linux-kernel - Re: [PATCH] sh: sq: Use the bitmap API when applicable

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Message-ID: <CAMuHMdU1zN4Eo52T+AhJtJqBM0woW8vvTgysniMd_nv207NjgA@mail.gmail.com>
Date:   Sun, 26 Jun 2022 12:01:50 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] sh: sq: Use the bitmap API when applicable

Hi Christophe,

On Sat, Jun 25, 2022 at 9:45 AM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
> Using the bitmap API is less verbose than hand writing them.
> It also improves the semantic.

Thanks for your patch!

> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> I don't cross compile, so this patch is NOT compile-tested.

Why not? Cross-compiling is so easy nowadays?
Many distros even provide cross-compilers ("apt install gcc-sh4-linux-gnu").
Else try https://mirrors.edge.kernel.org/pub/tools/crosstool/.

> --- a/arch/sh/kernel/cpu/sh4/sq.c
> +++ b/arch/sh/kernel/cpu/sh4/sq.c

> @@ -382,7 +381,7 @@ static int __init sq_api_init(void)
>         if (unlikely(!sq_cache))
>                 return ret;
>
> -       sq_bitmap = kzalloc(size, GFP_KERNEL);
> +       sq_bitmap = bitmap_zalloc(nr_pages, GFP_KERNEL);

Perhaps you need #include <linux/bitmap.h>?

I don't know, I also didn't bother to cross-compile. Why would I? ;-)

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