[merged] mm-vmallocc-switch-to-warn_on-and-move-it-under-unlink_va.patch removed from -mm tree

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The patch titled
     Subject: mm/vmalloc.c: switch to WARN_ON() and move it under unlink_va()
has been removed from the -mm tree.  Its filename was
     mm-vmallocc-switch-to-warn_on-and-move-it-under-unlink_va.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: "Uladzislau Rezki (Sony)" <urezki@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Hillf Danton <hdanton@xxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@xxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/vmalloc.c |   25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

--- a/mm/vmalloc.c~mm-vmallocc-switch-to-warn_on-and-move-it-under-unlink_va
+++ a/mm/vmalloc.c
@@ -534,20 +534,17 @@ link_va(struct vmap_area *va, struct rb_
 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_
 
 static void __free_vmap_area(struct vmap_area *va)
 {
-	BUG_ON(RB_EMPTY_NODE(&va->rb_node));
-
 	/*
 	 * Remove from the busy tree/list.
 	 */
_

Patches currently in -mm which might be from urezki@xxxxxxxxx are





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