[PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier()
From: Will Deacon <hidden>
Date: 2018-06-26 09:42:10
Subsystem:
arm port, documentation, the rest · Maintainers:
Russell King, Jonathan Corbet, Linus Torvalds
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: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Orion Hodson <redacted> Signed-off-by: Will Deacon <redacted> --- v1 -> v2: Update arch-support.txt .../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 dbdf62907703..c7858dd1ea8f 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 54eeb8d00bc6..b0ac18547370 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
--
2.1.4