linux-kernel - Re: [GIT PULL] EDAC fix for 5.17

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Message-ID: <CAHk-=whvy0h0WfT8g=6rfws75xB94+yuALtSY1Gpx0bvnOqTFg@mail.gmail.com>
Date:   Sun, 20 Feb 2022 12:39:11 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...e.de>
Cc:     linux-edac <linux-edac@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] EDAC fix for 5.17

On Sun, Feb 20, 2022 at 12:25 PM Borislav Petkov <bp@...e.de> wrote:
>
> Yah, where do I start... so, about this, I think I can simplify it by
> simply unconditionally aligning to 8.

Sounds good.

Then you could just do something like

        void *ptr = (void *)ALIGN_UP((unsigned long)*p, 8);
        *p = ptr + size*n_memb;
        return ptr;

and that would be a lot simpler.

> My gut feeling is telling me
> 8-bytes alignment should simply work on everything. Because if it does,
> all that crap becomes a lot simpler. But maybe I'm being too simplistic
> here and there might be a corner-case where 8-bytes alignment just
> doesn't work...

Well, if 8-byte alignment doesn't work, then the existing code (with
the fix) doesn't work either, so..

                 Linus