From: David Howells <dhowells@redhat.com>
Date: Fri, 24 Jun 2005 05:00:53 +0000 (-0700)
Subject: [PATCH] Keys: Use RCU to manage session keyring pointer
X-Git-Tag: v2.6.13-rc1~68^2~377
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8589b4e00e352f983259140f25a262d973be6bc5;p=pandora-kernel.git

[PATCH] Keys: Use RCU to manage session keyring pointer

The attached patch uses RCU to manage the session keyring pointer in struct
signal_struct.  This means that searching need not disable interrupts and get
a the sighand spinlock to access this pointer.  Furthermore, by judicious use
of rcu_read_(un)lock(), this patch also avoids the need to take and put
refcounts on the session keyring itself, thus saving on even more atomic ops.

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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