locktorture: Replace strncmp() with str_has_prefix()

The strncmp() function is error-prone because it is easy to get the
length wrong, especially if the string is subject to change, especially
given the need to account for the terminating nul byte.  This commit
therefore substitutes the newly introduced str_has_prefix(), which
does not require a separately specified length.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index c513031cd7e3300fcc89a4340f673dd80cb59443..8dd900247205b750c94971ed7485aeaf70ed44f5 100644 (file)
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -889,16 +889,16 @@ static int __init lock_torture_init(void)
                cxt.nrealwriters_stress = 2 * num_online_cpus();
 
 #ifdef CONFIG_DEBUG_MUTEXES
-       if (strncmp(torture_type, "mutex", 5) == 0)
+       if (str_has_prefix(torture_type, "mutex"))
                cxt.debug_lock = true;
 #endif
 #ifdef CONFIG_DEBUG_RT_MUTEXES
-       if (strncmp(torture_type, "rtmutex", 7) == 0)
+       if (str_has_prefix(torture_type, "rtmutex"))
                cxt.debug_lock = true;
 #endif
 #ifdef CONFIG_DEBUG_SPINLOCK
-       if ((strncmp(torture_type, "spin", 4) == 0) ||
-           (strncmp(torture_type, "rw_lock", 7) == 0))
+       if ((str_has_prefix(torture_type, "spin")) ||
+           (str_has_prefix(torture_type, "rw_lock")))
                cxt.debug_lock = true;
 #endif