linux-kernel - Re: [PATCH v4 2/5] m68k/bitops: use __builtin_{clz,ctzl,ffs} to evaluate constant expressions

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Message-ID: <ca9bd701-1cd0-94b9-e8cb-4a4328dea58a@linux-m68k.org>
Date: Wed, 7 Feb 2024 17:31:08 +1100 (AEDT)
From: Finn Thain <fthain@...ux-m68k.org>
To: Vincent MAILHOL <mailhol.vincent@...adoo.fr>
cc: David Laight <David.Laight@...lab.com>, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
    Yury Norov <yury.norov@...il.com>, 
    Nick Desaulniers <ndesaulniers@...gle.com>, 
    Douglas Anderson <dianders@...omium.org>, 
    Kees Cook <keescook@...omium.org>, Petr Mladek <pmladek@...e.com>, 
    Randy Dunlap <rdunlap@...radead.org>, 
    Zhaoyang Huang <zhaoyang.huang@...soc.com>, 
    Geert Uytterhoeven <geert+renesas@...der.be>, 
    Marco Elver <elver@...gle.com>, Brian Cain <bcain@...cinc.com>, 
    Geert Uytterhoeven <geert@...ux-m68k.org>, 
    Matthew Wilcox <willy@...radead.org>, 
    "Paul E . McKenney" <paulmck@...nel.org>, 
    "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>
Subject: Re: [PATCH v4 2/5] m68k/bitops: use __builtin_{clz,ctzl,ffs} to
 evaluate constant expressions


On Mon, 5 Feb 2024, Vincent MAILHOL wrote:

> On Mon. 5 Feb. 2024 at 18:48, Finn Thain <fthain@...ux-m68k.org> wrote:
> > On Mon, 5 Feb 2024, Vincent MAILHOL wrote:
> >
> > If clang support is important then clang's builtins are important. So 
> > why not improve those instead? That would resolve the issue in a 
> > win-win.
> 
> I am deeply sorry, but with all your respect, this request is unfair. I 
> will not fix the compiler.
> 

Absolutely. It is unfair. Just as your proposal was unfair to maintainers. 
That patch would make a compiler deficiency into a maintenance burden.