Re: [patch] smp-2.3.41-A1, (was: Re: BUG? i386 TLB Flushing)

From: Christoph Rohland (hans-christoph.rohland@sap.com)
Date: Tue Jan 25 2000 - 03:48:43 EST


Ingo Molnar <mingo@chiara.csoma.elte.hu> writes:

> On Mon, 24 Jan 2000, Stephen C. Tweedie wrote:
>
> > > yeah, this is indeed a bug and it also explains the one remaining 64GB
> > > mystery: the extra invlpg in highmem.c. Patch (with other SMP fixes) will
> > > follow shortly.
> >
> > I was really, really hoping that this might lay to rest the boot
> > failures with PAE36 for me, but no such luck --- 2.3.40 still dies with
> > SIGSEGV in init. Zach Brown can reproduce the same thing on one of his
> > boxes: Zach, does 2.3.40 do anything to help things for you?
>
> ok, how about the attached smp-2.3.41-A1 patch:
>
> - fixes dumb cr4 flushing typo found by Manfred
>
> - (tries to fix) current->active_mm == NULL problem by moving the
> setting of prev->active_mm to after the switch_to(). It happens
> before has_cpu is set to 0, so it should be safe. It also cannot
> open up a window to TLB corruption i believe.
>
> -- mingo
>

This fixed the problems introduced with 2.3.39 on my shm tests.

Thanks
                Christoph

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