From: Steven Rostedt Date: Sat, 6 Sep 2008 05:06:04 +0000 (-0400) Subject: ftrace: fix unlocking of hash X-Git-Tag: v2.6.28-rc1~78^2~77 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=644f991d4b920ab1f5043509651479420b293490;p=linux-2.6-omap-h63xx.git ftrace: fix unlocking of hash This must be brown paper bag week for Steven Rostedt! While working on ftrace for PPC, I discovered that the hash locking done when CONFIG_FTRACE_MCOUNT_RECORD is not set, is totally incorrect. With a cut and paste error, I had the hash lock macro to lock for both hash_lock _and_ hash_unlock! This bug did not affect x86 since this bug was introduced when CONFIG_FTRACE_MCOUNT_RECORD was added to x86. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index b69966f0f14..c9e09d86e1d 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -170,7 +170,8 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops) */ static DEFINE_SPINLOCK(ftrace_hash_lock); #define ftrace_hash_lock(flags) spin_lock_irqsave(&ftrace_hash_lock, flags) -#define ftrace_hash_unlock(flags) spin_lock_irqsave(&ftrace_hash_lock, flags) +#define ftrace_hash_unlock(flags) \ + spin_unlock_irqrestore(&ftrace_hash_lock, flags) #else /* This is protected via the ftrace_lock with MCOUNT_RECORD. */ #define ftrace_hash_lock(flags) do { (void)(flags); } while (0)