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ftrace: fix unlocking of hash

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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 <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Steven Rostedt 2008-09-06 01:06:04 -04:00 • committed by Ingo Molnar
commit 644f991d4b
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/ftrace.c
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@ -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)