diff --git a/drivers/gpu/drm/nouveau/core/core/ramht.c b/drivers/gpu/drm/nouveau/core/core/ramht.c
index 86a64045dd602973a7c78bcef213bc2d3571d662..f3b9bddc3875f9254c93ab65c9345642cd4d82b2 100644
--- a/drivers/gpu/drm/nouveau/core/core/ramht.c
+++ b/drivers/gpu/drm/nouveau/core/core/ramht.c
@@ -22,7 +22,6 @@
 
 #include <core/object.h>
 #include <core/ramht.h>
-#include <core/math.h>
 
 #include <subdev/bar.h>
 
@@ -104,6 +103,6 @@ nouveau_ramht_new(struct nouveau_object *parent, struct nouveau_object *pargpu,
 	if (ret)
 		return ret;
 
-	ramht->bits = log2i(nv_gpuobj(ramht)->size >> 3);
+	ramht->bits = order_base_2(nv_gpuobj(ramht)->size >> 3);
 	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nv50.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nv50.c
index e9b8217d00759174cabda39655a79fe098d5dbbf..7e5dff51d3c553a4dbad93b0e56dd7e8ab7c78f7 100644
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nv50.c
@@ -26,7 +26,6 @@
 #include <core/engctx.h>
 #include <core/ramht.h>
 #include <core/class.h>
-#include <core/math.h>
 
 #include <subdev/timer.h>
 #include <subdev/bar.h>
@@ -278,7 +277,7 @@ nv50_fifo_chan_ctor_ind(struct nouveau_object *parent,
 		return ret;
 
 	ioffset = args->ioffset;
-	ilength = log2i(args->ilength / 8);
+	ilength = order_base_2(args->ilength / 8);
 
 	nv_wo32(base->ramfc, 0x3c, 0x403f6078);
 	nv_wo32(base->ramfc, 0x44, 0x01003fff);
diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nv84.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nv84.c
index 7f53196cff52ea176802a5d2df579507ae33c2fe..433b2d8b73b2a05592a638d794ea6a807c2b0b8c 100644
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nv84.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nv84.c
@@ -28,7 +28,6 @@
 #include <core/ramht.h>
 #include <core/event.h>
 #include <core/class.h>
-#include <core/math.h>
 
 #include <subdev/timer.h>
 #include <subdev/bar.h>
@@ -258,7 +257,7 @@ nv84_fifo_chan_ctor_ind(struct nouveau_object *parent,
 	nv_parent(chan)->object_detach = nv50_fifo_object_detach;
 
 	ioffset = args->ioffset;
-	ilength = log2i(args->ilength / 8);
+	ilength = order_base_2(args->ilength / 8);
 
 	nv_wo32(base->ramfc, 0x3c, 0x403f6078);
 	nv_wo32(base->ramfc, 0x44, 0x01003fff);
diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c
index 46dfa68c47bbd84ca4c30d07955111aab2bb29b5..ce92f289e7514aaede4d6aa3c9dc15312cc59410 100644
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c
@@ -29,7 +29,6 @@
 #include <core/engctx.h>
 #include <core/event.h>
 #include <core/class.h>
-#include <core/math.h>
 #include <core/enum.h>
 
 #include <subdev/timer.h>
@@ -200,7 +199,7 @@ nvc0_fifo_chan_ctor(struct nouveau_object *parent,
 
 	usermem = chan->base.chid * 0x1000;
 	ioffset = args->ioffset;
-	ilength = log2i(args->ilength / 8);
+	ilength = order_base_2(args->ilength / 8);
 
 	for (i = 0; i < 0x1000; i += 4)
 		nv_wo32(priv->user.mem, usermem + i, 0x00000000);
diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
index 09644fa9602ca09d7a788d147465a3dbd5dbd17c..8e8121abe31b5b9153ce745ed5b076feb811f3a9 100644
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
@@ -29,7 +29,6 @@
 #include <core/engctx.h>
 #include <core/event.h>
 #include <core/class.h>
-#include <core/math.h>
 #include <core/enum.h>
 
 #include <subdev/timer.h>
@@ -240,7 +239,7 @@ nve0_fifo_chan_ctor(struct nouveau_object *parent,
 
 	usermem = chan->base.chid * 0x200;
 	ioffset = args->ioffset;
-	ilength = log2i(args->ilength / 8);
+	ilength = order_base_2(args->ilength / 8);
 
 	for (i = 0; i < 0x200; i += 4)
 		nv_wo32(priv->user.mem, usermem + i, 0x00000000);
diff --git a/drivers/gpu/drm/nouveau/core/include/core/math.h b/drivers/gpu/drm/nouveau/core/include/core/math.h
deleted file mode 100644
index f808131c5cd87e6077800b7ab08eb0d779cdec95..0000000000000000000000000000000000000000
--- a/drivers/gpu/drm/nouveau/core/include/core/math.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef __NOUVEAU_MATH_H__
-#define __NOUVEAU_MATH_H__
-
-static inline int
-log2i(u64 base)
-{
-	u64 temp = base >> 1;
-	int log2;
-
-	for (log2 = 0; temp; log2++, temp >>= 1) {
-	}
-
-	return (base & (base - 1)) ? log2 + 1: log2;
-}
-
-#endif
diff --git a/drivers/gpu/drm/nouveau/core/os.h b/drivers/gpu/drm/nouveau/core/os.h
index 3bd9be2ab37f6f11e125d6bd44a3d41904016117..d48683a825853020b9816ef1e86181ab5c92fdb8 100644
--- a/drivers/gpu/drm/nouveau/core/os.h
+++ b/drivers/gpu/drm/nouveau/core/os.h
@@ -13,11 +13,12 @@
 #include <linux/i2c-algo-bit.h>
 #include <linux/delay.h>
 #include <linux/io-mapping.h>
-#include <linux/vmalloc.h>
 #include <linux/acpi.h>
+#include <linux/vmalloc.h>
 #include <linux/dmi.h>
 #include <linux/reboot.h>
 #include <linux/interrupt.h>
+#include <linux/log2.h>
 
 #include <asm/unaligned.h>