On Sat, 2014-06-28 at 21:49 +0200, Antonio Quartulli wrote:
> Hi all,
>
> On 28/06/14 21:13, Joe Perches wrote:
> > diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
[]
> > @@ -896,7 +896,7 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv,
> > enum batadv_uev_type type,
> > {
> > int ret = -ENOMEM;
> > struct kobject *bat_kobj;
> > - char *uevent_env[4] = { NULL, NULL, NULL, NULL };
> > + char *uevent_env[3];
>
>
> Joe, why are you shortening this? kobject_uevent_env() expect a
> NULL-terminating array (that is the forth cell).
Hi Antonio, sorry, I didn't know about the last NULL
being required. It looked to me more like an
oversight in the code instead of a required NULL.
> And how is this change reducing the code space?
Removing unnecessary initializations reduces
object code size.
> For what concerns the labels, we use this pattern mostly all over the
> code: one single label/exit-point with the related NULL checks. Do you
> think that we can improve something by changing this? (I am not talking
> about the fastpath here).
Not calling known unnecessary kfree calls helps a
little. Certainly, it'd be more valuable in any
fast path area.
Other than that, it was an unsigned suggestion
not a formal patch submission.
Ignore it or improve it as you see fit.
cheers, Joe
Maybe:
---
net/batman-adv/sysfs.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
index f40cb04..90c245e 100644
--- a/net/batman-adv/sysfs.c
+++ b/net/batman-adv/sysfs.c
@@ -896,7 +896,7 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv, enum
batadv_uev_type type,
{
int ret = -ENOMEM;
struct kobject *bat_kobj;
- char *uevent_env[4] = { NULL, NULL, NULL, NULL };
+ char *uevent_env[4];
bat_kobj = &bat_priv->soft_iface->dev.kobj;
@@ -910,22 +910,26 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv,
enum batadv_uev_type type,
"%s%s", BATADV_UEV_ACTION_VAR,
batadv_uev_action_str[action]);
if (!uevent_env[1])
- goto out;
+ goto out0;
/* If the event is DEL, ignore the data field */
if (action != BATADV_UEV_DEL) {
uevent_env[2] = kasprintf(GFP_ATOMIC,
"%s%s", BATADV_UEV_DATA_VAR, data);
if (!uevent_env[2])
- goto out;
+ goto out1;
}
+ uevent_env[3] = NULL;
+
ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
-out:
- kfree(uevent_env[0]);
- kfree(uevent_env[1]);
- kfree(uevent_env[2]);
+ kfree(uevent_env[2]);
+out1:
+ kfree(uevent_env[1]);
+out0:
+ kfree(uevent_env[0]);
+out:
if (ret)
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Impossible to send uevent for (%s,%s,%s) event
(err: %d)\n",
--
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