Commit 7c727dfce6be for kernel

commit 7c727dfce6be04dd009b29091a4a17d952dbfe03
Author: Vincent Donnefort <vdonnefort@google.com>
Date:   Thu Aug 6 22:13:01 2026 +0100

    ring-buffer: Prevent resizing of persistent ring buffer

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

    Cc: stable@vger.kernel.org
    Fixes: be68d63a139b ("ring-buffer: Add ring_buffer_alloc_range()")
    Link: https://patch.msgid.link/20260806211306.3704194-2-vdonnefort@google.com
    Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 58dc8995a88d..09d502ef4c55 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);