Subject: [PATCH v2 2/2] powerpc/shared: Use static key to detect shared processor

From: Srikar Dronamraju <[email-masked]>
Date: Wed, 4 Dec 2019 21:48:16 +0530

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

Signed-off-by: Srikar Dronamraju <[email-masked]>
---
Changelog v1->v2:
Now that we no more refer to lppaca, remove the comment.

 arch/powerpc/include/asm/spinlock.h | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h
index 866f6ca0427a..251fe6e47471 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -111,13 +111,8 @@ 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));
+#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_PPC_SPLPAR)
+	return static_branch_unlikely(&shared_processor);
 #else
 	return false;
 #endif
-- 
2.18.1