linux-kernel - Re: [RFC][PATCH 3/3] x86/nmi: Perform a safe NMI stack trace on all CPUs

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Message-ID: <20141119105311.GB5617@pd.tnic>
Date:	Wed, 19 Nov 2014 11:53:11 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Petr Mladek <pmladek@...e.cz>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andy Lutomirski <luto@...capital.net>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [RFC][PATCH 3/3] x86/nmi: Perform a safe NMI stack trace on all
 CPUs

On Wed, Nov 19, 2014 at 11:44:56AM +0100, Jiri Kosina wrote:
> If we are going down this path, do_nmi() should be early enough to do
> it, no need to pollute NMI assembly code with this.

do_nmi() doesn't cover all, like do_machine_check(), do_double_fault(),
and the rest of the handlers. I'm suggesting to do it before any handler
gets run so that you can use printk in the handler itself.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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