From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Tue, 12 Dec 2006 17:14:56 +0000 (+0000)
Subject: [PATCH] MIPS: Fix COW D-cache aliasing on fork
X-Git-Tag: v2.6.20-rc1~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bcd022801ee514e28c32837f0b3ce18c775f1a7b;p=pandora-kernel.git

[PATCH] MIPS: Fix COW D-cache aliasing on fork

Provide a custom copy_user_highpage() to deal with aliasing issues on
MIPS.  It uses kmap_coherent() to map an user page for kernel with same
color.  Rewrite copy_to_user_page() and copy_from_user_page() with the
new interfaces to avoid extra cache flushing.

The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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