From: David Howells <dhowells@redhat.com>
Date: Tue, 11 Apr 2006 05:54:26 +0000 (-0700)
Subject: [PATCH] Keys: Improve usage of memory barriers and remove IRQ disablement
X-Git-Tag: v2.6.17-rc2~179
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a26feb9622f1b1bc5e4f5f60f65557b73c38cbf;p=pandora-kernel.git

[PATCH] Keys: Improve usage of memory barriers and remove IRQ disablement

Remove an unnecessary memory barrier (implicit in rcu_dereference()) from
install_session_keyring().

install_session_keyring() is also rearranged a little to make it slightly
more efficient.

As install_*_keyring() may schedule (in synchronize_rcu() or
keyring_alloc()), they may not be entered with interrupts disabled - and so
there's no point saving the interrupt disablement state over the critical
section.

exec_keys() will also be invoked with interrupts enabled, and so that doesn't
need to save the interrupt state either.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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