linux-kernel - Re: 2.6.25-rc4 rcupreempt.h WARNINGs while suspend/resume

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Date:	Fri, 7 Mar 2008 11:07:48 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	"Jike Song" <albcamus@...il.com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.25-rc4 rcupreempt.h WARNINGs while suspend/resume

On Fri, Mar 7, 2008 at 12:27 AM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
>
> On Thu, Mar 06, 2008 at 07:08:55PM +0800, Dave Young wrote:
>  > On Thu, Mar 6, 2008 at 11:20 AM, Dave Young <hidave.darkstar@...il.com> wrote:
>  > > On Thu, Mar 6, 2008 at 10:28 AM, Paul E. McKenney
>  > >
>  > > <paulmck@...ux.vnet.ibm.com> wrote:
>  > >  >
>  > >  > On Thu, Mar 06, 2008 at 10:11:26AM +0800, Jike Song wrote:
>  > >  >  > On Thu, Mar 6, 2008 at 12:55 AM, Paul E. McKenney
>  > >  >  > <paulmck@...ux.vnet.ibm.com> wrote:
>  > >  >  > >  Could you please try applying Karsten Wiese's patch to see if it
>  > >  >  > >  fixes the WARNINGs?  See http://lkml.org/lkml/2008/2/26/386 for
>  > >  >  > >  the patch.
>  > >  >  > >
>  > >  >  > >                                                 Thanx, Paul
>  > >  >  >
>  > >  >  > Yes, the WARNING disappears with Karsten's patch applied.
>  > >  >  > Thanks.
>  > >
>  > >  Confirmed
>  > >
>  > >
>  > >
>  > >  >
>  > >  >  Good to hear!!!  I believe that Karsten's patch is on its way in,
>  > >  >  so hopefully that will clear things up.
>  >
>  > Hi, paul
>  >
>  > My syslog became a 2G size big file yestoday due to the warnings.
>  > How about change the WARN_ON to WARN_ON_ONCE?
>
>  Hello, Dave,
>
>  I might be convinced to make this change for 2.6.26, but the condition
>  that the WARN_ON() is complaining about is quite serious, so I don't
>  want to take a chance on it getting lost in the noise in the 2.6.25
>  series.
>
>  Seem reasonable?

IMHO, WARN_ON_ONCE is enough for my eyes :)

>
>  Better yet, is there some sort of time-limited WARN_ON that kicks out
>  a message at most once per second or some such?  Enough to definitely
>  be noticed, but not enough to bring the machine to its knees?

Seems there's no such functions/macros, but is is really needed?

>
>                                                         Thanx, Paul
>
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