sched: Stuff the sched_domain creation in a data-structure

In order to make the topology contruction fully dynamic, remove the
still hard-coded list of possible domains and stick them in a
data-structure.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110407122942.770335383@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 26 insertions, 6 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 3ae1e023f3f0..f0e1821dcb96 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6843,6 +6843,16 @@ enum s_alloc {
         sa_none,
 };
 
+typedef struct sched_domain *(*sched_domain_build_f)(struct s_data *d,
+                const struct cpumask *cpu_map, struct sched_domain_attr *attr,
+                struct sched_domain *parent, int cpu);
+
+typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
+
+struct sched_domain_topology_level {
+        sched_domain_build_f build;
+};
+
 /*
  * Assumes the sched_domain tree is fully constructed
  */
@@ -7185,6 +7195,18 @@ static struct sched_domain *__build_smt_sched_domain(struct s_data *d,
         return sd;
 }
 
+static struct sched_domain_topology_level default_topology[] = {
+        { __build_allnodes_sched_domain, },
+        { __build_node_sched_domain, },
+        { __build_cpu_sched_domain, },
+        { __build_book_sched_domain, },
+        { __build_mc_sched_domain, },
+        { __build_smt_sched_domain, },
+        { NULL, },
+};
+
+static struct sched_domain_topology_level *sched_domain_topology = default_topology;
+
 /*
  * Build sched domains for a given set of cpus and attach the sched domains
  * to the individual cpus
@@ -7203,13 +7225,11 @@ static int build_sched_domains(const struct cpumask *cpu_map,
 
         /* Set up domains for cpus specified by the cpu_map. */
         for_each_cpu(i, cpu_map) {
+                struct sched_domain_topology_level *tl;
+
                 sd = NULL;
-                sd = __build_allnodes_sched_domain(&d, cpu_map, attr, sd, i);
-                sd = __build_node_sched_domain(&d, cpu_map, attr, sd, i);
-                sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i);
-                sd = __build_book_sched_domain(&d, cpu_map, attr, sd, i);
-                sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
-                sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);
+                for (tl = sched_domain_topology; tl->build; tl++)
+                        sd = tl->build(&d, cpu_map, attr, sd, i);
 
                 *per_cpu_ptr(d.sd, i) = sd;
         }