Re: [BUG] 2.6.15-rc1, soft lockup detected while probing IDE devices on AMD7441

From: Jesper Juhl (jesper.juhl_at_gmail.com)
Date: 11/30/05

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    Date:	Wed, 30 Nov 2005 13:00:03 +0100
To: "Alexander V. Inyukhin" <shurick@sectorb.msk.ru>

    On 11/30/05, Alexander V. Inyukhin <shurick@sectorb.msk.ru> wrote:
    > On Wed, Nov 23, 2005 at 08:17:51PM +0100, Jesper Juhl wrote:
    > > On Monday 21 November 2005 21:38, Alan Cox wrote:
    > > > On Sul, 2005-11-20 at 17:29 -0800, Andrew Morton wrote:
    > > > > Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
    > > > > > Quite normal. The old IDE probe code takes a long time and it makes the
    > > > > > soft lockup code believe a lockup occurred - rememeber its a debugging
    > > > > > tool not a 100% reliable detector of failures.
    > > > >
    > > > > We could put a touch_softlockup_watchdog() in there.
    > > >
    > > > Would make sense. Spin up and probe can take over 30 seconds worst case
    > > > and is polled in the IDE world. The loop will eventually exit and a true
    > > > lockup caused by a stuck IORDY line will hang forever in an inb/outb so
    > > > neither softlockup or even nmi lockup would save you.
    > >
    > > How about something like the patch below?
    > >
    > > The if (!(timeout % 128)) bit is a guess that since
    > > touch_softlockup_watchdog() is a per_cpu thing it will be cheaper to do the
    > > modulo calculation than calling the function every time through the loop,
    > > especially as the nr of CPU's go up. But it's purely a guess, so I may very
    > > well be wrong - also, 128 is an arbitrarily chosen value, it's just a nice
    > > number that'll give us <10 function calls pr second.
    >
    > It seems to work.
    > I have no BUG messages during boot with this patch.
    >
    Great.
    Thank you for testing. 

    --
Jesper Juhl <jesper.juhl@gmail.com>
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