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| author | André Goddard Rosa <andre.goddard@gmail.com> | 2009-12-15 16:47:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:12 -0800 |
| commit | 417e315247ebc199d357855bb08d2a5264400565 (patch) | |
| tree | 84383762d1abaebaa00928bbfc23851742d9cf9b /kernel/pid.c | |
| parent | 7be6d991bca63bbcdc5bc3b09789f367a3486537 (diff) | |
| download | lwn-417e315247ebc199d357855bb08d2a5264400565.tar.gz lwn-417e315247ebc199d357855bb08d2a5264400565.zip | |
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@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index 55fd5900bac8..2e17c9c92cbe 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: |