linux-kernel - Re: [PATCH 2/6] bitmap: move some macros from linux/bitmap.h to linux/bitops.h

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Date:   Thu, 21 Jan 2021 12:38:46 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-m68k@...ts.linux-m68k.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-sh@...r.kernel.org, linux-arch@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, Arnd Bergmann <arnd@...db.de>,
        Dennis Zhou <dennis@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        David Sterba <dsterba@...e.com>,
        Stefano Brivio <sbrivio@...hat.com>,
        "Ma, Jianpeng" <jianpeng.ma@...el.com>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: Re: [PATCH 2/6] bitmap: move some macros from linux/bitmap.h to linux/bitops.h

On Thu, Jan 21, 2021 at 2:18 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Wed, Jan 20, 2021 at 04:06:26PM -0800, Yury Norov wrote:
> > In the following patches of the series they are used by
> > find_bit subsystem.
>
> s/subsystem/API/
>
> ...
>
> > --- a/include/linux/bitops.h
> > +++ b/include/linux/bitops.h
> > @@ -7,6 +7,17 @@
> >
> >  #include <uapi/linux/kernel.h>
> >
> > +#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
> > +#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
>
> Hmm... Naming here is not in the bitops namespace.
> I would expect BITS rather than BITMAP for these two.
>
> So, we have at least the following options:
>  - split to a separate header, like bitmap_macros.h
>  - s/BITMAP/BITS/ and either define BITMAP_* as respective BITS_* or rename it
>    everywhere in bitmap.*
>  - your variant
>  - ...???...

We have GENMASK in linux/bits.h. I think we should use it here and
drop local ones.
It will also cover the case of  OFFSET macro that you suggested in
your comment to
patch #5.