x86: memtest: WARN if bad RAM found

Bug-Debian: https://bugs.debian.org/613321
Forwarded: https://lore.kernel.org/all/20120402150522.GA4980@burratino/

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 <ben@decadent.org.uk>
Gbp-Pq: Topic features/x86
Gbp-Pq: Name x86-memtest-WARN-if-bad-RAM-found.patch

diff --git a/mm/memtest.c b/mm/memtest.c
index c2c609c3911994a8a877b16a6194860e573f8331..bf422881390fbc62e5162ce986157a1fc0954e92 100644 (file)
--- a/mm/memtest.c
+++ b/mm/memtest.c
@@ -31,6 +31,10 @@ static u64 patterns[] __initdata = {
 
 static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad)
 {
+#ifdef CONFIG_X86
+       WARN_ONCE(1, "Bad RAM detected. Use memtest86+ to perform a thorough test\n"
+                 "and the memmap= parameter to reserve the bad areas.");
+#endif
        pr_info("  %016llx bad mem addr %pa - %pa reserved\n",
                cpu_to_be64(pattern), &start_bad, &end_bad);
        memblock_reserve(start_bad, end_bad - start_bad);