linux-kernel - [PATCHv2] remove unnecessary cache flush on v6 copypage

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Message-ID: <20110707143019.GA16819@heechul-desktop>
Date:	Thu, 7 Jul 2011 09:30:19 -0500
From:	Heechul Yun <heechul@...inois.edu>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	saeed.bishara@...il.com
Subject: [PATCHv2] remove unnecessary cache flush on v6 copypage


ARM: mm: remove unnecessary cache flush on v6 copypage

Originally introduced to maintain coherency between icache and dcache
in v6 nonaliasing mode. This is now handled by __sync_icache_dcache since
c0177800, therefore unneceary in this function.  

Signed-off-by: Heechul Yun <heechul@...inois.edu>
Acked-by: Catalin Marinas <catalin.marinas@....com>
--
arch/arm/mm/copypage-v6.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index bdba6c6..63cca00 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -41,7 +41,6 @@ static void v6_copy_user_highpage_nonaliasing(struct page *to,
 	kfrom = kmap_atomic(from, KM_USER0);
 	kto = kmap_atomic(to, KM_USER1);
 	copy_page(kto, kfrom);
-	__cpuc_flush_dcache_area(kto, PAGE_SIZE);
 	kunmap_atomic(kto, KM_USER1);
 	kunmap_atomic(kfrom, KM_USER0);
 }
--
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