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udlfb: avoid prefetch 

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>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Mikulas Patocka 2018-07-25 15:41:57 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 8f3c39b856
commit 037dde4113
1 changed files with 0 additions and 8 deletions
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8
drivers/video/fbdev/udlfb.c
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@ -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 *bback, const u8 **bfront, int *width_bytes)
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;