linux-kernel - Re: [PATCH v10 00/10] Introduce the for_each_set

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Date:   Sun, 24 Mar 2019 09:53:59 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Phil Reid <preid@...ctromag.com.au>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v10 00/10] Introduce the for_each_set_clump8 macro

On Sun, Mar 24, 2019 at 5:07 AM William Breathitt Gray
<vilhelm.gray@...il.com> wrote:
> On Fri, Mar 22, 2019 at 09:12:02PM +0200, Andy Shevchenko wrote:
> > On Thu, Mar 14, 2019 at 09:29:32PM +0900, William Breathitt Gray wrote:
> > > Changes in v10:
> > >   - Fix off-by-one error in bitmap initialization in the
> > >     test_for_each_set_clump8 function
> > >   - Fix typos in clump_exp array definition in test_bitmap.c ("0x28"
> > >     should have been "0x38")
> > >   - Utilize for_each_set_clump8 macro in intel_soc_dts_iosf.c
> >
> > One more, can you look at gen_74x164_set_multiple() ? It seems a candidate as
> > well, if I'm not mistaken.
>
> We can utilize the for_each_set_clump8 macro in the
> gen_74x164_set_multiple function, but I skipped over it earlier since I
> noticed it used the BITS_PER_BYTE define rather than a hardcoded 8. If
> it always loops 8 bits at a time, then we can use the
> for_each_set_clump8 macro; otherwise we would need the more generic
> for_each_set_clump macro to handle the non-8-bit looping cases.
>
> Will BITS_PER_BYTE always be defined as 8 bits?

Yes, Linux cannot run on platforms where BITS_PER_BYTE != 8
(no 9-bit bytes ;)

include/linux/bits.h:#define BITS_PER_BYTE              8

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