Messages in this thread | | | Subject | RE: [PATCH] Fix the race between smp_call_function and CPU booting | From | Peter Zijlstra <> | Date | Wed, 14 Mar 2012 10:43:17 +0100 |
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On Wed, 2012-03-14 at 06:27 +0000, Liu, Chuansheng wrote: > On the unplug case, after set the CPU to !active, we do not need IPI > handling for the corresponding > CPU before it is set to offline. I did not find any impact that > limiting the smp_call_function > just after CPU is active.
Have a look at Alpha, it's flush_tlb_mm() can use smp_call_function(), in the !active,online case you very much still need to tlb flush that cpu.
The fact that it works on a limited use case on x86 doesn't say anything much at all.
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