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| author |   Uladzislau Rezki (Sony) <urezki@gmail.com> | 2019-07-11 20:59:03 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-12 11:05:46 -0700 |
| commit | 460e42d19a13d49455c5b269e8e0a1b1d522a895 (patch) | |
| tree | 993c113f71022e4b2ed4ca820fd9bb4824de6490 /mm | |
| parent | mm/vmalloc.c: get rid of one single unlink_va() when merge (diff) | |
| download | wireguard-linux-460e42d19a13d49455c5b269e8e0a1b1d522a895.tar.xz wireguard-linux-460e42d19a13d49455c5b269e8e0a1b1d522a895.zip | |
mm/vmalloc.c: switch to WARN_ON() and move it under unlink_va()
Trigger a warning if an object that is about to be freed is detached. We
used to have a BUG_ON(), but even though it is considered as faulty
behaviour that is not a good reason to break a system.
Link: http://lkml.kernel.org/r/20190606120411.8298-5-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmalloc.c | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 857dd8415a2e..84f50d7e40bc 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -534,20 +534,17 @@ link_va(struct vmap_area *va, struct rb_root *root, static __always_inline void unlink_va(struct vmap_area *va, struct rb_root *root) { - /* - * During merging a VA node can be empty, therefore - * not linked with the tree nor list. Just check it. - */ - if (!RB_EMPTY_NODE(&va->rb_node)) { - if (root == &free_vmap_area_root) - rb_erase_augmented(&va->rb_node, - root, &free_vmap_area_rb_augment_cb); - else - rb_erase(&va->rb_node, root); + if (WARN_ON(RB_EMPTY_NODE(&va->rb_node))) + return; - list_del(&va->list); - RB_CLEAR_NODE(&va->rb_node); - } + if (root == &free_vmap_area_root) + rb_erase_augmented(&va->rb_node, + root, &free_vmap_area_rb_augment_cb); + else + rb_erase(&va->rb_node, root); + + list_del(&va->list); + RB_CLEAR_NODE(&va->rb_node); } #if DEBUG_AUGMENT_PROPAGATE_CHECK @@ -1162,8 +1159,6 @@ EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier); static void __free_vmap_area(struct vmap_area *va) { - BUG_ON(RB_EMPTY_NODE(&va->rb_node)); - /* * Remove from the busy tree/list. */ |