linux-kernel - [PATCH 6/6] nommu: fix a compile warning in do_mmap

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Date:	Mon, 28 Mar 2011 22:56:47 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	David Howells <dhowells@...hat.com>,
	Greg Ungerer <gerg@...pgear.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] nommu: fix a compile warning in do_mmap_pgoff()

Because 'ret' is declared as int, not unsigned long, no need to cast the
error contants into unsigned long. If you compile this code on a 64-bit
machine somehow, you'll see following warning:

  CC      mm/nommu.o
mm/nommu.c: In function ‘do_mmap_pgoff’:
mm/nommu.c:1411: warning: overflow in implicit constant conversion

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 mm/nommu.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 662fd46449a6..c7af249076ac 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1400,15 +1400,15 @@ unsigned long do_mmap_pgoff(struct file *file,
 		if (capabilities & BDI_CAP_MAP_DIRECT) {
 			addr = file->f_op->get_unmapped_area(file, addr, len,
 							     pgoff, flags);
-			if (IS_ERR((void *) addr)) {
+			if (IS_ERR_VALUE(addr)) {
 				ret = addr;
-				if (ret != (unsigned long) -ENOSYS)
+				if (ret != -ENOSYS)
 					goto error_just_free;
 
 				/* the driver refused to tell us where to site
 				 * the mapping so we'll have to attempt to copy
 				 * it */
-				ret = (unsigned long) -ENODEV;
+				ret = -ENODEV;
 				if (!(capabilities & BDI_CAP_MAP_COPY))
 					goto error_just_free;
 
-- 
1.7.4

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