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@xxxxxxxxxx>
---
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;
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