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SubjectRe: [PATCH] LoongArch: Fixup cmpxchg sematic for memory barrier
On Tue, Aug 1, 2023 at 6:50 PM Guo Ren <guoren@kernel.org> wrote:
>
> On Tue, Aug 1, 2023 at 5:32 PM WANG Rui <wangrui@loongson.cn> wrote:
> > No. LL and LL won't reorder because LL implies a memory barrier(though
> > not acquire semantics).
> That means we could remove __WEAK_LLSC_MB totally, right?

More precisely, __WEAK_LLSC_MB is intended to prevent reordering
between LL and normal LD used to fetch the expected value for cmpxchg.

Regards,
--
WANG Rui

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