ring-buffer: Remove jump to out label in ring_buffer_swap_cpu()

The function ring_buffer_swap_cpu() has a bunch of jumps to the label out
that simply returns "ret". There's no reason to jump to a label that
simply returns a value. Just return directly from there.

This goes back to almost the beginning when commit 8aabee573dff
("ring-buffer: remove unneeded get_online_cpus") was introduced. That
commit removed a put_online_cpus() from that label, but never updated all
the jumps to it that now no longer needed to do anything but return a
value.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250527145753.6b45d840@gandalf.local.home
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index a01fc42f2a13b5d8851628cbd0ad6a9fd3c77892..c912ce4c8c89aca41ab31c05dd4ed2cd9f5a284b 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -6315,37 +6315,33 @@ int ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
 
        if (!cpumask_test_cpu(cpu, buffer_a->cpumask) ||
            !cpumask_test_cpu(cpu, buffer_b->cpumask))
-               goto out;
+               return -EINVAL;
 
        cpu_buffer_a = buffer_a->buffers[cpu];
        cpu_buffer_b = buffer_b->buffers[cpu];
 
        /* It's up to the callers to not try to swap mapped buffers */
-       if (WARN_ON_ONCE(cpu_buffer_a->mapped || cpu_buffer_b->mapped)) {
-               ret = -EBUSY;
-               goto out;
-       }
+       if (WARN_ON_ONCE(cpu_buffer_a->mapped || cpu_buffer_b->mapped))
+               return -EBUSY;
 
        /* At least make sure the two buffers are somewhat the same */
        if (cpu_buffer_a->nr_pages != cpu_buffer_b->nr_pages)
-               goto out;
+               return -EINVAL;
 
        if (buffer_a->subbuf_order != buffer_b->subbuf_order)
-               goto out;
-
-       ret = -EAGAIN;
+               return -EINVAL;
 
        if (atomic_read(&buffer_a->record_disabled))
-               goto out;
+               return -EAGAIN;
 
        if (atomic_read(&buffer_b->record_disabled))
-               goto out;
+               return -EAGAIN;
 
        if (atomic_read(&cpu_buffer_a->record_disabled))
-               goto out;
+               return -EAGAIN;
 
        if (atomic_read(&cpu_buffer_b->record_disabled))
-               goto out;
+               return -EAGAIN;
 
        /*
         * We can't do a synchronize_rcu here because this
@@ -6382,7 +6378,6 @@ int ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
 out_dec:
        atomic_dec(&cpu_buffer_a->record_disabled);
        atomic_dec(&cpu_buffer_b->record_disabled);
-out:
        return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);