pipe: make account_pipe_buffers() return a value, and use it

This is an optional patch, to provide a small performance
improvement.  Alter account_pipe_buffers() so that it returns the
new value in user->pipe_bufs. This means that we can refactor
too_many_pipe_buffers_soft() and too_many_pipe_buffers_hard() to
avoid the costs of repeated use of atomic_long_read() to get the
value user->pipe_bufs.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michael Kerrisk <[email protected]>
Reviewed-by: Vegard Nossum <[email protected]>
Cc: Willy Tarreau <[email protected]>
Cc: <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions