From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Mon, 9 Feb 2009 03:22:14 +0000 (+1100)
Subject: crypto: scatterwalk - Avoid flush_dcache_page on slab pages
X-Git-Tag: upstream/snapshot3+hdmi~20289^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4f3e797ad07d52d34983354a77b365dfcd48c1b4;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

crypto: scatterwalk - Avoid flush_dcache_page on slab pages

It's illegal to call flush_dcache_page on slab pages on a number
of architectures.  So this patch avoids doing so if PageSlab is
true.

In future we can move the flush_dcache_page call to those page
cache users that actually need it.

Reported-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 9aeeb52..3de89a4 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -54,7 +54,8 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
 		struct page *page;
 
 		page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
-		flush_dcache_page(page);
+		if (!PageSlab(page))
+			flush_dcache_page(page);
 	}
 
 	if (more) {