[for-next][PATCH 2/9] ring-buffer: Free cpu_buffer::free_page with subbuf_order

[Steven Rostedt]

From: Vincent Donnefort <vdonnefort@xxxxxxxxxx>

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.

Cc: stable@xxxxxxxxxxxxxxx
Link: https://patch.msgid.link/20260813131152.3589632-2-vdonnefort@xxxxxxxxxx
Fixes: f9b94daa542a ("ring-buffer: Set new size of the ring buffer sub page")
Reported-by: Sashiko <sashiko-bot@xxxxxxxxxx>
Signed-off-by: Vincent Donnefort <vdonnefort@xxxxxxxxxx>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 kernel/trace/ring_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 8f34ff6fd066..73a3fb76ba4d 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2631,7 +2631,7 @@ 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);
 }
-- 
2.53.0