From: Vincent Donnefort Date: Thu, 6 Aug 2026 21:13:01 +0000 (+0100) Subject: ring-buffer: Prevent resizing of persistent ring buffer X-Git-Tag: v7.2-rc7~1^2~3 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7c727dfce6be04dd009b29091a4a17d952dbfe03;p=thirdparty%2Flinux.git 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 Signed-off-by: Steven Rostedt --- 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);