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 90EA835B65E; Thu, 12 Feb 2026 14:14:51 +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=1770905691; cv=none; b=WflAsCslXjEe6GQz8rQ+tTm23sGvPCUg4ym3XL8xJoBDPzum2lYvukPHjyZkeEbXPu9deyrX41zhT4uJvKyYk+FzF5z2NlhoqbllcFKloOEn1S3dz0lKyGyhYW7iTFr1Lm5dNqkGZeTf8tT33MEHMU2V7VEkd4k8205HjA7JYss= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770905691; c=relaxed/simple; bh=5iN4Au8UeMri4/4aTlWwZL5atQwbRH8ebxaQUHqwz2s=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=K6QkPCH71eFlJvi57SjkTX6NmAq168amWQixxPJ18dt/5xoy3w2B4LH6E1jUwrr+sEAN75J0mxBholO1J+gIjt0eaig+iZ3Yzm12D4ZRObXvDbgceKmdcUijoMforUWgJ4+zss+ocT5Hb4eT9gYLjhWNNuBc5gmK6GoQ2voxMSw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qD++ga1E; 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="qD++ga1E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F1A3C19425; Thu, 12 Feb 2026 14:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770905691; bh=5iN4Au8UeMri4/4aTlWwZL5atQwbRH8ebxaQUHqwz2s=; h=Date:From:To:Cc:Subject:References:From; b=qD++ga1EipNku49K9KDr4FwpMMGbM/xHHR98ZELglWNTXuOT/WecTQeGk6/H5BI5U Y0ZKPNWk8X1oH/sYfomyZNBbdId643Ce86MAkJYdQn9fXNQHMo7GKhUQYM4PZN7yqV qpRqCOuvr01xHgWXZ35EK0njz4r58qDEH74S3BiNwuhJvxKQSF+4uoNiu3Y2Kacyv6 97q46v+9M/h/vad5SGTcTv1XT7y2VhdvAsBn/OUbCWNAunpX5k043hJE/ubeUQLg7B DxpS+e7T74rLHcNCTone/XlxYwZXOr/6aBmfqxNwaFF+B4t+9MTuI6Jk7nMQp5Ch0C 704QwXX0xNKOA== Received: from rostedt by gandalf with local (Exim 4.99.1) (envelope-from ) id 1vqXT0-000000002mM-2XMg; Thu, 12 Feb 2026 09:14:50 -0500 Message-ID: <20260212141450.462148762@kernel.org> User-Agent: quilt/0.69 Date: Thu, 12 Feb 2026 09:14:35 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , stable@vger.kernel.org Subject: [for-next][PATCH 2/3] tracing: Reset last_boot_info if ring buffer is reset References: <20260212141433.849771751@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 From: "Masami Hiramatsu (Google)" Commit 32dc0042528d ("tracing: Reset last-boot buffers when reading out all cpu buffers") resets the last_boot_info when user read out all data via trace_pipe* files. But it is not reset when user resets the buffer from other files. (e.g. write `trace` file) Reset it when the corresponding ring buffer is reset too. Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers Link: https://patch.msgid.link/177071302364.2293046.17895165659153977720.stgit@mhiramat.tok.corp.google.com Fixes: 32dc0042528d ("tracing: Reset last-boot buffers when reading out all cpu buffers") Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fd470675809b..e884d32b7895 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4127,6 +4127,8 @@ static int tracing_single_release_tr(struct inode *inode, struct file *file) return single_release(inode, file); } +static bool update_last_data_if_empty(struct trace_array *tr); + static int tracing_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; @@ -4151,6 +4153,8 @@ static int tracing_open(struct inode *inode, struct file *file) tracing_reset_online_cpus(trace_buf); else tracing_reset_cpu(trace_buf, cpu); + + update_last_data_if_empty(tr); } if (file->f_mode & FMODE_READ) { @@ -5215,6 +5219,7 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf, int tracer_init(struct tracer *t, struct trace_array *tr) { tracing_reset_online_cpus(&tr->array_buffer); + update_last_data_if_empty(tr); return t->init(tr); } @@ -7028,6 +7033,7 @@ int tracing_set_clock(struct trace_array *tr, const char *clockstr) ring_buffer_set_clock(tr->snapshot_buffer.buffer, trace_clocks[i].func); tracing_reset_online_cpus(&tr->snapshot_buffer); #endif + update_last_data_if_empty(tr); if (tr->scratch && !(tr->flags & TRACE_ARRAY_FL_LAST_BOOT)) { struct trace_scratch *tscratch = tr->scratch; -- 2.51.0