The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From f844282deed7481cf2f813933229261e27306551 Mon Sep 17 00:00:00 2001 From: "Masami Hiramatsu (Google)" <[email protected]> Date: Tue, 10 Feb 2026 17:43:36 +0900 Subject: [PATCH] tracing: Fix to set write permission to per-cpu buffer_size_kb Since the per-cpu buffer_size_kb file is writable for changing per-cpu ring buffer size, the file should have the write access permission. Cc: [email protected] Cc: Mathieu Desnoyers <[email protected]> Link: https://patch.msgid.link/177071301597.2293046.11683339475076917920.st...@mhiramat.tok.corp.google.com Fixes: 21ccc9cd7211 ("tracing: Disable "other" permission bits in the tracefs files") Signed-off-by: Masami Hiramatsu (Google) <[email protected]> Signed-off-by: Steven Rostedt (Google) <[email protected]> --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 845b8a165daf3..fd470675809b3 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -8613,7 +8613,7 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu, tr, cpu, &tracing_stats_fops); - trace_create_cpu_file("buffer_size_kb", TRACE_MODE_READ, d_cpu, + trace_create_cpu_file("buffer_size_kb", TRACE_MODE_WRITE, d_cpu, tr, cpu, &tracing_entries_fops); if (tr->range_addr_start) -- 2.51.0
