linux-kernel - Re: [PATCH] printk: inject caller information into the body of message

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Message-ID: <20181001140606.6fa35061@gandalf.local.home>
Date:   Mon, 1 Oct 2018 14:06:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        kbuild test robot <fengguang.wu@...el.com>,
        syzkaller <syzkaller@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] printk: inject caller information into the body of
 message

On Sat, 29 Sep 2018 20:13:17 +0900
Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> On (09/28/18 20:21), Tetsuo Handa wrote:
> > On 2018/09/28 17:56, Sergey Senozhatsky wrote:  
> > > The good thing about cont buffer is that we flush it on panic. E.g.
> > > core/arch early boot stage can do:
> > > 
> > > 	pr_cont("going to call early_init_foo()...");
> > > 	early_init_foo();
> > > 	pr_cont("OK\n");
> > >   
> > 
> > Is printing
> > 
> >   going to call early_init_foo()...OK
> > 
> > in one line so critically important?  
> 

Yes. My testing infrastructure tests for this on boot up for the ftrace
self tests.

-- Steve