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    Subject[PATCH 55/79] [PATCH] calibrate delay with irqs enabled
    From: Glauber Costa <>

    We do it to make it close to x86_64. The later needs it,
    otherwise the nmi watchdog can get into the scene and kill us
    with a hammer.

    Enabling irqs here used to trigger a bug in i386. This is because
    time irq handling relies upon structures that are only initialized
    after smp initcalls (More precisely, it will find
    per_cpu(hrtimer_bases, cpu)->cb_pending list not initialized and crash)

    Signed-off-by: Glauber Costa <>
    arch/x86/kernel/smpboot_32.c | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
    index dbfaeb3..bd2f886 100644
    --- a/arch/x86/kernel/smpboot_32.c
    +++ b/arch/x86/kernel/smpboot_32.c
    @@ -167,7 +167,9 @@ static void __cpuinit smp_callin(void)
    * Get our bogomips.
    + local_irq_enable();
    + local_irq_disable();
    Dprintk("Stack at about %p\n",&cpuid);


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      Last update: 2008-03-19 21:29    [W:0.019 / U:8.108 seconds]
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