From nobody Sun Feb 8 21:28:13 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 51F5812F366 for ; Mon, 26 Feb 2024 18:47:51 +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=1708973271; cv=none; b=CntxigCjstfrleyTmRQ+4l0m6V7eMxvOTLXC8FqYElq15qK5oJ8iuwClY2FCO5Jb6ouxi/ZEl8OXNzdUY7CGIMflWIBOmBqdIGjaw5eFm038ZkSETSZqqCV6R3Oyg/rMU8AQqKpmBS1DQvsGPFji/haCTk/zgEdMoBfyCiWy8x8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708973271; c=relaxed/simple; bh=HhCGbYUvJpsjVhZrwqg9MzrWJrNfc26aXG/vEKAtQdY=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=UgKO3uSo6fOVmK9NpkRbl0sl2jd8jCl8WPSDlLEJi3uao6Y2wnOdhniYtUg4x+NXQsMM+GkfFIqQmajCjx4sYMImSjdfXov5t700U+tEcAXXytBqD2RADHfxZc1efhK50IQQAZpSEkTsn7zOm2FDIe6+iAFwO+yvkHVwK3qVp+w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB1F1C43394; Mon, 26 Feb 2024 18:47:50 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.97) (envelope-from ) id 1reg2x-000000090aR-1AML; Mon, 26 Feb 2024 13:49:51 -0500 Message-ID: <20240226184951.137652037@goodmis.org> User-Agent: quilt/0.67 Date: Mon, 26 Feb 2024 13:49:35 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton Subject: [for-next][PATCH 3/5] tracing: Add __string_len() example References: <20240226184932.303400070@goodmis.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: "Steven Rostedt (Google)" There's no example code that uses __string_len(), and since the sample code is used for testing the event logic, add a use case. Link: https://lore.kernel.org/linux-trace-kernel/20240223152827.5f9f78e2@ga= ndalf.local.home Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Signed-off-by: Steven Rostedt (Google) --- samples/trace_events/trace-events-sample.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_eve= nts/trace-events-sample.h index f2d2d56ce8e2..2dfaf7fc7bfa 100644 --- a/samples/trace_events/trace-events-sample.h +++ b/samples/trace_events/trace-events-sample.h @@ -303,6 +303,7 @@ TRACE_EVENT(foo_bar, __bitmask( cpus, num_possible_cpus() ) __cpumask( cpum ) __vstring( vstr, fmt, va ) + __string_len( lstr, foo, bar / 2 < strlen(foo) ? bar / 2 : strlen(foo) ) ), =20 TP_fast_assign( @@ -311,12 +312,13 @@ TRACE_EVENT(foo_bar, memcpy(__get_dynamic_array(list), lst, __length_of(lst) * sizeof(int)); __assign_str(str, string); + __assign_str(lstr, foo); __assign_vstr(vstr, fmt, va); __assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus()); __assign_cpumask(cpum, cpumask_bits(mask)); ), =20 - TP_printk("foo %s %d %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->ba= r, + TP_printk("foo %s %d %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry-= >bar, =20 /* * Notice here the use of some helper functions. This includes: @@ -360,7 +362,8 @@ TRACE_EVENT(foo_bar, __print_array(__get_dynamic_array(list), __get_dynamic_array_len(list) / sizeof(int), sizeof(int)), - __get_str(str), __get_bitmask(cpus), __get_cpumask(cpum), + __get_str(str), __get_str(lstr), + __get_bitmask(cpus), __get_cpumask(cpum), __get_str(vstr)) ); =20 --=20 2.43.0