From: Paul Turner Date: Sat, 22 Jan 2011 04:45:00 +0000 (-0800) Subject: sched: Fix/remove redundant cfs_rq checks X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b815f1963e47b9b69bb17e0588bd5af5b1114ae0;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git sched: Fix/remove redundant cfs_rq checks Since updates are against an entity's queuing cfs_rq it's not possible to enter update_cfs_{shares,load} with a NULL cfs_rq. (Indeed, update_cfs_load would crash prior to the check if we did anyway since we load is examined during the initializers). Also, in the update_cfs_load case there's no point in maintaining averages for rq->cfs_rq since we don't perform shares distribution at that level -- NULL check is replaced accordingly. Thanks to Dan Carpenter for pointing out the deference before NULL check. Signed-off-by: Paul Turner Signed-off-by: Peter Zijlstra LKML-Reference: <20110122044851.825284940@google.com> Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index ccecfec02a70..1997383ba4d6 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -722,7 +722,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update) u64 now, delta; unsigned long load = cfs_rq->load.weight; - if (!cfs_rq) + if (cfs_rq->tg == &root_task_group) return; now = rq_of(cfs_rq)->clock; @@ -830,9 +830,6 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta) struct sched_entity *se; long shares; - if (!cfs_rq) - return; - tg = cfs_rq->tg; se = tg->se[cpu_of(rq_of(cfs_rq))]; if (!se)