From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Thu, 24 Dec 2009 12:57:01 +0000 (+0000)
Subject: ARM: remove unnecessary cache flush
X-Git-Tag: v2.6.35-rc1~503^2~4^5~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f76348a360fe92063e07a8f54b0c1ea67f91e76c;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

ARM: remove unnecessary cache flush

This cache flush occurs when we first insert a page into the page
tables, where a page did not exist previously.  There can be no
cache lines associated with this virtual mapping, so this cache
flush is redundant.

Tested-by: Mike Rapoport <mike@compulab.co.il>
Tested-by: Mikael Pettersson <mikpe at it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index c9b97e9..82df01a 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -133,8 +133,6 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma,
 	flush_dcache_mmap_unlock(mapping);
 	if (aliases)
 		do_adjust_pte(vma, addr, pfn, ptep);
-	else
-		flush_cache_page(vma, addr, pfn);
 }
 
 /*