linux-kernel - Re: [PATCH -mm] -funsigned-char, x86: make struct p4_event

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Date:   Thu, 20 Oct 2022 16:46:01 -0600
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        mm-commits@...r.kernel.org, masahiroy@...nel.org,
        gregkh@...uxfoundation.org, Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH -mm] -funsigned-char, x86: make struct
 p4_event_bind::cntr signed array

On Fri, Oct 21, 2022 at 12:34:37AM +0300, Andy Shevchenko wrote:
> On Thu, Oct 20, 2022 at 01:17:33PM -0700, Linus Torvalds wrote:
> > On Thu, Oct 20, 2022 at 12:39 PM Linus Torvalds
> > <torvalds@...ux-foundation.org> wrote:
> 
> ...
> 
> > And in some cases the differences are enormous:
> > 
> >  - drivers/net/wireless/ralink/rt2x00/rt2800lib.c generates a 220kB diff
> > 
> > which seems to be due to entirely different inlining decisions or
> > something, and the differences are so enormous that I didn't even
> > start looking at the cause.
> 
> This one is what we start the epopee from. I think Jason handled it in his last
> patch against this certain driver.

Right, and Kale is taking it for 6.1, because it fixes existing breakage
on ARM. But it's not broken on x86 with -funsigned-char.

Jason