On Thu, Jan 21, 2021 at 2:18 AM Andy Shevchenko
[off-list ref] wrote:

On Wed, Jan 20, 2021 at 04:06:26PM -0800, Yury Norov wrote:

quoted

In the following patches of the series they are used by
find_bit subsystem.

s/subsystem/API/

...

quoted

--- 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.