linux-kernel - Re: [RFC PATCH 2/2] arch/*/io.h: remove ioremap

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Message-ID: <CAMuHMdV4efVX8X1KoLJ-3pmzsxnU6TODw3b_37ZK771rfrqi7A@mail.gmail.com>
Date:   Tue, 21 Feb 2023 11:03:14 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, arnd@...db.de,
        hch@...radead.org, mcgrof@...nel.org
Subject: Re: [RFC PATCH 2/2] arch/*/io.h: remove ioremap_uc in some architectures

Hi Baoquan,

Thanks for your patch!

On Tue, Feb 21, 2023 at 7:36 AM Baoquan He <bhe@...hat.com> wrote:
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior, everywhere else this is the same as ioremap() anyway.
>
> So here, remove the ioremap_uc() definition in architecutures other
> than x86 and ia64. These architectures all have asm-generic/io.h
> included and will have the default ioremap_uc() definition which
> returns NULL. If any ARCH really needs a specific ioremap_uc() for

Please make it very clear that this changes existing behavior.
At first, I had completely missed that.

And of course the documentation should be updated to reflect that.

> its own usage, one ioremap_uc() can be added in the ARH.

s/ARH/ARCH/

>  arch/m68k/include/asm/kmap.h   | 1 -

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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