Commit 20bf062c authored by Alexander Holler's avatar Alexander Holler Committed by Ingo Molnar
Browse files

x86/memtest: Shorten time for tests

By just reversing the order memtest is using the test patterns,
an additional round to zero the memory is not necessary.

This might save up to a second or even more for setups which are
doing tests on every boot.
Signed-off-by: default avatarAlexander Holler <>
Cc: Yinghai Lu <>
Cc: Linus Torvalds <>
Cc: Andrew Morton <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>

Signed-off-by: default avatarIngo Molnar <>
parent 9611dc7a
......@@ -9,6 +9,7 @@
#include <linux/memblock.h>
static u64 patterns[] __initdata = {
/* The first entry has to be 0 to leave memtest with zeroed memory */
......@@ -110,15 +111,8 @@ void __init early_memtest(unsigned long start, unsigned long end)
printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
for (i = 0; i < memtest_pattern; i++) {
for (i = memtest_pattern-1; i < UINT_MAX; --i) {
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);
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