Instead of relying on knowing the build order and various CONFIG_ flags simply remember the bottom most sched_domain when we created the domain hierarchy. Signed-off-by: Peter Zijlstra --- include/asm-generic/percpu.h | 4 ++++ kernel/sched.c | 23 +++++++++++++---------- 2 files changed, 17 insertions(+), 10 deletions(-) Index: linux-2.6/kernel/sched.c =================================================================== --- linux-2.6.orig/kernel/sched.c +++ linux-2.6/kernel/sched.c @@ -6841,11 +6841,13 @@ struct s_data { cpumask_var_t nodemask; cpumask_var_t send_covered; cpumask_var_t tmpmask; + struct sched_domain ** __percpu sd; struct root_domain *rd; }; enum s_alloc { sa_rootdomain, + sa_sd, sa_tmpmask, sa_send_covered, sa_nodemask, @@ -7080,6 +7082,8 @@ static void __free_domain_allocs(struct switch (what) { case sa_rootdomain: free_rootdomain(d->rd); /* fall through */ + case sa_sd: + free_percpu(d->sd); /* fall through */ case sa_tmpmask: free_cpumask_var(d->tmpmask); /* fall through */ case sa_send_covered: @@ -7100,10 +7104,15 @@ static enum s_alloc __visit_domain_alloc return sa_nodemask; if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL)) return sa_send_covered; + d->sd = alloc_percpu(struct sched_domain *); + if (!d->sd) { + printk(KERN_WARNING "Cannot alloc per-cpu pointers\n"); + return sa_tmpmask; + } d->rd = alloc_rootdomain(); if (!d->rd) { printk(KERN_WARNING "Cannot alloc root domain\n"); - return sa_tmpmask; + return sa_sd; } return sa_rootdomain; } @@ -7292,6 +7301,8 @@ static int __build_sched_domains(const s sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i); sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i); + *per_cpu_ptr(d.sd, i) = sd; + for (tmp = sd; tmp; tmp = tmp->parent) { tmp->span_weight = cpumask_weight(sched_domain_span(tmp)); build_sched_groups(&d, tmp, cpu_map, i); @@ -7339,15 +7350,7 @@ static int __build_sched_domains(const s /* Attach the domains */ for_each_cpu(i, cpu_map) { -#ifdef CONFIG_SCHED_SMT - sd = &per_cpu(cpu_domains, i).sd; -#elif defined(CONFIG_SCHED_MC) - sd = &per_cpu(core_domains, i).sd; -#elif defined(CONFIG_SCHED_BOOK) - sd = &per_cpu(book_domains, i).sd; -#else - sd = &per_cpu(phys_domains, i).sd; -#endif + sd = *per_cpu_ptr(d.sd, i); cpu_attach_domain(sd, d.rd, i); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/