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| author | Oleg Nesterov <oleg@redhat.com> | 2009-09-23 15:56:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-24 07:21:00 -0700 |
| commit | 989264f4645c183331a1279d513f4b1ddc06e1f5 (patch) | |
| tree | 44dc1d6ae0ba66229a6b9e85ac22a3edc87a4b8d /kernel | |
| parent | 5c01ba49e6647d86bc7576105f82027200d1f303 (diff) | |
| download | linux-stable-989264f4645c183331a1279d513f4b1ddc06e1f5.tar.gz linux-stable-989264f4645c183331a1279d513f4b1ddc06e1f5.tar.bz2 linux-stable-989264f4645c183331a1279d513f4b1ddc06e1f5.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 14 |
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; |