The patch titled
single bit flip detector
has been removed from the -mm tree. Its filename is
single-bit-flip-detector.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: single bit flip detector
From: Dave Jones <davej@xxxxxxxxxx>
In cases where we detect a single bit has been flipped, we spew the usual
slab corruption message, which users instantly think is a kernel bug. In a
lot of cases, single bit errors are down to bad memory, or other hardware
failure.
This patch adds an extra line to the slab debug messages in those cases, in
the hope that users will try memtest before they report a bug.
000: 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
Single bit error detected. Possibly bad RAM. Run memtest86.
[akpm@xxxxxxxx: cleanups]
Signed-off-by: Dave Jones <davej@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/slab.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff -puN mm/slab.c~single-bit-flip-detector mm/slab.c
--- a/mm/slab.c~single-bit-flip-detector
+++ a/mm/slab.c
@@ -1683,10 +1683,32 @@ static void poison_obj(struct kmem_cache
static void dump_line(char *data, int offset, int limit)
{
int i;
+ unsigned char error = 0;
+ int bad_count = 0;
+
printk(KERN_ERR "%03x:", offset);
- for (i = 0; i < limit; i++)
+ for (i = 0; i < limit; i++) {
+ if (data[offset + i] != POISON_FREE) {
+ error = data[offset + i];
+ bad_count++;
+ }
printk(" %02x", (unsigned char)data[offset + i]);
+ }
printk("\n");
+
+ if (bad_count == 1) {
+ error ^= POISON_FREE;
+ if (!(error & (error - 1))) {
+ printk(KERN_ERR "Single bit error detected. Probably "
+ "bad RAM.\n");
+#ifdef CONFIG_X86
+ printk(KERN_ERR "Run memtest86+ or a similar memory "
+ "test tool.\n");
+#else
+ printk(KERN_ERR "Run a memory test tool.\n");
+#endif
+ }
+ }
}
#endif
_
Patches currently in -mm which might be from davej@xxxxxxxxxx are
origin.patch
git-agpgart.patch
git-cpufreq.patch
git-dvb.patch
remove-silly-messages-from-input-layer.patch
git-libata-all.patch
forcedeth-hardirq-lockdep-warning.patch
tickle-nmi-watchdog-on-serial-output.patch
git-watchdog.patch
sched-dont-print-migration-cost-when-only-1-cpu.patch
fbcon-use-persistent-allocation-for-cursor-blinking.patch
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