[for-linus][PATCH 09/12] ring-buffer: Prevent resizing of persistent ring buffer
Steven Rostedt <[email protected]>
| Newsgroups | org.kernel.vger.stable,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
From: Vincent Donnefort <[email protected]> Dynamically resizing a persistent ring buffer is not possible. Disable the feature. Cc: [email protected] Fixes: be68d63a139b ("ring-buffer: Add ring_buffer_alloc_range()") Link: https://patch.msgid.link/[email protected] Signed-off-by: Vincent Donnefort <[email protected]> Signed-off-by: Steven Rostedt <[email protected]> --- kernel/trace/ring_buffer.c | 2 ++ 1 file changed, 2 insertions(+) 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); -- 2.53.0