Messages in this thread | | | Date | Thu, 24 May 2012 18:32:46 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] ftrace: Remove a superfluous check |
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Yo Steve,
want to pick this one up? It still applies cleanly to current linus.
Thanks.
On Thu, Mar 29, 2012 at 07:11:40PM +0200, Borislav Petkov wrote: > On Thu, Mar 29, 2012 at 07:03:23PM +0200, John Kacur wrote: > > If you're going to do this, then you can drop the label too. > > Jahaa... thanks. > > Here's an updated patch: > > -- > From 135c25a609739bbdf1c33e62119517b47f0e1d07 Mon Sep 17 00:00:00 2001 > From: Borislav Petkov <borislav.petkov@amd.com> > Date: Thu, 29 Mar 2012 18:41:15 +0200 > Subject: [PATCH] ftrace: Remove a superfluous check > > register_ftrace_function() checks ftrace_disabled and calls > __register_ftrace_function which does it again. > > Drop the first check and add the unlikely hint to the second one. Also, > drop the label as John correctly notices. > > No functional change. > > Cc: John Kacur <jkacur@redhat.com> > Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> > --- > kernel/trace/ftrace.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c > index 867bd1dd2dd0..0df8f8088ffe 100644 > --- a/kernel/trace/ftrace.c > +++ b/kernel/trace/ftrace.c > @@ -311,7 +311,7 @@ static int remove_ftrace_list_ops(struct ftrace_ops **list, > > static int __register_ftrace_function(struct ftrace_ops *ops) > { > - if (ftrace_disabled) > + if (unlikely(ftrace_disabled)) > return -ENODEV; > > if (FTRACE_WARN_ON(ops == &global_ops)) > @@ -4304,16 +4304,12 @@ int register_ftrace_function(struct ftrace_ops *ops) > > mutex_lock(&ftrace_lock); > > - if (unlikely(ftrace_disabled)) > - goto out_unlock; > - > ret = __register_ftrace_function(ops); > if (!ret) > ret = ftrace_startup(ops, 0); > > - > - out_unlock: > mutex_unlock(&ftrace_lock); > + > return ret; > } > EXPORT_SYMBOL_GPL(register_ftrace_function); > -- > 1.7.9.3.362.g71319
-- Regards/Gruss, Boris.
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