linux-kernel - [patch 004/164] libata: dont flush dcache on slab pages

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Message-Id: <20100701173427.218307807@clark.site>
Date:	Thu, 01 Jul 2010 10:33:10 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [patch 004/164] libata: dont flush dcache on slab pages

2.6.33-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>

commit 3842e835490cdf17013b30a788f6311bdcfd0571 upstream.

page_mapping() check this via VM_BUG_ON(PageSlab(page)) so we bug here
with the according debuging turned on.

Future TODO: replace this with a flush_dcache_page_for_pio() API

Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/ata/libata-sff.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -893,7 +893,7 @@ static void ata_pio_sector(struct ata_qu
 				       do_write);
 	}
 
-	if (!do_write)
+	if (!do_write && !PageSlab(page))
 		flush_dcache_page(page);
 
 	qc->curbytes += qc->sect_size;


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