linux-kernel - Re: [PATCH 13/13] mm: Remove pointless barrier() after pmdp_get

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Message-ID: <CAOUHufZo=fB2HcaCrj2aidLJ2zEhOpi7ou5M_7qOQiuQq8+wTQ@mail.gmail.com>
Date:   Sat, 22 Oct 2022 13:59:32 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, willy@...radead.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, aarcange@...hat.com,
        kirill.shutemov@...ux.intel.com, jroedel@...e.de, ubizjak@...il.com
Subject: Re: [PATCH 13/13] mm: Remove pointless barrier() after pmdp_get_lockless()

On Sat, Oct 22, 2022 at 5:48 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> pmdp_get_lockless() should itself imply any ordering required.

There are three remaining barriers that should be removed as well.