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Commit 417e3152 authored by André Goddard Rosa's avatar André Goddard Rosa Committed by Linus Torvalds
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pid: reduce code size by using a pointer to iterate over array 



It decreases code size by 16 bytes on my gcc 4.4.1 on Core 2:
  text    data     bss     dec     hex filename
  4314    2216       8    6538    198a kernel/pid.o-BEFORE
  4298    2216       8    6522    197a kernel/pid.o-AFTER

Signed-off-by: default avatarAndré Goddard Rosa <andre.goddard@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7be6d991

kernel/pid.c

+2 −3
Original line number Diff line number Diff line
@@ -269,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespace *ns) 
	for (type = 0; type < PIDTYPE_MAX; ++type)

		INIT_HLIST_HEAD(&pid->tasks[type]);



	upid = pid->numbers + ns->level;

	spin_lock_irq(&pidmap_lock);

	for (i = ns->level; i >= 0; i--) {

		upid = &pid->numbers[i];

	for ( ; upid >= pid->numbers; --upid)

		hlist_add_head_rcu(&upid->pid_chain,

				&pid_hash[pid_hashfn(upid->nr, upid->ns)]);

	}

	spin_unlock_irq(&pidmap_lock);



out: