From: Ben Hutchings <ben@decadent.org.uk>
Date: Mon, 5 Dec 2011 04:00:58 +0000 (+0000)
Subject: x86: memtest: WARN if bad RAM found
X-Git-Tag: archive/raspbian/6.12.27-1+rpi1^2~28
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=c468ea9f6b697f2c9935524dc013a3de8a9c81bb;p=linux.git

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 c2c609c3911..bf422881390 100644
--- 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);