Commit-ID: 20bf062c6575e162ede00308ca3a5714ca112009 Gitweb: http://git.kernel.org/tip/20bf062c6575e162ede00308ca3a5714ca112009 Author: Alexander Holler <hol...@ahsoftware.de> AuthorDate: Sat, 16 Feb 2013 16:38:17 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Mon, 18 Feb 2013 09:28:42 +0100
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: Alexander Holler <hol...@ahsoftware.de> Cc: Yinghai Lu <ying...@kernel.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/1361029097-8308-1-git-send-email-hol...@ahsoftware.de Signed-off-by: Ingo Molnar <mi...@kernel.org> --- 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); - } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
