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/gpu/drm/udl/udl_transfer.c | 7 ------- 1 file changed, 7 deletions(-)
Index: linux-4.16.12/drivers/gpu/drm/udl/udl_transfer.c =================================================================== --- linux-4.16.12.orig/drivers/gpu/drm/udl/udl_transfer.c 2018-05-31 14:48:12.000000000 +0200 +++ linux-4.16.12/drivers/gpu/drm/udl/udl_transfer.c 2018-05-31 14:48:12.000000000 +0200 @@ -13,7 +13,6 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/fb.h> -#include <linux/prefetch.h> #include <asm/unaligned.h>
#include <drm/drmP.h> @@ -51,9 +50,6 @@ static int udl_trim_hline(const u8 *bbac 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; @@ -140,8 +136,6 @@ static void udl_compress_hline16( const u8 *cmd_pixel_start, *cmd_pixel_end = NULL; uint16_t pixel_val16;
- prefetchw((void *) cmd); /* pull in one cache line at least */ - *cmd++ = 0xaf; *cmd++ = 0x6b; *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); @@ -158,7 +152,6 @@ static void udl_compress_hline16( (unsigned long)(pixel_end - pixel) >> log_bpp, (unsigned long)(cmd_buffer_end - 1 - cmd) / 2) << log_bpp);
- prefetch_range((void *) pixel, cmd_pixel_end - pixel); pixel_val16 = get_pixel_val16(pixel, log_bpp);
while (pixel < cmd_pixel_end) {