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authorOleg Nesterov <oleg@redhat.com>2009-09-23 15:56:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:21:00 -0700
commit989264f4645c183331a1279d513f4b1ddc06e1f5 (patch)
tree44dc1d6ae0ba66229a6b9e85ac22a3edc87a4b8d
parent5c01ba49e6647d86bc7576105f82027200d1f303 (diff)
do_wait-wakeup-optimization: simplify task_pid_type()
task_pid_type() is only used by eligible_pid() which has to check wo_type != PIDTYPE_MAX anyway. Remove this check from task_pid_type() and factor out ->pids[type] access, this shrinks .text a bit and simplifies the code. The matches the behaviour of other similar helpers, say get_task_pid(). The caller must ensure that pid_type is valid, not the callee. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/exit.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 3fb9a77863d5..650c1d1a55d0 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1101,17 +1101,15 @@ struct wait_opts {
int notask_error;
};
-static struct pid *task_pid_type(struct task_struct *task, enum pid_type type)
+static inline
+struct pid *task_pid_type(struct task_struct *task, enum pid_type type)
{
- struct pid *pid = NULL;
- if (type == PIDTYPE_PID)
- pid = task->pids[type].pid;
- else if (type < PIDTYPE_MAX)
- pid = task->group_leader->pids[type].pid;
- return pid;
+ if (type != PIDTYPE_PID)
+ task = task->group_leader;
+ return task->pids[type].pid;
}
-static inline int eligible_pid(struct wait_opts *wo, struct task_struct *p)
+static int eligible_pid(struct wait_opts *wo, struct task_struct *p)
{
return wo->wo_type == PIDTYPE_MAX ||
task_pid_type(p, wo->wo_type) == wo->wo_pid;