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authorOleg Nesterov <oleg@redhat.com>2008-11-17 15:40:01 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-17 16:55:54 +0100
commitce394471d13bf071939a9a0b48c64c297676d233 (patch)
treeee67e3b6290218b6ecaebd09c1898cde2f3bd95a /kernel
parent74fcd524e808975dd546dac847119f1995a7c622 (diff)
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thread_group_cputime: kill the bogus ->signal != NULL check
Impact: simplify the code thread_group_cputime() is called by current when it must have the valid ->signal, or under ->siglock, or under tasklist_lock after the ->signal check, or the caller is wait_task_zombie() which reaps the child. In any case ->signal can't be NULL. But the point of this patch is not optimization. If it is possible to call thread_group_cputime() when ->signal == NULL we are doing something wrong, and we should not mask the problem. thread_group_cputime() fills *times and the caller will use it, if we silently use task_struct->*times* we report the wrong values. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/posix-cpu-timers.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 895337b16a2..3f4377e0aa0 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -58,21 +58,21 @@ void thread_group_cputime(
struct task_struct *tsk,
struct task_cputime *times)
{
- struct signal_struct *sig;
+ struct task_cputime *totals, *tot;
int i;
- struct task_cputime *tot;
- sig = tsk->signal;
- if (unlikely(!sig) || !sig->cputime.totals) {
+ totals = tsk->signal->cputime.totals;
+ if (!totals) {
times->utime = tsk->utime;
times->stime = tsk->stime;
times->sum_exec_runtime = tsk->se.sum_exec_runtime;
return;
}
+
times->stime = times->utime = cputime_zero;
times->sum_exec_runtime = 0;
for_each_possible_cpu(i) {
- tot = per_cpu_ptr(tsk->signal->cputime.totals, i);
+ tot = per_cpu_ptr(totals, i);
times->utime = cputime_add(times->utime, tot->utime);
times->stime = cputime_add(times->stime, tot->stime);
times->sum_exec_runtime += tot->sum_exec_runtime;