linux-kernel - Re: [PATCH v5] x86: Avoid pr_cont() in show

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Message-ID: <20180724074209.GA18523@gmail.com>
Date:   Tue, 24 Jul 2018 09:42:09 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org, joe@...ches.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v5] x86: Avoid pr_cont() in show_opcodes().


* Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> wrote:

> On 2018/07/18 20:57, Ingo Molnar wrote:
> > 
> > * Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> > 
> >> Since syzbot is confused by concurrent printk() messages [1],
> >> this patch changes show_opcodes() to use %ph format string.
> >>
> >> When we start adding prefix to each line of printk() output,
> >> we will be able to handle concurrent printk() messages.
> >>
> >> [1] https://syzkaller.appspot.com/text?tag=CrashReport&x=139d342c400000
> >>
> >> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> >> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> > 
> > Wasn't that variant of the patch written by Rasmus?
> 
> Rasmus Villemoes taught me that we can use "%*ph" format string and pass
> length as arguments for "*" part. Then, since Joe Perches suggested me to
> use #define for length variable, I updated to use "#define length immediate"
> and replaced "%*ph" with "%" __strigify(length) "ph" and removed length from
> arguments. That is v5 patch.
> 
> > 
> > If so then the changelog should start with:
> > 
> >  From: Rasmus Villemoes <linux@...musvillemoes.dk>
> 
> OK. I posted v6 patch with From: line updated.

Please do that only if it was mainly written by him - otherwise just tell me that 
it's yours and I'll apply it as such.

Thanks,

	Ingo