linux-kernel - [PATCH] ttm: Fix a potential comparison of structs.

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Date:	Sun, 2 Aug 2009 20:36:43 +0300
From:	Pekka Paalanen <pq@....fi>
To:	dri-devel@...ts.sourceforge.net
Cc:	Thomas Hellstrom <thellstrom@...are.com>,
	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...il.com>
Subject: [PATCH] ttm: Fix a potential comparison of structs.

>From 5e2851952729b287a82efa002b28a2095404d44d Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@...are.com>
Date: Fri, 31 Jul 2009 10:47:51 +0200
Subject: [PATCH] ttm: Fix a potential comparison of structs.

On some architectures the comparison may cause a compilation failure.

Original partial fix Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>

Signed-off-by: Pekka Paalanen <pq@....fi>
---

Thomas, you forgot two more of these :-)
Here's a patch that actually compiles on x86_64.

 drivers/gpu/drm/ttm/ttm_bo_util.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index f4e2eba..999fbe7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -151,7 +151,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 #ifdef CONFIG_X86
 	dst = kmap_atomic_prot(d, KM_USER0, prot);
 #else
-	if (prot != PAGE_KERNEL)
+	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 		dst = vmap(&d, 1, 0, prot);
 	else
 		dst = kmap(d);
@@ -164,7 +164,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 #ifdef CONFIG_X86
 	kunmap_atomic(dst, KM_USER0);
 #else
-	if (prot != PAGE_KERNEL)
+	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 		vunmap(dst);
 	else
 		kunmap(d);
@@ -187,7 +187,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 #ifdef CONFIG_X86
 	src = kmap_atomic_prot(s, KM_USER0, prot);
 #else
-	if (prot != PAGE_KERNEL)
+	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 		src = vmap(&s, 1, 0, prot);
 	else
 		src = kmap(s);
@@ -200,7 +200,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 #ifdef CONFIG_X86
 	kunmap_atomic(src, KM_USER0);
 #else
-	if (prot != PAGE_KERNEL)
+	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 		vunmap(src);
 	else
 		kunmap(s);
-- 
1.6.3.3

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