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powerpc/shared: Use static key to detect shared processor

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With the static key shared processor available, is_shared_processor()
can return without having to query the lppaca structure.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Phil Auld <pauld@redhat.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191213035036.6913-2-mpe@ellerman.id.au
This commit is contained in:
Srikar Dronamraju 2019-12-05 14:02:18 +05:30 committed by Michael Ellerman
parent 14c73bd344
commit 656c21d6af
1 changed files with 2 additions and 7 deletions
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9
arch/powerpc/include/asm/spinlock.h
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@ -112,13 +112,8 @@ static inline void splpar_rw_yield(arch_rwlock_t *lock) {};
static inline bool is_shared_processor(void)
{
/*
* LPPACA is only available on Pseries so guard anything LPPACA related to
* allow other platforms (which include this common header) to compile.
*/
#ifdef CONFIG_PPC_PSERIES
return (IS_ENABLED(CONFIG_PPC_SPLPAR) &&
lppaca_shared_proc(local_paca->lppaca_ptr));
#ifdef CONFIG_PPC_SPLPAR
return static_branch_unlikely(&shared_processor);
#else
return false;
#endif