linux/bitmap.h: add bitmap_empty helper
Import this function from Linux.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20240617-b4-qcom-rpmh-v1-1-bd2336923e0a@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 0a8503a..40ca221 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -196,6 +196,14 @@
}
}
+static inline bool bitmap_empty(const unsigned long *src, unsigned int nbits)
+{
+ if (small_const_nbits(nbits))
+ return !(*src & BITMAP_LAST_WORD_MASK(nbits));
+
+ return find_first_bit(src, nbits) == nbits;
+}
+
static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
const unsigned long *src2, unsigned int nbits)
{