On Wed, Jan 20, 2021 at 04:06:30PM -0800, Yury Norov wrote:

Similarly to bitmap functions, users will benefit if we'll handle
a case of small-size bitmaps that fit into a single word.

While here, move the find_last_bit() declaration to bitops/find.h
where other find_*_bit() functions sit.

...

+static inline
+unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
+{
+	if (small_const_nbits(size)) {
+		unsigned long idx;
+
+		if (!*addr)
+			return size;
+
+		idx = __ffs(*addr);

+		return idx < size ? idx : size;

But can't we mask it first, then check for 0 (no bit set) otherwise return the
result of __ffs directly?

Same comment for other similar places.

+	}
+
+	return _find_first_bit(addr, size);
+}

-- 
With Best Regards,
Andy Shevchenko