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SubjectRe: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX protection for kernel data)
Le Tue, 23 Nov 2010 23:55:27 +0100,
mat <castet.matthieu@free.fr> a écrit :

> Le Mon, 22 Nov 2010 17:42:47 +0100,
> Andi Kleen <andi@firstfloor.org> a écrit :
>
> > > That seems to be a S3 specific code path, that won't fix anything.
> > > Simply do:
> > >
> > > echo 0 > /sys/devices/system/cpu/cpu1/online;
> > > echo 1 > /sys/devices/system/cpu/cpu1/online;
> > >
> > > and your machine will explode..
> >
> > The SMP startup trampoline is copied I believe
> > and only executed in real mode without page tables.
> >
> > So it's perhaps not the trampoline, but the early startup
> > code that ends up being broken.
> yes :
> acpi wakeup code and smp trampoline are copied in low memory (first
> 1MB).
>
> So they can't end up int the kernel data mapping ?
>
> So it should something else.
>
> I will try to investigate on this.
>
Unfortunately on my laptop supporting NX, suspend to ram seems broken
(even without this patch) and I got only one core, so I am unable to
test it.

Does cpu suspend/resume is broken ? Or it is only S3 ?

If yes, are there any interesting trace if we suspend only one core with
sysfs.

Thanks,

Matthieu
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