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Date:   Wed, 6 Jan 2021 20:16:45 -0500
From:   Steven Rostedt <>
To:     Linus Torvalds <>
Cc:     Willem de Bruijn <>,
        Jakub Kicinski <>,
        David Miller <>,
        Jonathan Lemon <>,
        Thomas Gleixner <>,
        LKML <>,
        "the arch/x86 maintainers" <>,
        Christoph Hellwig <>,
        Matthew Wilcox <>,
        Daniel Vetter <>,
        Andrew Morton <>,
        Linux-MM <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Juri Lelli <>,
        Vincent Guittot <>,
        Dietmar Eggemann <>,
        Ben Segall <>, Mel Gorman <>,
        Daniel Bristot de Oliveira <>,
        Netdev <>
Subject: Re: [BUG] from x86: Support kmap_local() forced debugging

On Wed, 6 Jan 2021 17:03:48 -0800
Linus Torvalds <> wrote:

> (although I wonder how/why the heck you've enabled
> CC_OPTIMIZE_FOR_SIZE=y, which is what causes "memcpy()" to be done as
> that "rep movsb". I thought we disabled it because it's so bad on most
> cpus).


Because to test x86_32, I have a Fedora Core 13 (yes 13!) partition
(baremetal) that I use. And the .config I use for it hasn't changed
since that time ;-) (except to add new features that I want to test on

Anyway, I'll test out your patch. Thanks for investigating this.

-- Steve

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