linux-kernel - [PATCH 4/5] tmpfs: cleanup mpol_parse

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Message-Id: <20100316145121.4C51.A69D9226@jp.fujitsu.com>
Date:	Tue, 16 Mar 2010 14:52:18 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com, kiran@...lex86.org,
	cl@...ux-foundation.org, hugh.dickins@...cali.co.uk,
	lee.schermerhorn@...com, mel@....ul.ie, stable@...nel.org,
	linux-mm <linux-mm@...ck.org>, akpm@...ux-foundation.org
Subject: [PATCH 4/5] tmpfs: cleanup mpol_parse_str()

mpol_parse_str() made lots 'err' variable related bug. because
it is ugly and reviewing unfriendly.

This patch makes simplify it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Ravikiran Thirumalai <kiran@...lex86.org>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Lee Schermerhorn <lee.schermerhorn@...com>
Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc: <stable@...nel.org>
---
 mm/mempolicy.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 5c197d5..816419d 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2193,8 +2193,8 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 			char *rest = nodelist;
 			while (isdigit(*rest))
 				rest++;
-			if (!*rest)
-				err = 0;
+			if (*rest)
+				goto out;
 		}
 		break;
 	case MPOL_INTERLEAVE:
@@ -2203,7 +2203,6 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 		 */
 		if (!nodelist)
 			nodes = node_states[N_HIGH_MEMORY];
-		err = 0;
 		break;
 	case MPOL_LOCAL:
 		/*
@@ -2212,7 +2211,6 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 		if (nodelist)
 			goto out;
 		mode = MPOL_PREFERRED;
-		err = 0;
 		break;
 	case MPOL_DEFAULT:
 		/*
@@ -2227,7 +2225,6 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 		 */
 		if (!nodelist)
 			goto out;
-		err = 0;
 	}
 
 	mode_flags = 0;
@@ -2241,13 +2238,14 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 		else if (!strcmp(flags, "relative"))
 			mode_flags |= MPOL_F_RELATIVE_NODES;
 		else
-			err = 1;
+			goto out;
 	}
 
 	new = mpol_new(mode, mode_flags, &nodes);
 	if (IS_ERR(new))
-		err = 1;
-	else {
+		goto out;
+
+	{
 		int ret;
 		NODEMASK_SCRATCH(scratch);
 		if (scratch) {
@@ -2258,13 +2256,15 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 			ret = -ENOMEM;
 		NODEMASK_SCRATCH_FREE(scratch);
 		if (ret) {
-			err = 1;
 			mpol_put(new);
-		} else if (no_context) {
-			/* save for contextualization */
-			new->w.user_nodemask = nodes;
+			goto out;
 		}
 	}
+	err = 0;
+	if (no_context) {
+		/* save for contextualization */
+		new->w.user_nodemask = nodes;
+	}
 
 out:
 	/* Restore string for error message */
-- 
1.6.5.2



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