From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36AB072631; Sun, 1 Mar 2026 01:28:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772328485; cv=none; b=Tfq42jBjns3XuQB1HYxDtaOQ4LOOzUG1iDL0+xZpTpL4w8qhtoME7aKoArhbcXKhpzeBBGMW54F+F1wS4WwVSFFzwIlZVChIDPh4sXHVE8rOchOLkOX/d8j1YhF60e96TnLBE6bs3XZ2fBgdBZzLnijHzmFdV8EPonpB94PiWj8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772328485; c=relaxed/simple; bh=WTOUF83UYU2jVYOgULKxRPuaJ8uBlQIoaUgFlqkIA0o=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=TE+0vLe84dwUiww9fFaHfMBWsKwxZmA7K0eTOsy0kevCnbZKOeuLUKTdEwPt+nGhzLMei2jUVsQYs3lEUBk/rEp7isdzMoCquEgrA1foTaQy5OYyKHbkZidoC/XXA+dwrL478JOoQ/qo0ZJEAf97Tyh6q/Bjoc21gzCWCTAdYlc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hIvz4n48; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hIvz4n48" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85439C19421; Sun, 1 Mar 2026 01:28:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772328485; bh=WTOUF83UYU2jVYOgULKxRPuaJ8uBlQIoaUgFlqkIA0o=; h=From:To:Cc:Subject:Date:From; b=hIvz4n48NCDP9J1Sp+BrvN0T4Kf9p9g6kMNxjtPeU5jSMZAQDOqVEU9bvGLu+jRDt DofBbKhI7Ifx7dd324BBxi8ncWEjd16OBXgqEowIxpyY7rykxO9TzTUnA15pECfK9h Wk0Mqb1CjS+L2Y8cIxQBsCvcPMEwtT6XjVm+5k8bWM9RQuurCg8ULdLF0WacSIA6eA TY3BfA3dX5g2dXVgHsj7IpT4yD+DjfkD/T9+KZTo1EhgJ1y/4YIoXlKY3d1B/QsT3x L56ZQYoR60LzWATsoIN0OCZML7EMOlkbD+ovmTYpHycCp+LX40hvkMiNlvu3L+fHcW vKhB2/ct5lHdA== From: Sasha Levin To: stable@vger.kernel.org, mhiramat@kernel.org Cc: Mathieu Desnoyers , "Steven Rostedt (Google)" , linux-trace-kernel@vger.kernel.org Subject: FAILED: Patch "tracing: Fix to set write permission to per-cpu buffer_size_kb" failed to apply to 6.12-stable tree Date: Sat, 28 Feb 2026 20:28:02 -0500 Message-ID: <20260301012803.1685713-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit 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 . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From f844282deed7481cf2f813933229261e27306551 Mon Sep 17 00:00:00 2001 From: "Masami Hiramatsu (Google)" 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: stable@vger.kernel.org Cc: Mathieu Desnoyers Link: https://patch.msgid.link/177071301597.2293046.11683339475076917920.stgit@mhiramat.tok.corp.google.com Fixes: 21ccc9cd7211 ("tracing: Disable "other" permission bits in the tracefs files") Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- 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