Commit b89bdfb8 authored Aug 15, 2013 by Michael Ellerman Committed by Benjamin Herrenschmidt Aug 27, 2013

powerpc/pseries: Add a warning in the case of cross-cpu VPA registration



The spec says it "may be problematic" if CPU x registers the VPA of
CPU y. Add a warning in case we ever do that.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent 380a0b35

arch/powerpc/platforms/pseries/lpar.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -68,6 +68,12 @@ void vpa_init(int cpu)
		struct paca_struct *pp;
		struct dtl_entry *dtl;

		/*
		* The spec says it "may be problematic" if CPU x registers the VPA of
		* CPU y. We should never do that, but wail if we ever do.
		*/
		WARN_ON(cpu != smp_processor_id());

		if (cpu_has_feature(CPU_FTR_ALTIVEC))
		lppaca_of(cpu).vmxregs_in_use = 1;