linux-kernel - Re: x86 copy performance regression

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Message-ID: <CAHk-=wig6VizZHtRznz7uAWa-hHWjrCNANZ9B+1G=aTWPiVH4g@mail.gmail.com>
Date:   Fri, 26 May 2023 09:56:53 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: x86 copy performance regression

On Fri, May 26, 2023 at 9:37 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> Hmm.. my build environment does not like this yet :)

Ahh, I tested it in an allmodconfig build, but only building that one
file, and not trying to link it. And gas was apparent;y perfectly
happy just leaving that undefined feature as a relocation.

I assume that if you just add a

   #include <asm/cpufeatures.h>

to the includes, it magically works for you?

             Linus