[PATCH v2 3/3] ring-buffer: Allow sparse CPU masks in ring_buffer_desc()
From: Vincent Donnefort <hidden>
Date: 2026-07-09 16:00:48
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
No user currently relies on sparse CPU masks, but the descriptor logic already
supports them via linear fallback. Remove the arbitrary limitation.
Fixes: 2e67fabd8b77 ("ring-buffer: Introduce ring-buffer remotes")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <redacted>
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 56a328e94395..4e7b4ce7b8a7 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c@@ -2329,10 +2329,7 @@ static struct ring_buffer_desc *ring_buffer_desc(struct trace_buffer_desc *trace size_t len; int i; - if (!trace_desc) - return NULL; - - if (cpu >= trace_desc->nr_cpus) + if (!trace_desc || !trace_desc->nr_cpus) return NULL; end = (struct ring_buffer_desc *)((void *)trace_desc + trace_desc->struct_len);
--
2.55.0.795.g602f6c329a-goog