Re: [PATCH][2.5] flush_tlb_all is not preempt safe.

From: Zwane Mwaikambo (
Date: Fri Feb 14 2003 - 06:13:16 EST

On Fri, 14 Feb 2003, Zwane Mwaikambo wrote:

> Hi,
> Considering that smp_call_function isn't allowed to hold a lock
> reference and within smp_call_function we lock and unlock call_lock thus
> triggering a preempt point. Therefore we can't guarantee that we'll be on
> the same processor when we hit do_flush_tlb_all_local.
> void flush_tlb_all(void)
> {
> preempt_disable();
> smp_call_function (flush_tlb_all_ipi,0,1,1);
> do_flush_tlb_all_local();
> preempt_enable();
> }

Of course i had to go and paste the code i was working on. The original
isn't wrapped in preempt_disable/enable.

        Zwane (who really needs to get to bed now)

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