[PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE

On arm32, the only way to safely flush icache from usermode is to call
cacheflush(2).  This also handles any required pipeline flushes, so
membarrier's SYNC_CORE feature is useless on arm.  Remove it.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 arch/arm/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 24804f11302d..89a885fba724 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -10,7 +10,6 @@ config ARM
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_KEEPINITRD
 	select ARCH_HAS_KCOV
-	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
 	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_PHYS_TO_DMA

-- 
2.31.1