From e69244d29558c947703851a26bfed833945c093a Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@arm.com>
Date: Tue, 26 Jun 2018 15:52:38 +0100
Subject: [PATCH] ARM: 8777/1: Hook up SYNC_CORE functionality for
sys_membarrier()
Exception return implies context synchronization, so we can hook up the
SYNC_CORE option to sys_membarrier() simply by selecting the Kconfig option,
just like we've done for arm64 already.
Cc: Orion Hodson <oth@google.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
.../features/sched/membarrier-sync-core/arch-support.txt | 8 ++++----
arch/arm/Kconfig | 1 +
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/Documentation/features/sched/membarrier-sync-core/arch-support.txt b/Documentation/features/sched/membarrier-sync-core/arch-support.txt
index dbdf629077037a..c7858dd1ea8f56 100644
--- a/Documentation/features/sched/membarrier-sync-core/arch-support.txt
+++ b/Documentation/features/sched/membarrier-sync-core/arch-support.txt
@@ -5,10 +5,10 @@
#
# Architecture requirements
#
-# * arm64
+# * arm/arm64
#
-# Rely on eret context synchronization when returning from IPI handler, and
-# when returning to user-space.
+# Rely on implicit context synchronization as a result of exception return
+# when returning from IPI handler, and when returning to user-space.
#
# * x86
#
@@ -31,7 +31,7 @@
-----------------------
| alpha: | TODO |
| arc: | TODO |
- | arm: | TODO |
+ | arm: | ok |
| arm64: | ok |
| c6x: | TODO |
| h8300: | TODO |
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 54eeb8d00bc62a..b0ac1854737029 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -9,6 +9,7 @@ config ARM
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_KCOV
+ select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_SET_MEMORY
--
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