sched: fix warning in hrtick_start_fair()

Benjamin Herrenschmidt reported:

> I get that on ppc64 ...
>
> In file included from kernel/sched.c:1595:
> kernel/sched_fair.c: In function ‘hrtick_start_fair’:
> kernel/sched_fair.c:902: warning: comparison of distinct pointer types lacks a cast
>
> Probably harmless but annoying.

s64 delta = slice - ran;

-->	delta = max(10000LL, delta);

Probably ppc64's s64 is long vs long long..

I think hpa was looking at sanitizing all these 64bit types across the
architectures.

Use max_t with an explicit type meanwhile.

Reported-by: Benjamin Herrenschmid <benh@kernel.crashing.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index cf2cd6ce4cb25ad2bedc59b94205b33b24f8a9e9..0fe94ea43f3256281ed55ee29dadb17eee468d71 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -899,7 +899,7 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
                 * doesn't make sense. Rely on vruntime for fairness.
                 */
                if (rq->curr != p)
-                       delta = max(10000LL, delta);
+                       delta = max_t(s64, 10000LL, delta);
 
                hrtick_start(rq, delta);
        }