On Fri, Oct 25, 2024 at 11:29:38AM +1100, Michael Ellerman wrote:
> [To += Mathieu]
>
> "Nysal Jan K.A." writes:
> > From: "Nysal Jan K.A"
> >
> > On architectures where ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
> > is not selected, sync_core_before_usermode() is a no-op.
> > In membarrier_mm_sync_core
On 2024-10-24 20:29, Michael Ellerman wrote:
[To += Mathieu]
"Nysal Jan K.A." writes:
From: "Nysal Jan K.A"
On architectures where ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
is not selected, sync_core_before_usermode() is a no-op.
In membarrier_mm_sync_core_before_usermode() the compiler does not
el
Hi!
On Fri, Oct 25, 2024 at 11:29:38AM +1100, Michael Ellerman wrote:
> [To += Mathieu]
>
> "Nysal Jan K.A." writes:
> > From: "Nysal Jan K.A"
> >
> > On architectures where ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
> > is not selected, sync_core_before_usermode() is a no-op.
> > In membarrier_mm_sync
Hi Michael,
On Fri, 25 Oct 2024 11:29:38 +1100 Michael Ellerman wrote:
>
> > diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
> > index 07bb8d4181d7..042e60ab853a 100644
> > --- a/include/linux/sched/mm.h
> > +++ b/include/linux/sched/mm.h
> > @@ -540,6 +540,8 @@ enum {
> >
> >
[To += Mathieu]
"Nysal Jan K.A." writes:
> From: "Nysal Jan K.A"
>
> On architectures where ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
> is not selected, sync_core_before_usermode() is a no-op.
> In membarrier_mm_sync_core_before_usermode() the compiler does not
> eliminate redundant branches and the lo
From: "Nysal Jan K.A"
On architectures where ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
is not selected, sync_core_before_usermode() is a no-op.
In membarrier_mm_sync_core_before_usermode() the compiler does not
eliminate redundant branches and the load of mm->membarrier_state
for this case as the atomic
