linux-kernel - [PATCH v2 10/10] watchdog: Replace strncmp with str_has

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Message-Id: <20190802014749.9168-1-hslester96@gmail.com>
Date:   Fri,  2 Aug 2019 09:47:49 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v2 10/10] watchdog: Replace strncmp with str_has_prefix

strncmp(str, const, len) is error-prone because len
is easy to have typo.
The example is the hard-coded len has counting error
or sizeof(const) forgets - 1.
So we prefer using newly introduced str_has_prefix
to substitute such strncmp.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
Changes in v2:
  - Revise the description.

 kernel/watchdog.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 7f9e7b9306fe..ac7a4b5f856e 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -70,13 +70,13 @@ void __init hardlockup_detector_disable(void)
 
 static int __init hardlockup_panic_setup(char *str)
 {
-	if (!strncmp(str, "panic", 5))
+	if (str_has_prefix(str, "panic"))
 		hardlockup_panic = 1;
-	else if (!strncmp(str, "nopanic", 7))
+	else if (str_has_prefix(str, "nopanic"))
 		hardlockup_panic = 0;
-	else if (!strncmp(str, "0", 1))
+	else if (str_has_prefix(str, "0"))
 		nmi_watchdog_user_enabled = 0;
-	else if (!strncmp(str, "1", 1))
+	else if (str_has_prefix(str, "1"))
 		nmi_watchdog_user_enabled = 1;
 	return 1;
 }
-- 
2.20.1