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    SubjectRe: [5/6] 2.6.21-rc2: known regressions

    * Daniel Walker <dwalker@mvista.com> wrote:

    > > > FYI, this is not a "wont boot" problem, this should be a "NMI
    > > > watchdog does not work" problem - which has far lower severity.
    > > > Also, Thomas did a fix for this which is now in -mm.
    > >
    > > yup, you should be able to cross this one off, Adrian. The fix
    > > worked for me, at least.
    >
    > I didn't see a fix for this one go by .. I'll check the usual places I
    > guess ..

    find it below.

    Ingo

    ------------------------------------------------------
    Subject: fix "NMI appears to be stuck"
    From: Thomas Gleixner <tglx@linutronix.de>

    Testing NMI watchdog ... CPU#0: NMI appears to be stuck (54->54)!
    CPU#1: NMI appears to be stuck (0->0)!

    Keep the PIT/HPET alive when nmi_watchdog = 1 is given on the command
    line.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Andi Kleen <ak@suse.de>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---

    arch/i386/kernel/apic.c | 11 +++++++++--
    1 files changed, 9 insertions(+), 2 deletions(-)

    diff -puN arch/i386/kernel/apic.c~fix-nmi-appears-to-be-stuck arch/i386/kernel/apic.c
    --- a/arch/i386/kernel/apic.c~fix-nmi-appears-to-be-stuck
    +++ a/arch/i386/kernel/apic.c
    @@ -493,8 +493,15 @@ void __init setup_boot_APIC_clock(void)
    /* No broadcast on UP ! */
    if (num_possible_cpus() == 1)
    return;
    - } else
    - lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
    + } else {
    + /*
    + * If nmi_watchdog is set to IO_APIC, we need the
    + * PIT/HPET going. So we register lapic as a dummy
    + * device.
    + */
    + if (nmi_watchdog != NMI_IO_APIC)
    + lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
    + }

    /* Setup the lapic or request the broadcast */
    setup_APIC_timer();
    -
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