From 65c5e253168dbbb52c20026b0c5b7a2f344b9197 Mon Sep 17 00:00:00 2001 From: Valentin Schneider Date: Mon, 17 Aug 2020 12:29:51 +0100 Subject: [PATCH] sched/topology: Verify SD_* flags setup when sched_debug is on Now that we have some description of what we expect the flags layout to be, we can use that to assert at runtime that the actual layout is sane. Signed-off-by: Valentin Schneider Signed-off-by: Ingo Molnar Reviewed-by: Dietmar Eggemann Acked-by: Peter Zijlstra Link: https://lore.kernel.org/r/20200817113003.20802-6-valentin.schneider@arm.com --- kernel/sched/topology.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index fe03969..cbdaf08 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -29,6 +29,8 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level, struct cpumask *groupmask) { struct sched_group *group = sd->groups; + unsigned long flags = sd->flags; + unsigned int idx; cpumask_clear(groupmask); @@ -43,6 +45,21 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level, printk(KERN_ERR "ERROR: domain->groups does not contain CPU%d\n", cpu); } + for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { + unsigned int flag = BIT(idx); + unsigned int meta_flags = sd_flag_debug[idx].meta_flags; + + if ((meta_flags & SDF_SHARED_CHILD) && sd->child && + !(sd->child->flags & flag)) + printk(KERN_ERR "ERROR: flag %s set here but not in child\n", + sd_flag_debug[idx].name); + + if ((meta_flags & SDF_SHARED_PARENT) && sd->parent && + !(sd->parent->flags & flag)) + printk(KERN_ERR "ERROR: flag %s set here but not in parent\n", + sd_flag_debug[idx].name); + } + printk(KERN_DEBUG "%*s groups:", level + 1, ""); do { if (!group) { -- 2.7.4