From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 30 May 2013 07:19:35 +0000 (+0200)
Subject: scatterlist: sg_set_buf() argument must be in linear mapping
X-Git-Tag: upstream/snapshot3+hdmi~4937^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ac4e97abce9b80c020e7113325f49e58b7b15e3f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

scatterlist: sg_set_buf() argument must be in linear mapping

Add a check behind CONFIG_DEBUG_SG to verify this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 5951e3f..2680677 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -111,6 +111,9 @@ static inline struct page *sg_page(struct scatterlist *sg)
 static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
 			      unsigned int buflen)
 {
+#ifdef CONFIG_DEBUG_SG
+	BUG_ON(!virt_addr_valid(buf));
+#endif
 	sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
 }