linux-kernel - Re: [PATCH] fix a warning on kernel/trace/trace

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Date:	Wed, 07 Oct 2009 15:00:45 +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] fix a warning on kernel/trace/trace_branch.c

Zhenwen Xu wrote:
> fix this warning:
> 
> kernel/trace/trace_branch.c: In function ‘probe_likely_condition’:
> kernel/trace/trace_branch.c:58: warning: passing argument 1 of ‘
> trace_buffer_lock_reserve’ from incompatible pointer type
> 
> The "tr" should be "(struct buffer *)tr" or "tr->buffer" here!!!
> 

It's caused by the API change of trace_buffer_lock_reserve() by
commit e77405ad80f53966524b5c31244e13fbbbecbd84.

Could you send an updated patch to also fix the same bug
in kernel/trace/trace_hw_branch.c ?

> Signed-off-by: Zhenwen Xu <helight.xu@...il.com>
> ---
>  kernel/trace/trace_branch.c |    2 +-
>  1 files changed, 1 insertions(+), 1 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;

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