Messages in this thread | | | Date | Fri, 22 Aug 2008 23:44:18 -0700 | From | "H. Peter Anvin" <> | Subject | Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0() |
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Jeremy Fitzhardinge wrote: > H. Peter Anvin wrote: >> Well, smp_call_function_single already does all necessary locking; it >> makes more sense for it to check that what it's about to call still >> exists while inside the lock, instead of requiring the higher layers >> to guarantee that cannot happen on it. This is simply a matter of the >> cost of checking at this point being quite low. > > It does, already doesn't it? Hm, smp_call_function_mask() ands the > provided mask with the online mask, but it doesn't look like > smp_call_function_single() does the equivalent.
It doesn't, and that's how this bug was introduced. It's a trivial add (see test patch already posted) and should hardly matter in terms of execution time.
I'll write up a clean patch with all the error propagation tomorrow or Sunday.
-hpa
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