linux-kernel - Re: Dealing with the NMI mess

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Date:	Fri, 24 Jul 2015 17:07:12 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>,
	Andy Lutomirski <luto@...capital.net>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: Dealing with the NMI mess

On Fri, 24 Jul 2015 22:51:19 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

 
> > Do we really take locks in the #DB handler?
> 
> do_debug()
>   send_sigtrap()
>     force_sig_info()
>       spin_lock_irqsave()
> 
> Now, I don't pretend to understand the condition before send_sigtrap(),
> so it _might_ be ok, but it sure as heck could do with a comment.

Or that force_sig_info() in send_sigtrap() looks like it can easily be
change to use an irq work queue.

-- Steve
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