[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAHk-=whE3+pLUQrzK=f0_GKdYZrv=72ox2nQrPhc+jZCMLqVSw@mail.gmail.com>
Date: Mon, 24 Oct 2022 13:36:23 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Jann Horn <jannh@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
John Hubbard <jhubbard@...dia.com>, x86@...nel.org,
willy@...radead.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 01/13] mm: Update ptep_get_lockless()s comment
On Mon, Oct 24, 2022 at 1:24 PM Jann Horn <jannh@...gle.com> wrote:
>
> That's why GUP-fast re-checks the PTE after it has grabbed a reference
> to the page.
Bah. I should have known that. We got that through the PPC version
that never had the whole IPI serialization thing (just the RCU
freeing).
I haven't looked at that code in much too long.
Actually, by "much too long" I really mean "thankfully I haven't needed to" ;)
Linus
Powered by blists - more mailing lists