Commit 656c21d6 authored Dec 05, 2019 by Srikar Dronamraju Committed by Michael Ellerman Dec 13, 2019

powerpc/shared: Use static key to detect shared processor



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

parent 14c73bd3

arch/powerpc/include/asm/spinlock.h

+2 −7

Original line number	Diff line number	Diff line
		@@ -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

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