Modern processors can detect linear memory accesses and prefetch data
automatically, so there's no need to use prefetch.
Signed-off-by: Mikulas Patocka <mpato...@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) {
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