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    SubjectRe: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX protection for kernel data)
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    On Sat, 2010-11-27 at 01:31 +0800, mat wrote:
    > 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.

    echo 0 > /sys/devices/system/cpu/cpu1/online;
    echo 1 > /sys/devices/system/cpu/cpu1/online;

    then machine just reboots...

    >
    > Thanks,
    >
    > Matthieu


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