Messages in this thread | | | Date | Fri, 7 Dec 2012 22:40:10 +0900 | Subject | Re: [RFC PATCH 1/8] mm, vmalloc: change iterating a vmlist to find_vm_area() | From | JoonSoo Kim <> |
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Hello, Pekka.
2012/12/7 Pekka Enberg <penberg@kernel.org>: > On Thu, Dec 6, 2012 at 6:09 PM, Joonsoo Kim <js1304@gmail.com> wrote: >> The purpose of iterating a vmlist is finding vm area with specific >> virtual address. find_vm_area() is provided for this purpose >> and more efficient, because it uses a rbtree. >> So change it. > > You no longer take the 'vmlist_lock'. This is safe, because...?
As Bob mentioned, find_vm_area() hold a 'vmap_area_lock' during searching a area. When we hold a 'vmap_area_lock', area can't be removed. So this change is safe.
Thanks.
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