linux-kernel - Re: [PATCH v2 1/2] linux/bits.h: Clarify macro argument names

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Date:   Sat, 10 Aug 2019 12:20:23 -0700
From:   Joe Perches <joe@...ches.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Berg <johannes@...solutions.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] linux/bits.h: Clarify macro argument names

On Thu, 2019-08-08 at 12:46 +0900, Masahiro Yamada wrote:
> On Fri, Aug 2, 2019 at 8:04 AM Rikard Falkeborn
> <rikard.falkeborn@...il.com> wrote:
> > Be a little more verbose to improve readability.
> > 
> > Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
> 
> BTW, I do not understand what the improvement is.
> I tend to regard this as a noise commit.

Non verbose naming clarity is good.

Perhaps adding kernel-doc is good too.

> 
> > ---
> > Changes in v2:
> >   - This patch is new in v2
> > 
> >  include/linux/bits.h | 16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> > 
> > diff --git a/include/linux/bits.h b/include/linux/bits.h
> > index 669d69441a62..d4466aa42a9c 100644
> > --- a/include/linux/bits.h
> > +++ b/include/linux/bits.h
> > @@ -14,16 +14,16 @@
> >  #define BITS_PER_BYTE          8
> > 
> >  /*
> > - * Create a contiguous bitmask starting at bit position @l and ending at
> > - * position @h. For example
> > + * Create a contiguous bitmask starting at bit position @low and ending at
> > + * position @high. For example
> >   * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
> >   */
> > -#define GENMASK(h, l) \
> > -       (((~UL(0)) - (UL(1) << (l)) + 1) & \
> > -        (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
> > +#define GENMASK(high, low) \
> > +       (((~UL(0)) - (UL(1) << (low)) + 1) & \
> > +        (~UL(0) >> (BITS_PER_LONG - 1 - (high))))
> > 
> > -#define GENMASK_ULL(h, l) \
> > -       (((~ULL(0)) - (ULL(1) << (l)) + 1) & \
> > -        (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
> > +#define GENMASK_ULL(high, low) \
> > +       (((~ULL(0)) - (ULL(1) << (low)) + 1) & \
> > +        (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (high))))
> > 
> >  #endif /* __LINUX_BITS_H */
> > --
> > 2.22.0
> > 
> 
>