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powerpc: Fix oops due to bad access of lppaca on bare metal

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Commit 8e0b634b13 ("powerpc/64s: Do not allocate lppaca if we are
not virtualized") removed allocation of lppaca on bare metal
platforms. But with CONFIG_PPC_SPLPAR enabled, we still access the
lppaca on bare metal in some code paths.

Fix this but adding runtime checks for SPLPAR (shared processor LPAR).

Fixes: 8e0b634b13 ("powerpc/64s: Do not allocate lppaca if we are not virtualized")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2018-04-02 13:03:37 +05:30
committed by Michael Ellerman
parent 19e68b2aec
commit a6201da34f
3 changed files with 8 additions and 0 deletions
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2
arch/powerpc/include/asm/spinlock.h
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@@ -56,6 +56,8 @@
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
{
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return false;
return !!(be32_to_cpu(lppaca_of(cpu).yield_count) & 1);
}
#endif