From: Andrew Morton <akpm@osdl.org>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: kaos@sgi.com, linux-kernel@vger.kernel.org
Subject: Re: [patch 2.6.7] bug_smp_call_function
Date: Sat, 19 Jun 2004 03:08:34 -0700 [thread overview]
Message-ID: <20040619030834.3582d2bd.akpm@osdl.org> (raw)
In-Reply-To: <20040619095910.GQ1863@holomorphy.com>
William Lee Irwin III <wli@holomorphy.com> wrote:
>
> Keith Owens <kaos@sgi.com> wrote:
> >> sg.c has been fixed to no longer call vfree() with interrupts disabled.
> >> Change smp_call_function() from WARN_ON to BUG_ON when interrupts are
> >> disabled. It was only set to WARN_ON because of sg.c.
>
> On Sat, Jun 19, 2004 at 02:44:16AM -0700, Andrew Morton wrote:
> > I prefer the WARN_ON. It is exceedingly unlikely that the bug will cause
> > lockups or memory/data corruption or anything else, so why nuke the user's
> > box when we can trivially continue?
> > We'll be sent the bug report either way.
>
> Calls to smp_call_function() with interrupts off or spinlocks held
> typically causes deadlocks on SMP systems.
No, this doesn't "typically" deadlock. It will deadlock on every ten
millionth call. The preceding 9,999,999 warnings should have imparted
sufficient clue?
next prev parent reply other threads:[~2004-06-19 10:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-19 9:36 [patch 2.6.7] bug_smp_call_function Keith Owens
2004-06-19 9:44 ` Andrew Morton
2004-06-19 9:54 ` Keith Owens
2004-06-19 9:59 ` William Lee Irwin III
2004-06-19 10:05 ` Keith Owens
2004-06-19 10:08 ` Andrew Morton [this message]
2004-06-19 10:14 ` William Lee Irwin III
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