From nobody Tue Feb 10 06:08:01 2026 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 808FF125B2; Wed, 28 Jan 2026 00:09:51 +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=1769558991; cv=none; b=gFKwqYtIGCqwnFyqJULLYBLL38eD1fHyRHPSqkmof4rvQl6pm/zimaAtEBcRSHBNIo81sXZGr9imzLAEfYENFeVoSoPUOqW6vojT+fRmoSTYpF3Q7RlB/68O+/Ef7fg6KZ5RxcijZOaCluuRaYlAoUxaC5PLi9vF0+0XH8WAH4U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769558991; c=relaxed/simple; bh=YQL7l01WmvmK7If7bIbiNydjrUoMH+8UyFa2Eop9bCU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Q3TX6XOcu+ke6MomqZBM3lt1BcdCBPPhzSqLf3lEPh2ElqFfhWtWh71lg0zM2brB1oeM/x+iqcaAWQyeXNlmerVQNWtVPYhT3786y22WcGg2znJbH/OvKvvMFFxKdoskymdjz1T+PCGdgAmTDMDed/YhkQft70SHf2786rQQhqU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tin/Aphc; 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="tin/Aphc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60C2FC116C6; Wed, 28 Jan 2026 00:09:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769558991; bh=YQL7l01WmvmK7If7bIbiNydjrUoMH+8UyFa2Eop9bCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tin/AphcIAZJu10ZgsmeMDWfmjiHW6uDdOiPv7qgSiFkNRWzUI+CFUNxNo/5mceh2 PINIw1mcmOFS5TigHz/l/plSxEWtHtMtgl+Ek6/9XV9NV6dKWO0DtU4kY0upZZJlwZ xmGAWJC8kl0bhyYKs8JhS0EjCUCgeYgCSfUgFTR5CAe5G8snhZXI5dA/oIokvUk8u7 ePwmlzsFMj/5u8e2rd8TnWFcyJtNVNJdHA52+tc6XVWF5nuTFq5nDNzy8uVxeTUHZk 1hMSvO+JiUuswIqYKZkYLCA6qhE2OR8me5XLtL75X/lCcKGnKjTkpNmgS4W74WJsjr sFy3OfXFKbcBA== From: "Masami Hiramatsu (Google)" To: Steven Rostedt Cc: Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 1/4] tracing: Reset last_boot_info if ring buffer is reset Date: Wed, 28 Jan 2026 09:09:48 +0900 Message-ID: <176955898871.2786091.11770303255491867688.stgit@mhiramat.tok.corp.google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog In-Reply-To: <176955897718.2786091.11948759407196200082.stgit@mhiramat.tok.corp.google.com> References: <176955897718.2786091.11948759407196200082.stgit@mhiramat.tok.corp.google.com> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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. Fixes: 32dc0042528d ("tracing: Reset last-boot buffers when reading out all= cpu buffers") Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 396d59202438..5c3e4a554143 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4891,6 +4891,8 @@ static int tracing_single_release_tr(struct inode *in= ode, struct file *file) return single_release(inode, file); } =20 +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 =3D inode->i_private; @@ -4915,6 +4917,8 @@ static int tracing_open(struct inode *inode, struct f= ile *file) tracing_reset_online_cpus(trace_buf); else tracing_reset_cpu(trace_buf, cpu); + + update_last_data_if_empty(tr); } =20 if (file->f_mode & FMODE_READ) { @@ -5981,6 +5985,7 @@ 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); } =20 @@ -7799,6 +7804,7 @@ int tracing_set_clock(struct trace_array *tr, const c= har *clockstr) ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); tracing_reset_online_cpus(&tr->max_buffer); #endif + update_last_data_if_empty(tr); =20 if (tr->scratch && !(tr->flags & TRACE_ARRAY_FL_LAST_BOOT)) { struct trace_scratch *tscratch =3D tr->scratch; @@ -8036,6 +8042,7 @@ tracing_snapshot_write(struct file *filp, const char = __user *ubuf, size_t cnt, tracing_reset_online_cpus(&tr->max_buffer); else tracing_reset_cpu(&tr->max_buffer, iter->cpu_file); + update_last_data_if_empty(tr); } break; }