linux-kernel - Re: [PATCH 1/3] blktrace: delete garbage for message trace

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Message-ID: <x49inym6l36.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 10 May 2016 10:31:25 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Shaohua Li <shli@...com>
Cc:	<linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>, <axboe@...com>,
	<Kernel-team@...com>
Subject: Re: [PATCH 1/3] blktrace: delete garbage for message trace

Shaohua Li <shli@...com> writes:

> commit f4a1d08ce65 introduces a regression. Originally for
> BLK_TN_MESSAGE, we add message in trace and return. The commit ignores
> the early return and add garbage info.
>
> Signed-off-by: Shaohua Li <shli@...com>
> ---
>  kernel/trace/blktrace.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index f94e7a2..8ae9ea2 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1349,6 +1349,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
>  	if (t->action == BLK_TN_MESSAGE) {
>  		log_action(iter, long_act ? "message" : "m");
>  		blk_log_msg(s, iter->ent);
> +		return trace_handle_return(s);
>  	}
>  
>  	if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))

It would have been closer to the original to put the 'out' label back
in, but this is fine.

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>