On Sat, Jan 30, 2021 at 11:17:15AM -0800, Yury Norov wrote:
> BITMAP_{LAST,FIRST}_WORD_MASK() in linux/bitmap.h duplicates the
> functionality of GENMASK(). The scope of there macros is wider than just
> bitmap. This patch defines 4 new macros: BITS_FIRST(), BITS_LAST(),
> BITS_FIRST_MASK() and BITS_LAST_MASK() in linux/bits.h on top of GENMASK()
> and replaces BITMAP_{LAST,FIRST}_WORD_MASK() to avoid duplication and
> increases scope of the macros.... > include/linux/bitmap.h | 27 ++++++++++++--------------- > include/linux/bits.h | 6 ++++++ > include/linux/cpumask.h | 8 ++++---- > include/linux/netdev_features.h | 2 +- > include/linux/nodemask.h | 2 +- > lib/bitmap.c | 26 +++++++++++++------------- > lib/find_bit.c | 4 ++-- > lib/genalloc.c | 8 ++++---- Answering to your reply. I meant to split the below to a separate patch. > tools/include/linux/bitmap.h | 20 ++++++-------------- > tools/include/linux/bits.h | 6 ++++++ > tools/lib/bitmap.c | 6 +++--- > tools/lib/find_bit.c | 2 +- > tools/testing/radix-tree/bitmap.c | 4 ++-- ... > +#define BITS_FIRST(nr) GENMASK((nr), 0) > +#define BITS_LAST(nr) GENMASK(BITS_PER_LONG - 1, (nr)) > + > +#define BITS_FIRST_MASK(nr) BITS_FIRST((nr) % BITS_PER_LONG) > +#define BITS_LAST_MASK(nr) BITS_LAST((nr) % BITS_PER_LONG) Any pointers to the difference in generated code for popular architectures (x86. x86_64, arm, aarch64, ppc, ppc64)? -- With Best Regards, Andy Shevchenko
