Messages in this thread | | | Date | Tue, 4 Jun 2019 14:06:59 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH HACK RFC] cpu: Prevent late-arriving interrupts from disrupting offline |
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On Tue, Jun 04, 2019 at 01:14:35AM -0700, Paul E. McKenney wrote: > On Mon, Jun 03, 2019 at 10:38:48AM +0200, Peter Zijlstra wrote:
> > And then there's powerpc which for some obscure reason thinks it needs > > to enable preemption when dying ?! pseries_cpu_die() actually calls > > msleep() ?!?! > > Isn't pseries_cpu_die() invoked via the smp_ops->cpu_die() function > pointer, whch is invoked from __cpu_die() in arch/powerpc/kernel/smp.c? > Then, if I am reading the code correctly, __cpu_die() is invoked from > takedown_cpu(), which is invoked not from the dying CPU but rather from > a surviving CPU. Or am I misreading the code?
Argh..
arch_cpu_idle_dead() -> cpu_die() -> ppc_md.cpu_die()
which is _NOT_ smp_ops.cpu_die()
this one ends in pseries_mach_cpu_die()
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