linux-kernel - Re: [PATCH V2] fix a warning on kernel/trace/trace_branch.c and trace_hw

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Date:	Wed, 07 Oct 2009 16:53:41 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Zhenwen Xu <helight.xu@...il.com>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH V2] fix a warning on kernel/trace/trace_branch.c and	trace_hw_branches.c

Zhenwen Xu wrote:
> fix warnings that caused the API change of trace_buffer_lock_reserve()
> change files: kernel/trace/trace_hw_branch.c
> 	      kernel/trace/trace_branch.c
> 

Hmm, did you really compile trace_hw_branch.c while testing
this patch?

This change is necessary too:

-	trace_buffer_unlock_commit(tr, event, 0, 0);
+	trace_buffer_unlock_commit(tr->buffer, event, 0, 0);

And use a varaible "buffer = tr->buffer" should be better.

> Signed-off-by: Zhenwen Xu <helight.xu@...il.com>
> ---
>  kernel/trace/trace_branch.c      |    2 +-
>  kernel/trace/trace_hw_branches.c |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
> index 7a7a9fd..216e2dd 100644
> --- a/kernel/trace/trace_branch.c
> +++ b/kernel/trace/trace_branch.c
> @@ -54,7 +54,7 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
>  		goto out;
>  
>  	pc = preempt_count();
> -	event = trace_buffer_lock_reserve(tr, TRACE_BRANCH,
> +	event = trace_buffer_lock_reserve(tr->buffer, TRACE_BRANCH,
>  					  sizeof(*entry), flags, pc);
>  	if (!event)
>  		goto out;
> diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
> index 23b6385..1cc17ca 100644
> --- a/kernel/trace/trace_hw_branches.c
> +++ b/kernel/trace/trace_hw_branches.c
> @@ -180,7 +180,7 @@ void trace_hw_branch(u64 from, u64 to)
>  	if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
>  		goto out;
>  
> -	event = trace_buffer_lock_reserve(tr, TRACE_HW_BRANCHES,
> +	event = trace_buffer_lock_reserve(tr->buffer, TRACE_HW_BRANCHES,
>  					  sizeof(*entry), 0, 0);
>  	if (!event)
>  		goto out;
--
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