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diff --git a/sys/compat/linuxkpi/common/include/linux/bitops.h b/sys/compat/linuxkpi/common/include/linux/bitops.h
--- a/sys/compat/linuxkpi/common/include/linux/bitops.h
+++ b/sys/compat/linuxkpi/common/include/linux/bitops.h
@@ -62,10 +62,10 @@
#define hweight64(x) bitcount64(x)
#define hweight_long(x) bitcountl(x)
-#define HWEIGHT8(x) (bitcount8((uint8_t)(x)))
-#define HWEIGHT16(x) (bitcount16(x))
-#define HWEIGHT32(x) (bitcount32(x))
-#define HWEIGHT64(x) (bitcount64(x))
+#define HWEIGHT8(x) (__builtin_popcountg((uint8_t)(x)))
+#define HWEIGHT16(x) (__builtin_popcountg((uint16_t)(x)))
+#define HWEIGHT32(x) (__builtin_popcountg((uint32_t)(x)))
+#define HWEIGHT64(x) (__builtin_popcountg((uint64_t)(x)))
static inline int
__ffs(int mask)

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