From: Nikita Danilov <nikita@clusterfs.com>
Date: Fri, 6 Jan 2006 08:11:08 +0000 (-0800)
Subject: [PATCH] find_lock_page(): call __lock_page() directly.
X-Git-Tag: v2.6.16-rc1~936^2~252
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbfbb7cec9dd7266534b2b4b9c8be2fa425bbfc9;p=pandora-kernel.git

[PATCH] find_lock_page(): call __lock_page() directly.

As find_lock_page() already checks with TestSetPageLocked() that page is
locked, there is no need to call lock_page() that will try-lock page again
(chances of page being unlocked in between are small).  Call __lock_page()
directly, this saves one atomic operation.

Also, mark truncate-while-slept path as unlikely while we are here.

(akpm: ug.  But this is actually a common path for normal old read()s against
a page which is under readahead I/O so ho-hum.)

Signed-off-by: Nikita Danilov <danilov@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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