From: Oleg Nesterov <oleg@redhat.com>
Date: Sat, 11 Jan 2014 18:19:53 +0000 (+0100)
Subject: change close_files() to use rcu_dereference_raw(files->fdt)
X-Git-Tag: v3.14-rc1~78^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce08b62d18b3f97cd4e5a39bd5898872b9201875;p=pandora-kernel.git

change close_files() to use rcu_dereference_raw(files->fdt)

put_files_struct() and close_files() do rcu_read_lock() to make
rcu_dereference_check_fdtable() happy.

This looks a bit ugly, files_fdtable() just reads the pointer,
we can simply use rcu_dereference_raw() to avoid the warning.

The patch also changes close_files() to return fdt, this avoids
another rcu_read_lock()/files_fdtable() in put_files_struct().

I think close_files() needs more cleanups:

	- we do not need xchg() exactly because we are the last
	  user of this files_struct

	- "if (file)" should be turned into WARN_ON(!file)

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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