[PATCH 2/2] x86: memtest: remove unnecessary round to leave memtest with zeroed mem

[Alexander Holler]

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

This makes it a bit faster.

Signed-off-by: Alexander Holler <holler@xxxxxxxxxxxxx>
---
 arch/x86/mm/memtest.c |   11 ++---------
 1 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 855a6d5..da80083 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,7 +9,7 @@
 #include <linux/memblock.h>
 
 static u64 patterns[] __initdata = {
-	0,
+	0, /* Has has to be 0 to leave memtest with zeroed memory */
 	0xffffffffffffffffULL,
 	0x5555555555555555ULL,
 	0xaaaaaaaaaaaaaaaaULL,
@@ -112,15 +112,8 @@ void __init early_memtest(unsigned long start, unsigned long end)
 		return;
 
 	pr_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);
-	}
 }
-- 
1.7.8.6

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