linux-kernel - Re: [PATCH v2 00/13] Unify asm/unaligned.h around struct helper

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Date:   Fri, 14 May 2021 12:22:42 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ganapathi Bhat <ganapathi017@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        James Morris <jmorris@...ei.org>, Jens Axboe <axboe@...nel.dk>,
        John Johansen <john.johansen@...onical.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Kalle Valo <kvalo@...eaurora.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Rich Felker <dalias@...c.org>,
        "Richard Russon (FlatCap)" <ldm@...tcap.org>,
        Russell King <linux@...linux.org.uk>,
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Subject: Re: [PATCH v2 00/13] Unify asm/unaligned.h around struct helper

On Fri, May 14, 2021 at 11:52 AM Vineet Gupta
<Vineet.Gupta1@...opsys.com> wrote:
>
> Wasn't the new zlib code slated for 5.14. I don't see it in your master yet

You're right, I never actually committed it, since it was specific to
ARC and -O3 and I wasn't entirely happy with the amount of testing it
got (with Heiko pointing out that the s390 stuff needed more fixes for
the change).

So in fact it's not even queued up for 5.14 due to this all, I just dropped it.

> >   and the biggy
> > case didn't even use "get_unaligned()").
>
> Indeed this series is sort of orthogonal to that bug, but IMO that bug
> still exists in 5.13 for -O3 build, granted that is not enabled for !ARC.

Right, the zlib bug is still there.

But Arnd's series wouldn't even fix it: right now inffast has its own
- ugly and slow - special 2-byte-only version of "get_unaligned()",
called "get_unaligned16()".

And because it's ugly and slow, it's not actually used for
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS.

Vineet - maybe the fix is to not take my patch to update to a newer
zlib, but to just fix inffast to use the proper get_unaligned(). Then
Arnd's series _would_ actually fix all this..

              Linus