diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h
--- a/sys/compat/linuxkpi/common/include/linux/slab.h
+++ b/sys/compat/linuxkpi/common/include/linux/slab.h
@@ -91,6 +91,9 @@
 #define	ZERO_SIZE_PTR		((void *)16)
 #define ZERO_OR_NULL_PTR(x)	((x) == NULL || (x) == ZERO_SIZE_PTR)
 
+void *linuxkpi___kmalloc(size_t size, gfp_t flags);
+#define	__kmalloc(_s, _f)	linuxkpi___kmalloc(_s, _f)
+
 static inline gfp_t
 linux_check_m_flags(gfp_t flags)
 {
@@ -106,13 +109,6 @@
 	return (flags & GFP_NATIVE_MASK);
 }
 
-static inline void *
-__kmalloc(size_t size, gfp_t flags)
-{
-	return (malloc(MAX(size, sizeof(struct llist_node)), M_KMALLOC,
-	    linux_check_m_flags(flags)));
-}
-
 static inline void *
 kmalloc_node(size_t size, gfp_t flags, int node)
 {
diff --git a/sys/compat/linuxkpi/common/src/linux_slab.c b/sys/compat/linuxkpi/common/src/linux_slab.c
--- a/sys/compat/linuxkpi/common/src/linux_slab.c
+++ b/sys/compat/linuxkpi/common/src/linux_slab.c
@@ -207,6 +207,18 @@
 	free(c, M_KMALLOC);
 }
 
+void *
+linuxkpi___kmalloc(size_t size, gfp_t flags)
+{
+	size_t _s;
+
+	/* sizeof(struct llist_node) is used for kfree_async(). */
+	_s = MAX(size, sizeof(struct llist_node));
+
+	return (malloc(_s, M_KMALLOC, linux_check_m_flags(flags)));
+}
+
+
 struct lkpi_kmalloc_ctx {
 	size_t size;
 	gfp_t flags;