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Subject[PATCH] x86: memtest: shorten time for tests
Date
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: Alexander Holler <holler@ahsoftware.de>
---
arch/x86/mm/memtest.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index c80b9fb..8dabbed 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -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 */
0,
0xffffffffffffffffULL,
0x5555555555555555ULL,
@@ -110,15 +111,8 @@ void __init early_memtest(unsigned long start, unsigned long end)
return;

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);
- }
}
--
1.8.1.2


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