linux-kernel - Re: [PATCH] sh: use generic uaccess

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Message-ID: <CAMuHMdVZp6aM8DmC-VrOqPwh=9DLSDmeDW0k=thOah-Di2Xh5w@mail.gmail.com>
Date: Tue, 23 Jan 2024 17:35:56 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>, 
	Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] sh: use generic uaccess

Hi Adrian,

On Tue, Jan 23, 2024 at 3:20 PM John Paul Adrian Glaubitz
<glaubitz@...sik.fu-berlin.de> wrote:
> On Tue, 2024-01-23 at 15:14 +0100, Arnd Bergmann wrote:
> > On Tue, Jan 23, 2024, at 14:55, John Paul Adrian Glaubitz wrote:
> > >
> > > Wouldn't that make these operations slower or do you think that GCC is able
> > > to optimize this well enough?
> >
> > It's only single load/store instructions, so it should make no
> > difference. If anything, the generic code should allow the compiler
> > to have better register allocation and produce better output than
> > the assembler version (which is how this avoids the ICE), but it's
> > unlikely to be noticeably either.
>
> I have not seen an ICE on v6.8-rc1 so far. What config was it that triggered it?

v6.8-rc1/sh4-gcc12/sh-allmodconfig
v6.8-rc1/sh4-gcc11/sh-allyesconfig
v6.8-rc1/sh4-gcc13/sh-allmodconfig
v6.8-rc1/sh4-gcc13/sh-allyesconfig

e.g. http://kisskb.ellerman.id.au/kisskb/buildresult/15111229/

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds