From 656c21d6af5d9279dd7b51ca7a4a71008127044b Mon Sep 17 00:00:00 2001
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Date: Thu, 5 Dec 2019 14:02:18 +0530
Subject: [PATCH] powerpc/shared: Use static key to detect shared processor
References: bsc#1160010 ltc#183046
Patch-mainline: v5.5-rc3
Git-commit: 656c21d6af5d9279dd7b51ca7a4a71008127044b
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
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
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 cac95a3f30c2..1b55fc08f853 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -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
--
2.23.0