[PATCH 3/6] ring-buffer: Free cpu_buffer->free_page with subbuf_order

When sub-buffers use an order greater than 0, cpu_buffer->free_page is
allocated with subbuf_order. Use the correct order for
cpu_buffer->free_page.

Fixes: f9b94daa542a ("ring-buffer: Set new size of the ring buffer sub page")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <redacted>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 026658c70351..ac5f5d9502dd 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c

@@ -2654,7 +2654,7 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
 		free_buffer_page(bpage);
 	}
 
-	free_page((unsigned long)cpu_buffer->free_page);
+	free_pages((unsigned long)cpu_buffer->free_page, cpu_buffer->buffer->subbuf_order);
 
 	kfree(cpu_buffer);
 }

-- 
2.55.0.654.g21b8a5bc05-goog