mm, vmalloc: only call setup_vmalloc_vm() only in __get_vm_area_node()
authorZhang Yanfei <zhangyanfei@cn.fujitsu.com>
Wed, 3 Jul 2013 22:04:47 +0000 (15:04 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 3 Jul 2013 23:07:40 +0000 (16:07 -0700)
commitd82b1d85760a8344d06272da67f0684243235fac
tree6c34cf40cd173a85fbcd9c0e2df66200077f92e5
parent543cc115339baa44fbea877b3d8673aca652622f
mm, vmalloc: only call setup_vmalloc_vm() only in __get_vm_area_node()

Now for insert_vmalloc_vm, it only calls the two functions:

 - setup_vmalloc_vm: fill vm_struct and vmap_area instances
 - clear_vm_unlist: clear VM_UNLIST bit in vm_struct->flags

So in __get_vm_area_node(), if VM_UNLIST bit unset in flags, that is the
else branch here, we don't need to clear VM_UNLIST bit for vm->flags since
this bit is obviously not set.  That is to say, we could only call
setup_vmalloc_vm instead of insert_vmalloc_vm here.  And then we could
even remove the if test here.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmalloc.c