slub: cure list_slab_objects() from double fix

According to Christopher Lameter two fixes have been merged for the same
problem.  As far as I can tell, the code does not acquire the list_lock
and invoke kmalloc().  list_slab_objects() misses an unlock (the
counterpart to get_map()) and the memory allocated in free_partial()
isn't used.

Revert the mentioned commit.

Link: http://lkml.kernel.org/r/20200618201234.795692-1-bigeasy@linutronix.de
Fixes: aa456c7aebb14 ("slub: remove kmalloc under list_lock from list_slab_objects() V2")
Link: https://lkml.kernel.org/r/alpine.DEB.2.22.394.2006181501480.12014@www.lameter.com
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slub.c b/mm/slub.c
index fe81773..ef30307 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3766,15 +3766,13 @@ error:
 }
 
 static void list_slab_objects(struct kmem_cache *s, struct page *page,
-                             const char *text, unsigned long *map)
+                             const char *text)
 {
 #ifdef CONFIG_SLUB_DEBUG
        void *addr = page_address(page);
+       unsigned long *map;
        void *p;
 
-       if (!map)
-               return;
-
        slab_err(s, page, text, s->name);
        slab_lock(page);
 
@@ -3786,6 +3784,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
                        print_tracking(s, p);
                }
        }
+       put_map(map);
        slab_unlock(page);
 #endif
 }
@@ -3799,11 +3798,6 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
 {
        LIST_HEAD(discard);
        struct page *page, *h;
-       unsigned long *map = NULL;
-
-#ifdef CONFIG_SLUB_DEBUG
-       map = bitmap_alloc(oo_objects(s->max), GFP_KERNEL);
-#endif
 
        BUG_ON(irqs_disabled());
        spin_lock_irq(&n->list_lock);
@@ -3813,16 +3807,11 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
                        list_add(&page->slab_list, &discard);
                } else {
                        list_slab_objects(s, page,
-                         "Objects remaining in %s on __kmem_cache_shutdown()",
-                         map);
+                         "Objects remaining in %s on __kmem_cache_shutdown()");
                }
        }
        spin_unlock_irq(&n->list_lock);
 
-#ifdef CONFIG_SLUB_DEBUG
-       bitmap_free(map);
-#endif
-
        list_for_each_entry_safe(page, h, &discard, slab_list)
                discard_slab(s, page);
 }