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authorMikulas Patocka <mpatocka@redhat.com>2018-07-25 16:41:57 +0300
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2018-07-25 16:41:57 +0300
commit037dde4113b5d1f886cb621d538438e7af7b6967 (patch)
tree5577e02bb67c27e63817acaf01a3605b23f5bcfe /drivers/video
parent8f3c39b8565df2504d727be2ed6d2643bae2b317 (diff)
downloadlinux-037dde4113b5d1f886cb621d538438e7af7b6967.tar.xz
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>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/udlfb.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c
index 22e6a2bc4722..589e3fba447b 100644
--- a/drivers/video/fbdev/udlfb.c
+++ b/drivers/video/fbdev/udlfb.c
@@ -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;