Re: [PATCH]broadcast IPI race condition on CPU hotplug

From: Andi Kleen
Date: Tue Apr 26 2005 - 08:24:30 EST

On Tue, Apr 26, 2005 at 10:20:44AM +0800, Li Shaohua wrote:
> Hi,
> After a CPU is booted but before it's officially up (set online map, and
> enable interrupt), the CPU possibly will receive a broadcast IPI. After
> it's up, it will handle the stale interrupt soon and maybe cause oops if
> it's a smp-call-function-interrupt. This is quite possible in CPU
> hotplug case, but nearly can't occur at boot time. Below patch replaces
> broadcast IPI with send_ipi_mask just like the cluster mode.

No way we are making this common operation much slower just
to fix an obscure race at boot time. PLease come up with a fix
that only impacts the boot process.


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