tree 2404fc0d346127b71b9c30d9f9c95603c652ac93
parent 25a80759c5c237f0ecf57eb11fdd4efb21079c88
author David Howells <dhowells@redhat.com> 1144734866 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1144761525 -0700

[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>