forked from luck/tmp_suning_uos_patched
[PATCH] taskstats: factor out reply assembling
Introduce mk_reply() helper which does all nla_put()s on reply. Saves 453 bytes and a preparation for the next patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Shailabh Nagar <nagar@watson.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Jay Lan <jlan@sgi.com> Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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34ec12349c
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68062b86fc
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@ -343,6 +343,25 @@ static int parse(struct nlattr *na, cpumask_t *mask)
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return ret;
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}
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static int mk_reply(struct sk_buff *skb, int type, u32 pid, struct taskstats *stats)
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{
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struct nlattr *na;
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int aggr;
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aggr = TASKSTATS_TYPE_AGGR_TGID;
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if (type == TASKSTATS_TYPE_PID)
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aggr = TASKSTATS_TYPE_AGGR_PID;
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na = nla_nest_start(skb, aggr);
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NLA_PUT_U32(skb, type, pid);
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NLA_PUT_TYPE(skb, struct taskstats, TASKSTATS_TYPE_STATS, *stats);
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nla_nest_end(skb, na);
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return 0;
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nla_put_failure:
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return -1;
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}
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static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
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{
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int rc = 0;
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@ -350,7 +369,6 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
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struct taskstats stats;
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void *reply;
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size_t size;
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struct nlattr *na;
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cpumask_t mask;
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rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], &mask);
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@ -382,27 +400,21 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
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if (rc < 0)
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goto err;
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na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID);
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NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, pid);
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NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
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stats);
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if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid, &stats))
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goto nla_put_failure;
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} else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) {
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u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]);
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rc = fill_tgid(tgid, NULL, &stats);
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if (rc < 0)
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goto err;
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na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID);
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NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, tgid);
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NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
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stats);
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if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid, &stats))
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goto nla_put_failure;
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} else {
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rc = -EINVAL;
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goto err;
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}
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nla_nest_end(rep_skb, na);
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return send_reply(rep_skb, info->snd_pid);
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nla_put_failure:
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@ -446,7 +458,6 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
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void *reply;
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size_t size;
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int is_thread_group;
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struct nlattr *na;
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if (!family_registered)
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return;
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@ -481,27 +492,17 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
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if (rc < 0)
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goto err_skb;
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na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID);
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NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, (u32)tsk->pid);
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NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
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*tidstats);
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nla_nest_end(rep_skb, na);
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if (!is_thread_group)
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goto send;
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if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid, tidstats))
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goto nla_put_failure;
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/*
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* Doesn't matter if tsk is the leader or the last group member leaving
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*/
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if (!group_dead)
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if (!is_thread_group || !group_dead)
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goto send;
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na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID);
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NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, (u32)tsk->tgid);
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/* No locking needed for tsk->signal->stats since group is dead */
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NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
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*tsk->signal->stats);
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nla_nest_end(rep_skb, na);
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if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid, tsk->signal->stats))
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goto nla_put_failure;
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send:
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send_cpu_listeners(rep_skb, listeners);
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