From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 12D6B3939B6; Mon, 22 Jun 2026 08:55:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782118533; cv=none; b=Nr6dvdZkTXnBPSvocgDrlI158dwAWM9BfnLo1lCgdK7ET86xtnxm3bGvMfJxEKnPdRk1LZsCOWDhJvJPyPBBiv2lyamvxVxv1TwkZR7jkmUwfjYlFL+zVB1C/4WDsunKhe4KIjA9/khUy/K9c1whZfjaKoTvKRr3RuXVDePRNwE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782118533; c=relaxed/simple; bh=IByh+22DFa1PqtEfpQjhNMO12rS/Q6Ppk6IvQq8sTxM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DAFedWHocjrJWWP5TZtI8MP0t/bzPwJRVGd7Llbcu5+3l2ALQDQv0XdXYPXgZFd6qq0KAsHm31/Pvfn01BxtF/U0IEw7/DQ6z7+gC6OX5pjJZywUDGTdZOWQomyyG8F7Pak0P6HN5t6kucyht9NotEyDRdAl6n03gOTX5qQsdJs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=JeGs/v3f; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JeGs/v3f" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=IByh+22DFa1PqtEfpQjhNMO12rS/Q6Ppk6IvQq8sTxM=; b=JeGs/v3f9+JKvnWtTB7MI3xZaQ f6s+plgAVDCxKLit3gTIzlHJP0hgCPMufYMU4PzDO02oKjTEDcI16a6FBgxEfbSl2UjDn3DVs0KIT s32GImnO/Z6UO1VBMXpka+qpLTPyEZELLWPjoFGCp46aZJ5/Ay3X7PcukVhwQThA0gX+YxzoryKkj TOBKDSnoK6s10laTDywZdkZyXkE590w/8yOVc+jMxlsw6XW8/+h+Q7AIX0DWp+JZdNKGyDyPgLQYy 5MfQWiTEjksQSRBiouEWZzjizfqb58/AfEfDsnDwM9/FjAmCjDnee6hu41S5eoCHmZunTiJYh0G1N ksS8dK3Q==; Received: from [2001:8b0:10b:5:9b49:795b:48f5:139a] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wbaRD-00000003wFP-0AWp; Mon, 22 Jun 2026 08:55:27 +0000 Message-ID: Subject: Re: [patch V2 18/25] timekeeping: Prepare for cross timestamps on arbitrary clock IDs From: David Woodhouse To: Thomas Gleixner , LKML Cc: Miroslav Lichvar , John Stultz , Stephen Boyd , Anna-Maria Behnsen , Frederic Weisbecker , thomas.weissschuh@linutronix.de, Arthur Kiyanovski , Rodolfo Giometti , Vincent Donnefort , Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, Oliver Upton , Richard Cochran , netdev@vger.kernel.org, Takashi Iwai , Miri Korenblit , Johannes Berg , Jacob Keller , Tony Nguyen , Saeed Mahameed , Peter Hilber , "Michael S. Tsirkin" , virtualization@lists.linux.dev, linux-wireless@vger.kernel.org, linux-sound@vger.kernel.org, Vadim Fedorenko Date: Mon, 22 Jun 2026 09:55:26 +0100 In-Reply-To: <20260529195557.846634842@kernel.org> References: <20260529193435.921555544@kernel.org> <20260529195557.846634842@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-NWErNWPxUZNYOFPg3M7Q" User-Agent: Evolution 3.60.3-0ubuntu1~ppa6 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-NWErNWPxUZNYOFPg3M7Q Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-05-29 at 22:01 +0200, Thomas Gleixner wrote: > From: Thomas Gleixner >=20 > PTP device system crosstime stamps support only CLOCK_REALTIME, which is > meaningless for AUX clocks. The PTP core hands in the clock ID already, s= o > prepare the core code to honor it. >=20 > =C2=A0- Add a new sys_systime field to struct system_device_crosststamp w= hich > =C2=A0=C2=A0 aliases the sys_realtime field. Once all users are converted > =C2=A0=C2=A0 sys_realtime can be removed. >=20 > =C2=A0- Prepare get_device_system_crosststamp() and the related code for = it by > =C2=A0=C2=A0 switching to sys_systime and providing the initial changes t= o utilize > =C2=A0=C2=A0 different time keepers. >=20 > No functional change intended. We ended up with ktime_get_snapshot_id() also supporting CLOCK_BOOTTIME and CLOCK_MONOTONIC_RAW, but not get_device_system_crosststamp(). 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