linux-kernel - Re: [tip:tracing/urgent] tracing: Fix trace_print

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Date:	Wed, 01 Jul 2009 17:15:59 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	eduard.munteanu@...ux360.ro, xiaoguangrong@...fujitsu.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/urgent] tracing: Fix trace_print_seq()

On Wed, 2009-07-01 at 14:06 +0000, tip-bot for Xiao Guangrong wrote:
> Commit-ID:  5c37f525657e879a17a27c83021602cd55837531
> Gitweb:     http://git.kernel.org/tip/5c37f525657e879a17a27c83021602cd55837531
> Author:     Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> AuthorDate: Wed, 1 Jul 2009 16:50:25 +0800
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Wed, 1 Jul 2009 16:03:50 +0200
> 
> tracing: Fix trace_print_seq()
> 
> We will lose something if trace_seq->buffer[0] is 0, because the copy length
> is calculated by strlen() in seq_puts(), so using seq_write() instead of
> seq_puts().
> 
> There have a example:
> after reboot:
> 
>  # echo kmemtrace > current_tracer
>  # echo 0 > options/kmem_minimalistic
>  # cat trace
>  # tracer: kmemtrace
>  #
>  #
> 
> Nothing is exported, because the first byte of trace_seq->buffer[ ]
> is KMEMTRACE_USER_ALLOC.
> 
> ( the value of KMEMTRACE_USER_ALLOC is zero, seeing
>   kmemtrace_print_alloc_user() in kernel/trace/kmemtrace.c)
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Pekka Enberg <penberg@...helsinki.fi>
> LKML-Reference: <4A4B2351.5010300@...fujitsu.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>

Nice catch!

Acked-by: Pekka Enberg <penberg@...helsinki.fi>

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