sched, block: Unify cache detection

The block layer has some code trying to determine if two CPUs share a
cache, the scheduler has a similar function. Expose the function used
by the scheduler and make the block layer use it, thereby removing the
block layers usage of CONFIG_SCHED* and topology bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jens Axboe <axboe@kernel.dk>
Link: http://lkml.kernel.org/r/1327579450.2446.95.camel@twins

1 files changed, 0 insertions, 16 deletions

diff --git a/block/blk.h b/block/blk.h
index 7efd772336de..df5b59acbdff 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -164,22 +164,6 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
         return q->nr_congestion_off;
 }
 
-static inline int blk_cpu_to_group(int cpu)
-{
-        int group = NR_CPUS;
-#ifdef CONFIG_SCHED_MC
-        const struct cpumask *mask = cpu_coregroup_mask(cpu);
-        group = cpumask_first(mask);
-#elif defined(CONFIG_SCHED_SMT)
-        group = cpumask_first(topology_thread_cpumask(cpu));
-#else
-        return cpu;
-#endif
-        if (likely(group < NR_CPUS))
-                return group;
-        return cpu;
-}
-
 /*
  * Contribute to IO statistics IFF:
  *