.  It's
because poll and select implementation used task state to synchronize
against wake ups, which doesn't have to be the case anymore as wait/wake
interface can now use custom wake up functions.  The non-sleep restriction
can be a bit tricky because ->poll is not called from an atomic context
and the result of accidentally sleeping in ->poll only shows up as
temporary busy looping when the timing is right or rather wrong.

This patch converts poll/select to use custom wake up function and use
separate triggered variable to synchronize against wake up events.  The
only added overhead is an extra function call during wake up and
negligible.

This patch removes the one non-sleep exception from vfs locking rules and
is beneficial to userland filesystem implementations like FUSE, 9p or
peculiar fs like spufs as it's very difficult for those to implement
non-sleeping poll method.

While at it, make the following cosmetic changes to make poll.h and
select.c checkpatch friendly.

* s/type * symbol/type *symbol/		   : three places in poll.h
* remove blank line before EXPORT_SYMBOL() : two places in select.c

Oleg: spotted missing barrier in poll_schedule_timeout()
Davide: spotted missing write barrier in pollwake()

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Brad Boyer <flar@allandria.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Roland McGrath <roland@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-06 15:59:12 -08:00
..
acpi cpumask: convert shared_cpu_map in acpi_processor* structs to cpumask_var_t 2009-01-03 19:15:40 +01:00
asm-arm
asm-frv atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
asm-generic mm: remove CONFIG_OUT_OF_LINE_PFN_TO_PAGE 2009-01-06 15:59:10 -08:00
asm-h8300
asm-m32r atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
asm-m68k atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
asm-mn10300 atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
asm-xtensa atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
crypto crypto: aes - Precompute tables 2008-12-25 11:05:13 +11:00
drm drm: Add a debug node for vblank state. 2008-12-29 17:47:27 +10:00
keys
linux poll: allow f_op->poll to sleep 2009-01-06 15:59:12 -08:00
math-emu
media V4L/DVB (10141): v4l2: debugging API changed to match against driver name instead of ID. 2009-01-02 17:11:52 -02:00
mtd
net ipv6: Fix sporadic sendmsg -EINVAL when sending to multicast groups. 2009-01-04 16:04:39 -08:00
pcmcia
rdma
rxrpc
scsi [SCSI] fcoe: Fibre Channel over Ethernet 2008-12-29 11:24:33 -06:00
sound V4L/DVB (10135): v4l2: introduce v4l2_file_operations. 2009-01-02 17:11:12 -02:00
trace sched, trace: update trace_sched_wakeup() 2008-12-25 13:10:21 +01:00
video video: sh_mobile_lcdcfb deferred io support 2008-12-22 18:44:48 +09:00
xen xen: clean up asm/xen/hypervisor.h 2008-12-16 21:50:31 +01:00
Kbuild