[PATCH 2/2] powerpc/shared: Use static key to detect shared processor
From: Srikar Dronamraju <hidden>
Date: 2019-12-04 13:54:55
Subsystem:
linux for powerpc (32-bit and 64-bit), locking primitives, the rest · Maintainers:
Madhavan Srinivasan, Peter Zijlstra, Ingo Molnar, Will Deacon, Boqun Feng, Linus Torvalds
With the static key shared processor available, is_shared_processor() can return without having to query the lppaca structure. Signed-off-by: Srikar Dronamraju <redacted> --- arch/powerpc/include/asm/spinlock.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h
index 866f6ca0427a..699eb306a835 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h@@ -115,9 +115,8 @@ 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)); +#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_PPC_SPLPAR) + return static_branch_unlikely(&shared_processor); #else return false; #endif
--
2.18.1