linux-kernel - Re: [PATCHv7 5/8] printk: report lost messages in printk safe/nmi contexts

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Message-ID: <20170202221155.04b45266@grimm.local.home>
Date:   Thu, 2 Feb 2017 22:13:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 5/8] printk: report lost messages in printk safe/nmi
 contexts

On Fri, 3 Feb 2017 10:57:57 +0900
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> wrote:
ell. sure, no objections, but in this particular case it's hardly
possible
> to hit all of those problems within a reasonable time. so what I did was just
> a bunch of dirty hacks to provoke the problems. something like this
> 
> 	extern int XXX;
> 
> 	vprintk_emit()
> 	{
> 		spin_lock(&logbuf_lock);
> 
> 			//
> 			// in various places
> 			//
> 			if (XXX == 1) {
> 				WARN_ON(1);
> 			}
> 
> 		spin_unlock(&logbuf_lock);
> 	}
> 
> and I set/clear that XXX from one of sysfs attrs... yeah, I know...
> but it does what I want. so I'm not really sure I want to note this
> in the change log. am I wrong?

No you are not. But just seeing this in email does help. And yeah, this
is the type of testing that I do as well on things like this. No need
to put it in the change log.

-- Steve