linux-kernel - Re: [GIT PULL] x86/misc for 6.5

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Date:   Tue, 27 Jun 2023 14:58:09 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Noah Goldstein <goldstein.w.n@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] x86/misc for 6.5

On Tue, 27 Jun 2023 at 14:44, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> But now I'm committed, and decided to fix that too, and just
> re-organize the code to get all the cases right.
>
> And now I'm going to actually boot-test the end result too.  Because
> life is too short to spend all my time _just_ with merging.

Well, it boots. And I clearly have networking. But who knows how much
that is actually using the csum_partial() function? Not me. I'm just
along for the ride.

Anyway, that last version handles the 40-byte special case
differently, in that it might have done some arbitrary number of
80-byte chunks first. But it shouldn't really make a difference - it
does check for >= 80- bytes first, but we're talking two extra
instructions.

And that way the end case is always less than 64 bytes, and so the
tests for 32/16/8 work fine.

And now it's committed to my test tree, so I'm not throwing it away,
but I also won't be working on it any more. If somebody wants to time
it using Arjan's little thing, more power to them.

               Linus