From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (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 9B46632ABF3; Mon, 10 Nov 2025 18:47:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762800463; cv=none; b=cv/X61rtrwX4bJMoRYbzIYM5xbEk2Ni6bU7djq7uwk13dnlwzicM4oPv1kMywWFP04BoT1f2+3xZ4iBstm+XxEgM9YKgUkPLSETZu/oLCMjxQQHWRS06zG3ayd1SXQTwCbj4ZCNrRUrQMksW6Lz/N9U9oT7ECJ7PqxwPBB0h+Wc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762800463; c=relaxed/simple; bh=Kew62E3E6IXuZlcG7gu+P9XzNY1zD9FK9bnTsI2boF4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z3rnQh80RZVm4zNYW2Xn+MhwIK1/9hxf5yDkTQVdLDeXaXcIGshfME7XEqqmqkKEjGt8uy4TZ1txF8RC6WMjZNby88SepW/Ct4JB7Ycz1yFgG87PKds0VzUYWoJvEf/zBIeB4l3VyiyL0rn4iMAN0BjDUhPtLJT6EVHT34+7P1U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Enyucwxt; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Enyucwxt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1762800462; x=1794336462; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Kew62E3E6IXuZlcG7gu+P9XzNY1zD9FK9bnTsI2boF4=; b=EnyucwxtjCWLRvGTqAdWjOEIUhGfAleQyXJLmPea1E56AE1ofTo8aPvY MTqkWxVXuC6tRlLTFiAzNs1bPsMQxlMA9KMtKB7x3DqSNhFeF4g18aqak 2m6Qiwri7Ck0rAd3J6gUbP24WvM04tmw5zxsl8ag/DDN04RbNNG0KfsHi lg2RDy9UP9saWa87UX/6ILAMOW5A9FHIUAvx6S5d7gatBwcpfophLT0bz ZiO3YS46G5bOGsEMlTmLfyp9q/3tS4xin9uUtA6S6SV6zXc7tPye2nAli sO/FY4QdoynJ3Zr8oFjd0/2GRtImLpbKiZ6+1ZzDEF2eqBt8GMZCrGJsi A==; X-CSE-ConnectionGUID: AYMt4uHVTLyFHKHjsgRbUQ== X-CSE-MsgGUID: 99+SC2UgR/uWeem9WjrHqg== X-IronPort-AV: E=McAfee;i="6800,10657,11531"; a="64769605" X-IronPort-AV: E=Sophos;i="6.17,312,1747724400"; d="scan'208";a="64769605" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2025 10:47:38 -0800 X-CSE-ConnectionGUID: tjBTfSXPSK+R85GBxnBx7Q== X-CSE-MsgGUID: icFeQ/OWQnuNNObR45nQtA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,294,1754982000"; d="scan'208";a="193749559" Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa004.fm.intel.com with ESMTP; 10 Nov 2025 10:47:29 -0800 Received: by black.igk.intel.com (Postfix, from userid 1003) id EEA2B96; Mon, 10 Nov 2025 19:47:28 +0100 (CET) From: Andy Shevchenko To: Corey Minyard , =?UTF-8?q?Christian=20K=C3=B6nig?= , "Dr. David Alan Gilbert" , Alex Deucher , Thomas Zimmermann , Dmitry Baryshkov , Rob Clark , Matthew Brost , Hans Verkuil , Laurent Pinchart , Ulf Hansson , Andy Shevchenko , Vitaly Lifshits , Manivannan Sadhasivam , Niklas Cassel , Calvin Owens , Sagi Maimon , "Martin K. Petersen" , Karan Tilak Kumar , Casey Schaufler , Steven Rostedt , Petr Mladek , Max Kellermann , Takashi Iwai , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, openipmi-developer@lists.sourceforge.net, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, amd-gfx@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-mmc@vger.kernel.org, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-pci@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-staging@lists.linux.dev, ceph-devel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-sound@vger.kernel.org Cc: Rasmus Villemoes , Sergey Senozhatsky , Jonathan Corbet , Sumit Semwal , Gustavo Padovan , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Konrad Dybcio , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Rodrigo Vivi , Mauro Carvalho Chehab , Vladimir Oltean , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Tony Nguyen , Przemek Kitszel , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Rodolfo Giometti , Jonathan Lemon , Vadim Fedorenko , Richard Cochran , Stefan Haberland , Jan Hoeppner , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Satish Kharat , Sesidhar Baddela , "James E.J. Bottomley" , Greg Kroah-Hartman , Xiubo Li , Ilya Dryomov , Masami Hiramatsu , Mathieu Desnoyers , Andrew Morton , Jaroslav Kysela , Takashi Iwai Subject: [PATCH v1 01/23] lib/vsprintf: Add specifier for printing struct timespec64 Date: Mon, 10 Nov 2025 19:40:20 +0100 Message-ID: <20251110184727.666591-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251110184727.666591-1-andriy.shevchenko@linux.intel.com> References: <20251110184727.666591-1-andriy.shevchenko@linux.intel.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A handful drivers want to print a content of the struct timespec64 in a format of %lld:%09ld. In order to make their lives easier, add the respecting specifier directly to the printf() implementation. Signed-off-by: Andy Shevchenko --- Documentation/core-api/printk-formats.rst | 11 ++++++++-- lib/tests/printf_kunit.c | 4 ++++ lib/vsprintf.c | 25 +++++++++++++++++++++++ 3 files changed, 38 insertions(+), 2 deletions(-) diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index 7f2f11b48286..6fdb417f5140 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -547,11 +547,13 @@ Time and date %pt[RT]s YYYY-mm-dd HH:MM:SS %pt[RT]d YYYY-mm-dd %pt[RT]t HH:MM:SS - %pt[RT][dt][r][s] + %ptSp . + %pt[RST][dt][r][s] For printing date and time as represented by:: - R struct rtc_time structure + R content of struct rtc_time + S content of struct timespec64 T time64_t type in human readable format. @@ -563,6 +565,11 @@ The %pt[RT]s (space) will override ISO 8601 separator by using ' ' (space) instead of 'T' (Capital T) between date and time. It won't have any effect when date or time is omitted. +The %ptSp is equivalent to %lld.%09ld for the content of the struct timespec64. +When the other specifiers given, it becomes the respective equivalent of +%ptT[dt][r][s].%09ld. In other words, the seconds are being printed in the +human readable format followed by dot and nanoseconds. + Passed by reference. struct clk diff --git a/lib/tests/printf_kunit.c b/lib/tests/printf_kunit.c index bc54cca2d7a6..7617e5b8b02c 100644 --- a/lib/tests/printf_kunit.c +++ b/lib/tests/printf_kunit.c @@ -504,6 +504,7 @@ time_and_date(struct kunit *kunittest) }; /* 2019-01-04T15:32:23 */ time64_t t = 1546615943; + struct timespec64 ts = { .tv_sec = t, .tv_nsec = 11235813 }; test("(%pt?)", "%pt", &tm); test("2018-11-26T05:35:43", "%ptR", &tm); @@ -522,6 +523,9 @@ time_and_date(struct kunit *kunittest) test("0119-00-04 15:32:23", "%ptTsr", &t); test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t); test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t); + + test("2019-01-04T15:32:23.011235813", "%ptS", &ts); + test("1546615943.011235813", "%ptSp", &ts); } static void diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 3f99834fd788..f29eb6368891 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1989,6 +1989,28 @@ char *time64_str(char *buf, char *end, const time64_t time, return rtc_str(buf, end, &rtc_time, spec, fmt); } +static noinline_for_stack +char *timespec64_str(char *buf, char *end, const struct timespec64 *ts, + struct printf_spec spec, const char *fmt) +{ + static const struct printf_spec default_dec09_spec = { + .base = 10, + .field_width = 9, + .precision = -1, + .flags = ZEROPAD, + }; + + if (fmt[2] == 'p') + buf = number(buf, end, ts->tv_sec, default_dec_spec); + else + buf = time64_str(buf, end, ts->tv_sec, spec, fmt); + if (buf < end) + *buf = '.'; + buf++; + + return number(buf, end, ts->tv_nsec, default_dec09_spec); +} + static noinline_for_stack char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, const char *fmt) @@ -1999,6 +2021,8 @@ char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, switch (fmt[1]) { case 'R': return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); + case 'S': + return timespec64_str(buf, end, (const struct timespec64 *)ptr, spec, fmt); case 'T': return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt); default: @@ -2464,6 +2488,7 @@ early_param("no_hash_pointers", no_hash_pointers_enable); * - 'g' For block_device name (gendisk + partition number) * - 't[RT][dt][r][s]' For time and date as represented by: * R struct rtc_time + * S struct timespec64 * T time64_t * - 'C' For a clock, it prints the name (Common Clock Framework) or address * (legacy clock framework) of the clock -- 2.50.1