The patch titled
pid: reduce code size by using a pointer to iterate over array
has been added to the -mm tree. Its filename is
pid-reduce-code-size-by-using-a-pointer-to-iterate-over-array.patch
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------------------------------------------------------
Subject: pid: reduce code size by using a pointer to iterate over array
From: André Goddard Rosa <andre.goddard@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/pid.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff -puN kernel/pid.c~pid-reduce-code-size-by-using-a-pointer-to-iterate-over-array kernel/pid.c
--- a/kernel/pid.c~pid-reduce-code-size-by-using-a-pointer-to-iterate-over-array
+++ a/kernel/pid.c
@@ -269,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespa
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:
_
Patches currently in -mm which might be from andre.goddard@xxxxxxxxx are
linux-next.patch
vsprintf-factorize-null-string.patch
vsprintf-pre-calculate-final-string-length-for-later-use.patch
vsprintf-give-it-some-care-to-please-checkpatchpl.patch
vsprintf-use-tolower-whenever-possible.patch
vsprintf-reduce-code-size-by-avoiding-extra-check.patch
vsprintf-move-local-vars-to-block-local-vars-and-remove-unneeded-ones.patch
vsprintf-factor-out-skip_space-code-in-a-separate-function.patch
vsprintf-reuse-almost-identical-simple_strtoulx-functions.patch
ctype-constify-read-only-_ctype-string.patch
string-factorize-skip_spaces-and-export-it-to-be-generally-available.patch
string-on-strstrip-first-remove-leading-spaces-before-running-over-str.patch
tree-wide-convert-open-calls-to-remove-spaces-to-skip_spaces-lib-function.patch
parser-remove-unnecessary-strlen.patch
pid-tighten-pidmap-spinlock-critical-section-by-removing-kfree.patch
pid-reduce-code-size-by-using-a-pointer-to-iterate-over-array.patch
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