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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
@@ -57,10 +57,18 @@
#define hweight64(x) bitcount64(x)
#define hweight_long(x) bitcountl(x)
+#if __has_builtin(__builtin_popcountg)
#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)))
+#else
+/* LLVM before 19, gcc before 14. */
+#define HWEIGHT8(x) (__const_bitcount8((uint8_t)(x)))
+#define HWEIGHT16(x) (__const_bitcount16((uint16_t)(x)))
+#define HWEIGHT32(x) (__const_bitcount32((uint32_t)(x)))
+#define HWEIGHT64(x) (__const_bitcount64((uint64_t)(x)))
+#endif
static inline int
__ffs(int mask)

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