From 68062b86fc0f480b806d270a8278709a5a41bb67 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Wed, 6 Dec 2006 20:36:53 -0800 Subject: [PATCH] [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 Acked-by: Shailabh Nagar Cc: Balbir Singh Cc: Jay Lan Cc: Thomas Graf Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/taskstats.c | 55 +++++++++++++++++++++++----------------------- 1 file changed, 28 insertions(+), 27 deletions(-) diff --git a/kernel/taskstats.c b/kernel/taskstats.c index 7d793d6b1e90..d2a41339f37b 100644 --- a/kernel/taskstats.c +++ b/kernel/taskstats.c @@ -343,6 +343,25 @@ static int parse(struct nlattr *na, cpumask_t *mask) return ret; } +static int mk_reply(struct sk_buff *skb, int type, u32 pid, struct taskstats *stats) +{ + struct nlattr *na; + int aggr; + + aggr = TASKSTATS_TYPE_AGGR_TGID; + if (type == TASKSTATS_TYPE_PID) + aggr = TASKSTATS_TYPE_AGGR_PID; + + na = nla_nest_start(skb, aggr); + NLA_PUT_U32(skb, type, pid); + NLA_PUT_TYPE(skb, struct taskstats, TASKSTATS_TYPE_STATS, *stats); + nla_nest_end(skb, na); + + return 0; +nla_put_failure: + return -1; +} + static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) { int rc = 0; @@ -350,7 +369,6 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) struct taskstats stats; void *reply; size_t size; - struct nlattr *na; cpumask_t mask; rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], &mask); @@ -382,27 +400,21 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) if (rc < 0) goto err; - na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID); - NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, pid); - NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, - stats); + if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid, &stats)) + goto nla_put_failure; } else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) { u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); rc = fill_tgid(tgid, NULL, &stats); if (rc < 0) goto err; - na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID); - NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, tgid); - NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, - stats); + if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid, &stats)) + goto nla_put_failure; } else { rc = -EINVAL; goto err; } - nla_nest_end(rep_skb, na); - return send_reply(rep_skb, info->snd_pid); nla_put_failure: @@ -446,7 +458,6 @@ void taskstats_exit(struct task_struct *tsk, int group_dead) void *reply; size_t size; int is_thread_group; - struct nlattr *na; if (!family_registered) return; @@ -481,27 +492,17 @@ void taskstats_exit(struct task_struct *tsk, int group_dead) if (rc < 0) goto err_skb; - na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID); - NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, (u32)tsk->pid); - NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, - *tidstats); - nla_nest_end(rep_skb, na); - - if (!is_thread_group) - goto send; + if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid, tidstats)) + goto nla_put_failure; /* * Doesn't matter if tsk is the leader or the last group member leaving */ - if (!group_dead) + if (!is_thread_group || !group_dead) goto send; - na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID); - NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, (u32)tsk->tgid); - /* No locking needed for tsk->signal->stats since group is dead */ - NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, - *tsk->signal->stats); - nla_nest_end(rep_skb, na); + if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid, tsk->signal->stats)) + goto nla_put_failure; send: send_cpu_listeners(rep_skb, listeners); -- 2.30.2