tree be6cb7c943dfa36ed6e8c4d119aa97fd58e7473f
parent 2b8f6523ad761ea03dc5a1b0e2cc754f63f9580b
author Oleg Nesterov <oleg@redhat.com> 1404145132 +0200
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1404158535 -0700

rcu: Change rcu_dereference_check(c) to check "c" first

Change the order of "c" and "_held" checks in rcu_dereference_check(),
this can help if __builtin_constant_p(c).

CONFIG_DEBUG_LOCK_ALLOC + CONFIG_PROVE_RCU + CONFIG_TREE_RCU_TRACE

	- 5578795 3026776 14757888 23363459
	+ 5542443 3014040 14757888 23314371

saves 49088 bytes according to size vmlinux.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>