linux-kernel - [PATCH 2/2] pid: reduce code size by using a pointer to iterate over array

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Message-Id: <5aa52119c3a7c541e2d488478d6d7da920e7cdb6.1258805412.git.andre.goddard@gmail.com>
Date:	Sat, 21 Nov 2009 10:16:20 -0200
From:	André Goddard Rosa <andre.goddard@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	André Goddard Rosa <andre.goddard@...il.com>
Subject: [PATCH 2/2] 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: André Goddard Rosa <andre.goddard@...il.com>
---
 kernel/pid.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 55fd590..2e17c9c 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -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:
-- 
1.6.5.3.298.g39add

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