* [PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier()
@ 2018-06-26 9:42 Will Deacon
2018-06-26 13:26 ` Mathieu Desnoyers
0 siblings, 1 reply; 3+ messages in thread
From: Will Deacon @ 2018-06-26 9:42 UTC (permalink / raw)
To: linux-arm-kernel
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 <oth@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier()
2018-06-26 9:42 [PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier() Will Deacon
@ 2018-06-26 13:26 ` Mathieu Desnoyers
2018-06-26 13:47 ` Orion Hodson
0 siblings, 1 reply; 3+ messages in thread
From: Mathieu Desnoyers @ 2018-06-26 13:26 UTC (permalink / raw)
To: linux-arm-kernel
----- 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 <oth@google.com>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thanks!
Mathieu
> ---
>
> 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
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier()
2018-06-26 13:26 ` Mathieu Desnoyers
@ 2018-06-26 13:47 ` Orion Hodson
0 siblings, 0 replies; 3+ messages in thread
From: Orion Hodson @ 2018-06-26 13:47 UTC (permalink / raw)
To: linux-arm-kernel
Great, thank you!
On Tue, Jun 26, 2018 at 2:26 PM Mathieu Desnoyers
<mathieu.desnoyers@efficios.com> wrote:
>
> ----- 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 <oth@google.com>
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
>
> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
>
> Thanks!
>
> Mathieu
>
> > ---
> >
> > 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
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
--
Orion Hodson | Software Engineer | oth at google.com | +44 7505 730469
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-06-26 9:42 [PATCH v2] arm: Hook up SYNC_CORE functionality for sys_membarrier() Will Deacon
2018-06-26 13:26 ` Mathieu Desnoyers
2018-06-26 13:47 ` Orion Hodson
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