From: Fengguang Wu <wfg@mail.ustc.edu.cn>
Date: Tue, 16 Oct 2007 08:24:35 +0000 (-0700)
Subject: readahead: remove the local copy of ra in do_generic_mapping_read()
X-Git-Tag: v2.6.24-rc1~1232
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ff81078d8b9f3d05a27b7bd3786ffb1ef1b0d1f;p=pandora-kernel.git

readahead: remove the local copy of ra in do_generic_mapping_read()

The local copy of ra in do_generic_mapping_read() can now go away.

It predates readanead(req_size).  In a time when the readahead code was called
on *every* single page.  Hence a local has to be made to reduce the chance of
the readahead state being overwritten by a concurrent reader.  More details
in: Linux: Random File I/O Regressions In 2.6
<http://kerneltrap.org/node/3039>

Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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