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Subject[PATCH] x86: memtest: WARN if bad RAM found
From: Ben Hutchings <>
Date: Mon, 5 Dec 2011 04:00:58 +0000

Since this is not a particularly thorough test, if we find any bad
bits of RAM then there is a fair chance that there are other bad bits
we fail to detect.

Signed-off-by: Ben Hutchings <>
Signed-off-by: Jonathan Nieder <>

The patch below comes from this discussion;bug=613321

and has been in use in Debian kernels since last December. The
rationale does not seem particularly distro-specific, and all in all
it looks to me like a good change.

Nothing urgent here. I imagine this patch as targetted to v3.5.


arch/x86/mm/memtest.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index c80b9fb95734..38caeb44a218 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -30,6 +30,8 @@ static u64 patterns[] __initdata = {

static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
+ WARN_ONCE(1, "Bad RAM detected. Use memtest86+ to perform a thorough test\n"
+ "and the memmap= parameter to reserve the bad areas.");
printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
(unsigned long long) pattern,
(unsigned long long) start_bad,

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