diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index cf199038f069..30f2b59c47bf 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -91,14 +91,14 @@ EXPORT_SYMBOL(fb_get_color_depth);
 /*
  * Data padding functions.
  */
-void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
+void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, const u8 *src, u32 s_pitch, u32 height)
 {
 	__fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 }
 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 
-void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
-				u32 shift_high, u32 shift_low, u32 mod)
+void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, const u8 *src, u32 idx, u32 height,
+			     u32 shift_high, u32 shift_low, u32 mod)
 {
 	u8 mask = (u8) (0xff << shift_high), tmp;
 	int i, j;
diff --git a/include/linux/fb.h b/include/linux/fb.h
index b27943719fab..5178a33c752c 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -602,9 +602,9 @@ extern int register_framebuffer(struct fb_info *fb_info);
 extern void unregister_framebuffer(struct fb_info *fb_info);
 extern int devm_register_framebuffer(struct device *dev, struct fb_info *fb_info);
 extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
-extern void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx,
-				u32 height, u32 shift_high, u32 shift_low, u32 mod);
-extern void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height);
+void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, const u8 *src, u32 idx, u32 height,
+			     u32 shift_high, u32 shift_low, u32 mod);
+void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, const u8 *src, u32 s_pitch, u32 height);
 extern void fb_set_suspend(struct fb_info *info, int state);
 extern int fb_get_color_depth(struct fb_var_screeninfo *var,
 			      struct fb_fix_screeninfo *fix);
@@ -630,8 +630,8 @@ static inline struct device *dev_of_fbinfo(const struct fb_info *info)
 #endif
 }
 
-static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
-					   u8 *src, u32 s_pitch, u32 height)
+static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, const u8 *src, u32 s_pitch,
+					   u32 height)
 {
 	u32 i, j;