linux-kernel - Re: [PATCH 07/10] MCE: replace mce.c use of TIF_MCE_NOTIFY with user_return

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Message-ID: <4DF478F5.6090507@redhat.com>
Date:	Sun, 12 Jun 2011 11:29:41 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Borislav Petkov <bp@...64.org>,
	linux-kernel@...r.kernel.org, "Huang, Ying" <ying.huang@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: [PATCH 07/10] MCE: replace mce.c use of TIF_MCE_NOTIFY with user_return_notifier

On 06/10/2011 12:35 AM, Luck, Tony wrote:
> From: Tony Luck<tony.luck@...el.com>
>
> Ingo wrote:
> >  We already have a generic facility to do such things at
> >  return-to-userspace: _TIF_USER_RETURN_NOTIFY.
>
> This just a proof of concept patch ... before this can become
> real the user-return-notifier code would have to be made NMI
> safe (currently it uses hlist_add_head/hlist_del, which would
> need to be changed to Ying's NMI-safe single threaded lists).

You could use irq_work_queue() to push this into an irq context, which 
is user-return-notifier safe.

-- 
error compiling committee.c: too many arguments to function

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