linux-kernel - RE: [PATCH v3 1/2] pstore: Avoid deadlock in panic and emergency-restart path

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Date:	Thu, 10 Jan 2013 18:23:17 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Tony Luck <tony.luck@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"cbouatmailru@...il.com" <cbouatmailru@...il.com>,
	Satoru Moriya <satoru.moriya@....com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>
Subject: RE: [PATCH v3 1/2] pstore: Avoid deadlock in panic and
 emergency-restart path

> Acked-by: Tony Luck <tony.luck@...el.com>
> 
> [Also Ack for part2 the touches efivars.c]
> 

Thanks :)

> -Tony
> 
> [Or are you asking me to apply these rather than just Ack them??]

Please apply these to your tree.

Seiji

> -----Original Message-----
> From: Tony Luck [mailto:tony.luck@...il.com]
> Sent: Thursday, January 10, 2013 1:21 PM
> To: Seiji Aguchi
> Cc: linux-kernel@...r.kernel.org; dzickus@...hat.com; ccross@...roid.com; keescook@...omium.org; cbouatmailru@...il.com;
> Satoru Moriya; dle-develop@...ts.sourceforge.net
> Subject: Re: [PATCH v3 1/2] pstore: Avoid deadlock in panic and emergency-restart path
> 
> On Thu, Dec 20, 2012 at 7:12 AM, Seiji Aguchi <seiji.aguchi@....com> wrote:
> > +       if (pstore_cannot_block_path(reason)) {
> > +               is_locked = spin_trylock_irqsave(&psinfo->buf_lock, flags);
> > +               if (!is_locked) {
> > +                       pr_err("pstore dump routine blocked in %s path, may corrupt error record\n"
> > +                                      , in_nmi() ? "NMI" : why);
> > +               }
> 
> My only quibble with this patchset is this message. The sentiment is nice, but nobody will see it. kmsg_dump has already picked the
> pieces of log_buf that will be saved to pstore - so this new message won't be included.  I suppose it will show up on a serial console -
> but if a user has a serial console, they don't need to use pstore.
> 
> But I don't think it is likely to hurt us (to get this far in a panic we already printed a bunch of stuff to the console and I can't think of a
> credible scenario where a few extra bytes would run into a problem that the earlier messages didn't).
> 
> So:
> 
> Acked-by: Tony Luck <tony.luck@...el.com>
> 
> [Also Ack for part2 the touches efivars.c]
> 
> -Tony
> 
> [Or are you asking me to apply these rather than just Ack them??]
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