From: Antonino A. Daplas <adaplas@gmail.com>
Date: Fri, 29 Jul 2005 21:03:33 +0000 (-0700)
Subject: [PATCH] fbdev: Replace memcpy with for-loop when preparing bitmap
X-Git-Tag: firefly_0821_release~42541
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e4c5c82024f5f292c0069cf40422b8f3bf5e684e;p=firefly-linux-kernel-4.4.55.git

[PATCH] fbdev: Replace memcpy with for-loop when preparing bitmap

Do not use memcpy in fb_pad_aligned_buffer.  It is suboptimal because only
a few bytes are moved at a time.  Replace with a for-loop.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 40784a944d05..d2e19f6dd72c 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -80,10 +80,12 @@ EXPORT_SYMBOL(fb_get_color_depth);
  */
 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 {
-	int i;
+	int i, j;
 
 	for (i = height; i--; ) {
-		memcpy(dst, src, s_pitch);
+		/* s_pitch is a few bytes at the most, memcpy is suboptimal */
+		for (j = 0; j < s_pitch; j++)
+			dst[j] = src[j];
 		src += s_pitch;
 		dst += d_pitch;
 	}