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SubjectRe: [patch] shaper fix for timer SMP races [was Re: 2.2.2-pre2 hangs]
On Mon, 15 Feb 1999, Andrea Arcangeli wrote:

>Here the patch against 2.2.{[01],2-pre2}. Alex could you try it out and
>see if you can reproduce the machine lockup?

The patch I sent yesterday is not enough (I thought it was bogus also
yesterday at first, then I had not time to think a lot about it and then
for some unknown reason I thought it was enough). (it would be enough if
all networking hardware would be not irq driven)

It's obviously not enough since synchronize_bh() is a nono called from an
irq handler (and shaper_kick() is going to be recalled from an irq
handler).

I developed a new patch that I sent to Alex now for testing. The new patch
also get rid of _all_ cli(). I'll forward the new patch to list if it will
work OK. Unfortuantely today it's a not-kernel day since I'll have a hard
oral math exam tomorrow and I have to study Analysis II _boring_ theory
now ;).

Andrea Arcangeli


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