slab: add taint flag outputting to debug paths.

When we get corruption reports, it's useful to see if the kernel was
tainted, to rule out problems we can't do anything about.

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <>

diff --git a/mm/slab.c b/mm/slab.c
index 708efe886154da626cfe01f4a2b6eaf055ada914..9ef775470c8b22dff3e52691f57ad94f403d858a 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1927,8 +1927,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
                        /* Print header */
                        if (lines == 0) {
                                printk(KERN_ERR
-                                       "Slab corruption: %s start=%p, len=%d\n",
-                                       cachep->name, realobj, size);
+                                       "Slab corruption (%s): %s start=%p, len=%d\n",
+                                       print_tainted(), cachep->name, realobj, size);
                                print_objinfo(cachep, objp, 0);
                        }
                        /* Hexdump the affected line */
@@ -3037,8 +3037,9 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp)
        if (entries != cachep->num - slabp->inuse) {
 bad:
                printk(KERN_ERR "slab: Internal list corruption detected in "
-                               "cache '%s'(%d), slabp %p(%d). Hexdump:\n",
-                       cachep->name, cachep->num, slabp, slabp->inuse);
+                       "cache '%s'(%d), slabp %p(%d). Tainted(%s). Hexdump:\n",
+                       cachep->name, cachep->num, slabp, slabp->inuse,
+                       print_tainted());
                print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
                        sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
                        1);