linux-kernel - Re: [PATCH] x86: only use ERMS for user copies for larger sizes

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Message-ID: <CAHk-=wgox1vM7EiA_Ga7sY0A-piyNQPtmB=HZasOwYXySkaYXQ@mail.gmail.com>
Date:   Thu, 22 Nov 2018 09:35:37 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andrew Lutomirski <luto@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>, pabeni@...hat.com,
        Jens Axboe <axboe@...nel.dk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, bp@...en8.de,
        Peter Anvin <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>, dvlasenk@...hat.com,
        brgerst@...il.com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: only use ERMS for user copies for larger sizes

On Thu, Nov 22, 2018 at 9:26 AM Andy Lutomirski <luto@...nel.org> wrote:
>
> So I think your patch is viable.  Also, with that patch applied,
> put_user_ex() should become worse than worthless

Yes. I hate those special-case _ex variants.

I guess I should just properly forward-port my patch series where the
different steps are separated out (not jumbled up like that patch I
actually posted).

                Linus