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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>
This commit is contained in:
Michael Ellerman 2013-08-15 15:22:15 +10:00 committed by Benjamin Herrenschmidt
parent 380a0b3535
commit b89bdfb8de
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/platforms/pseries/lpar.c
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@ -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;