x86: memtest: wipe out test pattern from memory (bfb4dc0d) · Commits · e / devices / android_kernel_fairphone_FP3

arch/x86/mm/memtest.c

+33 −23

Original line number	Diff line number	Diff line
		@@ -57,6 +57,29 @@ static void __init memtest(u64 pattern, u64 start_phys, u64 size)
		reserve_bad_mem(pattern, start_bad, last_bad + incr);
		}

		static void __init do_one_pass(u64 pattern, u64 start, u64 end)
		{
		u64 size = 0;

		while (start < end) {
		start = find_e820_area_size(start, &size, 1);

		/* done ? */
		if (start >= end)
		break;
		if (start + size > end)
		size = end - start;

		printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
		(unsigned long long) start,
		(unsigned long long) start + size,
		(unsigned long long) cpu_to_be64(pattern));
		memtest(pattern, start, size);

		start += size;
		}
		}

		/* default is disabled */
		static int memtest_pattern __initdata;

		@@ -71,35 +94,22 @@ early_param("memtest", parse_memtest);

		void __init early_memtest(unsigned long start, unsigned long end)
		{
		u64 t_start, t_size;
		unsigned int i;
		u64 pattern;
		unsigned int idx = 0;

		if (!memtest_pattern)
		return;

		printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
		for (i = 0; i < memtest_pattern; i++) {
		unsigned int idx = i % ARRAY_SIZE(patterns);
		pattern = patterns[idx];
		t_start = start;
		t_size = 0;
		while (t_start < end) {
		t_start = find_e820_area_size(t_start, &t_size, 1);

		/* done ? */
		if (t_start >= end)
		break;
		if (t_start + t_size > end)
		t_size = end - t_start;

		printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
		(unsigned long long) t_start,
		(unsigned long long) t_start + t_size,
		(unsigned long long) cpu_to_be64(pattern));
		memtest(pattern, t_start, t_size);

		t_start += t_size;
		idx = i % ARRAY_SIZE(patterns);
		do_one_pass(patterns[idx], start, end);
		}

		if (idx > 0) {
		printk(KERN_INFO "early_memtest: wipe out "
		"test pattern from memory\n");
		/* additional test with pattern 0 will do this */
		do_one_pass(0, start, end);
		}
		}