[PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier()
From: mathieu.desnoyers@efficios.com (Mathieu Desnoyers)
Date: 2018-06-26 13:26:39
----- On Jun 26, 2018, at 5:42 AM, Will Deacon will.deacon at arm.com wrote:
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>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Thanks! Mathieu
quoted hunk ↗ jump to hunk
--- 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.txtb/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 ARMselect 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
-- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com