On 8/13/24 15:48, Linus Torvalds wrote:
On Tue, 13 Aug 2024 at 12:01, Waiman Long <longman@xxxxxxxxxx> wrote:
Do we need a new ARCH flag?
I'm confused by that question.
That's clearly exactly what that ARCH_HAS_ACQUIRE_RELEASE is.
Obviously all architectures "have" it - in the sense that we always
have access to a "smp_load_acquire()/smp_store_release()".
Sorry for the confusion. What you said above is actually the reason that
I ask this question. In the same way, smp_rmb()/wmb() is available for
all arches. I am actually asking if it should be a flag that indicates
the arch's preference to use acquire/release over rmb/wmb.
Cheers,
Longman
But if the architecture doesn't support it natively, the old rmb/wmb
model may be preferred.
Although maybe we're at the point where we don't even care about that.
Linus
