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    Subject[PATCH resend] 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.

    Warn so the TAINT_WARNING flag shows up in panic traces and other bug
    reports from users that enabled memtest and found bad RAM during
    bootup, to help people debugging to see that problems are potentially
    due to unreliable RAM. The warning text gives advice that can be used
    to make the warning go away using a more thorough test:

    Bad RAM detected. Use memtest86+ to perform a thorough test
    and the memmap= parameter to reserve the bad areas.

    In this way, this patch should make the lives of people helping to
    analyze bug reports from builds with CONFIG_MEMTEST enabled easier.

    [jn: more explanation of impact]
    Signed-off-by: Ben Hutchings <>
    Signed-off-by: Jonathan Nieder <>
    Hi again,

    The patch below last visited this list on 2 April, about a week and a
    half ago. No reply.

    The patch has been in Debian since last December. I like it. The
    patch is targetted at v3.5, so I would like to see it in linux-next so
    it can get more exposure. Comments?


    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,

     \ /
      Last update: 2012-04-13 21:41    [W:0.020 / U:7.148 seconds]
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