linux-kernel - [TRIVIAL PATCH] mm: Make filemap_nopage use NOPAGE

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Message-Id: <1159470592.12797.23334.camel@localhost.localdomain>
Date:	Thu, 28 Sep 2006 19:09:52 +0000
From:	Adam Litke <agl@...ibm.com>
To:	akpm@...l.org
Cc:	"ADAM G. LITKE [imap]" <agl@...ibm.com>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, hugh@...itas.com
Subject: [TRIVIAL PATCH] mm: Make filemap_nopage use NOPAGE_SIGBUS

Hi Andrew.  This is just a "nice to have" cleanup patch.  Any chance on
getting it merged (lest I forget about it again)?  Thanks.

While reading trough filemap_nopage() I found the 'return NULL'
statements a bit confusing since we already have two constants defined
for ->nopage error conditions.  Since a NULL return value really means
NOPAGE_SIGBUS, just return that to make the code more readable.

Signed-off-by: Adam Litke <agl@...ibm.com> 

 filemap.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff -upN reference/mm/filemap.c current/mm/filemap.c
--- reference/mm/filemap.c
+++ current/mm/filemap.c
@@ -1454,7 +1454,7 @@ outside_data_content:
 	 * accessible..
 	 */
 	if (area->vm_mm == current->mm)
-		return NULL;
+		return NOPAGE_SIGBUS;
 	/* Fall through to the non-read-ahead case */
 no_cached_page:
 	/*
@@ -1479,7 +1479,7 @@ no_cached_page:
 	 */
 	if (error == -ENOMEM)
 		return NOPAGE_OOM;
-	return NULL;
+	return NOPAGE_SIGBUS;
 
 page_not_uptodate:
 	if (!did_readaround) {
@@ -1548,7 +1548,7 @@ page_not_uptodate:
 	 */
 	shrink_readahead_size_eio(file, ra);
 	page_cache_release(page);
-	return NULL;
+	return NOPAGE_SIGBUS;
 }
 EXPORT_SYMBOL(filemap_nopage);
 
-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

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