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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/mm/slab.c b/mm/slab.c
index b0414d12fd08..a7f9c244aac6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1941,8 +1941,8 @@ 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 */
@@ -3051,8 +3051,9 @@ 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);