From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 24 Jun 2012 05:56:45 +0000 (+0400)
Subject: switch fput to task_work_add
X-Git-Tag: v3.6-rc1~152^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a9d4b024a3102fc083c925c242d98ac27b1c5f6;p=pandora-kernel.git

switch fput to task_work_add

... and schedule_work() for interrupt/kernel_thread callers
(and yes, now it *is* OK to call from interrupt).

We are guaranteed that __fput() will be done before we return
to userland (or exit).  Note that for fput() from a kernel
thread we get an async behaviour; it's almost always OK, but
sometimes you might need to have __fput() completed before
you do anything else.  There are two mechanisms for that -
a general barrier (flush_delayed_fput()) and explicit
__fput_sync().  Both should be used with care (as was the
case for fput() from kernel threads all along).  See comments
in fs/file_table.c for details.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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