blk-mq: remove raise_blk_irq

By open coding raise_blk_irq in the only caller, and replacing the
ifdef CONFIG_SMP with an IS_ENABLED check the flow in the caller
can be significantly simplified.

Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index a261e14..ada5552 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -613,37 +613,11 @@ static void blk_mq_trigger_softirq(struct request *rq)
                raise_softirq_irqoff(BLOCK_SOFTIRQ);
 }
 
-#ifdef CONFIG_SMP
 static void trigger_softirq(void *data)
 {
        blk_mq_trigger_softirq(data);
 }
 
-/*
- * Setup and invoke a run of 'trigger_softirq' on the given cpu.
- */
-static int raise_blk_irq(int cpu, struct request *rq)
-{
-       if (cpu_online(cpu)) {
-               call_single_data_t *data = &rq->csd;
-
-               data->func = trigger_softirq;
-               data->info = rq;
-               data->flags = 0;
-
-               smp_call_function_single_async(cpu, data);
-               return 0;
-       }
-
-       return 1;
-}
-#else /* CONFIG_SMP */
-static int raise_blk_irq(int cpu, struct request *rq)
-{
-       return 1;
-}
-#endif
-
 static int blk_softirq_cpu_dead(unsigned int cpu)
 {
        /*
@@ -688,11 +662,17 @@ static void __blk_complete_request(struct request *req)
         * support multiple interrupts, so current CPU is unique actually. This
         * avoids IPI sending from current CPU to the first CPU of a group.
         */
-       if (ccpu == cpu || shared) {
-do_local:
+       if (IS_ENABLED(CONFIG_SMP) &&
+           ccpu != cpu && !shared && cpu_online(ccpu)) {
+               call_single_data_t *data = &req->csd;
+
+               data->func = trigger_softirq;
+               data->info = req;
+               data->flags = 0;
+               smp_call_function_single_async(cpu, data);
+       } else {
                blk_mq_trigger_softirq(req);
-       } else if (raise_blk_irq(ccpu, req))
-               goto do_local;
+       }
 
        local_irq_restore(flags);
 }