linux-kernel - Re: [PATCH V3] fix a warning on kernel/trace/trace_branch.c andtrace_hw

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Message-ID: <4ACD37C7.4060305@cn.fujitsu.com>
Date:	Thu, 08 Oct 2009 08:52:23 +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 V3] fix a warning on kernel/trace/trace_branch.c	andtrace_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
> 
> Signed-off-by: Zhenwen Xu <helight.xu@...il.com>
> ---
>  kernel/trace/trace_branch.c      |    2 +-
>  kernel/trace/trace_hw_branches.c |    6 ++++--
>  2 files changed, 5 insertions(+), 3 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);

As Steven has picked up the previous patch, this part can be removed now.

>  	if (!event)
>  		goto out;
> diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
> index 23b6385..e40f5fb 100644
> --- a/kernel/trace/trace_hw_branches.c
> +++ b/kernel/trace/trace_hw_branches.c
> @@ -165,6 +165,7 @@ void trace_hw_branch(u64 from, u64 to)
>  	struct ftrace_event_call *call = &event_hw_branch;
>  	struct trace_array *tr = hw_branch_trace;
>  	struct ring_buffer_event *event;
> +	struct ring_buffer      *buf;

Just use one space:

 +	struct ring_buffer *buf;

>  	struct hw_branch_entry *entry;
>  	unsigned long irq1;
>  	int cpu;
> @@ -180,7 +181,8 @@ 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,
> +	buf = tr->buffer
> +	event = trace_buffer_lock_reserve(buf, TRACE_HW_BRANCHES,
>  					  sizeof(*entry), 0, 0);
>  	if (!event)
>  		goto out;
> @@ -190,7 +192,7 @@ void trace_hw_branch(u64 from, u64 to)
>  	entry->from = from;
>  	entry->to   = to;
>  	if (!filter_check_discard(call, entry, tr->buffer, event))

s/tr->buffer/buf

> -		trace_buffer_unlock_commit(tr, event, 0, 0);
> +		trace_buffer_unlock_commit(buf, event, 0, 0);
>  
>   out:
>  	atomic_dec(&tr->data[cpu]->disabled);

Otherwise looks good.
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