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| author | Michael Ellerman <michael@ellerman.id.au> | 2013-08-15 15:22:15 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-27 14:44:28 +1000 |
| commit | b89bdfb8deb0cac5141f54806e406e5888175c80 (patch) | |
| tree | cdd1cb4874fb8661e44c8479a1fc591fe1fa6e63 | |
| parent | 380a0b3535b09ea6fe580f9cb6f28ca168f14abc (diff) | |
| download | op-kernel-dev-b89bdfb8deb0cac5141f54806e406e5888175c80.zip op-kernel-dev-b89bdfb8deb0cac5141f54806e406e5888175c80.tar.gz | |
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>
| -rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 6d5e932..356bc75 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -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; |
