linux-kernel - [PATCH 27/33] sched/debug: use match

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Date:   Mon, 21 May 2018 19:58:04 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Yisheng Xie <xieyisheng1@...wei.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 27/33] sched/debug: use match_string() helper

match_string() returns the index of an array for a matching string,
which can be used intead of open coded variant.

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
 kernel/sched/debug.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 15b10e2..9e34499 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -111,16 +111,14 @@ static int sched_feat_set(char *cmp)
 		cmp += 3;
 	}
 
-	for (i = 0; i < __SCHED_FEAT_NR; i++) {
-		if (strcmp(cmp, sched_feat_names[i]) == 0) {
-			if (neg) {
-				sysctl_sched_features &= ~(1UL << i);
-				sched_feat_disable(i);
-			} else {
-				sysctl_sched_features |= (1UL << i);
-				sched_feat_enable(i);
-			}
-			break;
+	i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
+	if (i >= 0) {
+		if (neg) {
+			sysctl_sched_features &= ~(1UL << i);
+			sched_feat_disable(i);
+		} else {
+			sysctl_sched_features |= (1UL << i);
+			sched_feat_enable(i);
 		}
 	}
 
@@ -150,7 +148,7 @@ static int sched_feat_set(char *cmp)
 	inode_lock(inode);
 	i = sched_feat_set(cmp);
 	inode_unlock(inode);
-	if (i == __SCHED_FEAT_NR)
+	if (i < 0)
 		return -EINVAL;
 
 	*ppos += cnt;
-- 
1.7.12.4