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

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Date:	Fri, 20 Dec 2013 18:41:34 +0900
From:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
To:	linux-kernel@...r.kernel.org
Cc:	Eiichi Tsukata <eiichi.tsukata.xh@...achi.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Kay Sievers <kay@...y.org>, 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: [PATCH 0/2] [BUGFIX] printk: Fix message continuation breakage
 involved with structured printk

Hi,

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");
Here, scmd_printk() is structured printk with key/value dictionary information.
Structured printk became to forcibly start a new line from commit c313af14, so
those SCSI continuation error messages are divided as follows:
    [1234.567890] sd 2:0:0:0: [sdb] foo
    [1234.567893] bar                    <---- Divided
However, the SCSI driver may expect following continuation error messages:
    [1234.567893] sd 2:0:0:0: [sdb] foo bar
When user tools handle the error messages, that divided message will create
some inconveniences.

This patch set makes structured printk with dictionary information not start a
new line. Moreover, when multiple structured printk messages are continued,
this patch outputs those multiple dictionary information when we read /dev/kmsg.

Thanks!

---

Yoshihiro YUNOMAE (2):
      printk: Add dictionary information in structure cont
      printk: Delete LOG_NEWLINE flag for structured printk


 kernel/printk/printk.c |   70 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 25 deletions(-)

-- 
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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