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ring-buffer: Prevent resizing of persistent ring buffer

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

Cc: stable@vger.kernel.org
Fixes: be68d63a13 ("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>
This commit is contained in:
Vincent Donnefort
2026-08-06 22:13:01 +01:00
committed by Steven Rostedt
parent 8b8292d648
commit 7c727dfce6
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/ring_buffer.c
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@@ -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);