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mm/vmalloc.c: get rid of one single unlink_va() when merge 

It does not make sense to try to "unlink" the node that is definitely not
linked with a list nor tree.  On the first merge step VA just points to
the previously disconnected busy area.

On the second step, check if the node has been merged and do "unlink" if
so, because now it points to an object that must be linked.

Link: http://lkml.kernel.org/r/20190606120411.8298-4-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Hillf Danton <hdanton@sina.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
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>
alistair/sunxi64-5.4-dsi
Uladzislau Rezki (Sony) 2019-07-11 20:59:00 -07:00 committed by Linus Torvalds
parent 82dd23e84b
commit 54f63d9d8a
1 changed files with 2 additions and 6 deletions
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8
mm/vmalloc.c
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@ -719,9 +719,6 @@ merge_or_add_vmap_area(struct vmap_area *va,
/* Check and update the tree if needed. */
augment_tree_propagate_from(sibling);
/* Remove this VA, it has been merged. */
unlink_va(va, root);
/* Free vmap_area object. */
kmem_cache_free(vmap_area_cachep, va);
@ -746,12 +743,11 @@ merge_or_add_vmap_area(struct vmap_area *va,
/* Check and update the tree if needed. */
augment_tree_propagate_from(sibling);
/* Remove this VA, it has been merged. */
unlink_va(va, root);
if (merged)
unlink_va(va, root);
/* Free vmap_area object. */
kmem_cache_free(vmap_area_cachep, va);
return;
}
}