[PATCH 1/6] ring-buffer: Prevent resizing of persistent ring buffer

Dynamically resizing a persistent ring buffer is not possible. Disable
the feature.

Fixes: be68d63a139b ("ring-buffer: Add ring_buffer_alloc_range()")
Signed-off-by: Vincent Donnefort <[email protected]>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 8e2485bb3aa8..afe75ad2bbf2 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2528,6 +2528,8 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu)
 		if (cpu_buffer->ring_meta->head_buffer)
 			rb_meta_buffer_update(cpu_buffer, bpage);
 		bpage->range = 1;
+
+		atomic_inc(&cpu_buffer->resize_disabled);
 	} else if (buffer->remote) {
 		struct ring_buffer_desc *desc = ring_buffer_desc(buffer->remote->desc, cpu);
 
-- 
2.55.0.654.g21b8a5bc05-goog