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Commit 037dde41 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Bartlomiej Zolnierkiewicz
Browse files

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: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
parent 8f3c39b8

drivers/video/fbdev/udlfb.c

+0 −8
Original line number Diff line number Diff line
@@ -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;