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-rw-r--r--mm/slab.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 792bfe320a8b..3dbd6f4e7477 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1683,10 +1683,32 @@ static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val)
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