Modern processors can detect linear memory accesses and prefetch data automatically, so there's no need to use prefetch.
Signed-off-by: Mikulas Patocka mpatocka@redhat.com
--- drivers/video/fbdev/udlfb.c | 8 -------- 1 file changed, 8 deletions(-)
Index: linux-4.17-rc7/drivers/video/fbdev/udlfb.c =================================================================== --- linux-4.17-rc7.orig/drivers/video/fbdev/udlfb.c 2018-05-31 12:48:35.000000000 +0200 +++ linux-4.17-rc7/drivers/video/fbdev/udlfb.c 2018-05-31 12:48:35.000000000 +0200 @@ -25,7 +25,6 @@ #include <linux/fb.h> #include <linux/vmalloc.h> #include <linux/slab.h> -#include <linux/prefetch.h> #include <linux/delay.h> #include <asm/unaligned.h> #include <video/udlfb.h> @@ -375,9 +374,6 @@ static int dlfb_trim_hline(const u8 *bba int start = width; int end = width;
- prefetch((void *) front); - prefetch((void *) back); - for (j = 0; j < width; j++) { if (back[j] != front[j]) { start = j; @@ -454,8 +450,6 @@ static void dlfb_compress_hline( continue; }
- prefetchw((void *) cmd); /* pull in one cache line at least */ - *cmd++ = 0xAF; *cmd++ = 0x6B; *cmd++ = dev_addr >> 16; @@ -479,8 +473,6 @@ static void dlfb_compress_hline( cmd_pixel_end--; }
- prefetch_range((void *) pixel, (u8 *)cmd_pixel_end - (u8 *)pixel); - while (pixel < cmd_pixel_end) { const uint16_t * const repeating_pixel = pixel; u16 pixel_value = *pixel;