linux-kernel - Re: Re: [PATCH 0/2] [BUGFIX] printk: Fix message continuation breakage involved with structured printk

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Date:	Tue, 24 Dec 2013 11:50:32 +0900
From:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
To:	Kay Sievers <kay@...y.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Eiichi Tsukata <eiichi.tsukata.xh@...achi.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tejun Heo <tj@...nel.org>, yrl.pp-manager.tt@...achi.com,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Subject: Re: Re: [PATCH 0/2] [BUGFIX] printk: Fix message continuation
 breakage involved with structured printk

Hi Kay,

Thank you for replying me.

(2013/12/20 20:29), Kay Sievers wrote:
> On Fri, Dec 20, 2013 at 10:41 AM, Yoshihiro YUNOMAE
> <yoshihiro.yunomae.ez@...achi.com> wrote:
>
>> This patch set fixes message continuation breakage involved with structured
>> printk. A SCSI driver may output two continuation error messages like
>>      scmd_printk("foo");
>>      printf("bar\n");
>
> Which is the absolutely wrong thing to do. Structured logging and racy
> printk continuation must never be mixed. Userspace needs to be sure
> that dictionary entries are not subject to racy continuation hackery,
> and that these mwssages atomic, whole and intact.

I see.
As you say, user tools need to support messages output in multiple lines
for SMP environments even if this patch set is introduced.

> Please do not mix the both and do not apply these patches.

OK, I'll make important messages with KERN_CONT or no-prefix printk()
output those in single line.

Thanks,
Yoshihiro YUNOMAE

-- 
Yoshihiro YUNOMAE
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: yoshihiro.yunomae.ez@...achi.com


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