From nobody Wed Oct 8 19:12:17 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 2FF0D2E173C; Wed, 25 Jun 2025 18:38:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750876731; cv=none; b=XdR55Mg/vnSLCpZOr/iuB/ONYrWk+sDR+b6/2Adj6yV1N/L98E+KSbWv8iw6F6jmHkfRVggn2lYGlaBKtulgfiaGze5twVHz7DHnpEtQL0wNMWiWMKeHkkAHtUO3YVr1AMYJKQU1p2IP4j1CrfGMHqu2DW8awUpByfdTcJ0jdoo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750876731; c=relaxed/simple; bh=dlw8KDSGu+ehPJAe+navRVPjiPuj28L8LmFkc1hGo6U=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=FPkiJ3nes3nmcsXFLAFzh1ORaC4U2BP/ew/0H7cCH5TtnFcyhQoFWie0L1jCcm6+Pnm27Zx0S+kPegqkejox5qwFcKCw7M6QjxsJsvqhgK4cMy80ZcKNY6Ev4FhtODGfAjxukL56D5Tsn7amU8t2cof3wdbqE0hWGsmPejuwneU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=1gLUyO0W; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=azNXTnOV; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="1gLUyO0W"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="azNXTnOV" Message-ID: <20250625183758.382451331@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1750876728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=rgazCkd3u3F5i4CrLdkq+/PjRiwjzzoSmk6V32qkK3I=; b=1gLUyO0W1GJamInYQ2FeJDYwutkPTRLou2YJcNFHXCXJKBlEEO6K7HoQzL3qdoNzl9qV2P j7/iPeSyM/0c2wV2KUcc7mCYx4drBGhB9paoRLI//gMxjLxAZaZrXcmjrIUIzubSA17zna f0dqi2H9tQG3bcC4tI2WwnvL9yyrmxvAIv5TK96PHJV3gGNGtsEH7tCGHN0LOKvjGAYYXr CqzJooFRLbcyLGuHHgLqpSD1EUlK92S5v2PGOMv4YcopeUOIv5Jxm8GvJnl6oEAdEVQsa1 5fJg6aZsfbrB3+BAYzJSfnFX+1eW5GyRUIok28YW+h8pVcv5h7yz7WcThPJKVw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1750876728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=rgazCkd3u3F5i4CrLdkq+/PjRiwjzzoSmk6V32qkK3I=; b=azNXTnOV9H7Fx2+NFomVcQD0LzodKYeFxbrd8WBXpqpAWI1XVJrPEwRTwBME1GD7dZaI4E Ctr0D6DRh0T8OHAA== From: Thomas Gleixner To: LKML Cc: netdev@vger.kernel.org, Richard Cochran , Christopher Hall , John Stultz , Frederic Weisbecker , Anna-Maria Behnsen , Miroslav Lichvar , Werner Abt , David Woodhouse , Stephen Boyd , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Kurt Kanzenbach , Nam Cao , Antoine Tenart Subject: [patch V3 10/11] timekeeping: Provide update for auxiliary timekeepers References: <20250625182951.587377878@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Wed, 25 Jun 2025 20:38:47 +0200 (CEST) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update the auxiliary timekeepers periodically. For now this is tied to the = system timekeeper update from the tick. This might be revisited and moved out of t= he tick. Signed-off-by: Thomas Gleixner Acked-by: John Stultz --- kernel/time/timekeeping.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) --- --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -131,9 +131,11 @@ static struct tk_fast tk_fast_raw ____c #ifdef CONFIG_POSIX_AUX_CLOCKS static __init void tk_aux_setup(void); static void tk_aux_update_clocksource(void); +static void tk_aux_advance(void); #else static inline void tk_aux_setup(void) { } static inline void tk_aux_update_clocksource(void) { } +static inline void tk_aux_advance(void) { } #endif =20 unsigned long timekeeper_lock_irqsave(void) @@ -2312,11 +2314,13 @@ static bool timekeeping_advance(enum tim /** * update_wall_time - Uses the current clocksource to increment the wall t= ime * + * It also updates the enabled auxiliary clock timekeepers */ void update_wall_time(void) { if (timekeeping_advance(TK_ADV_TICK)) clock_was_set_delayed(); + tk_aux_advance(); } =20 /** @@ -2762,6 +2766,20 @@ static void tk_aux_update_clocksource(vo } } =20 +static void tk_aux_advance(void) +{ + unsigned long active =3D READ_ONCE(aux_timekeepers); + unsigned int id; + + for_each_set_bit(id, &active, BITS_PER_LONG) { + struct tk_data *tkd =3D &timekeeper_data[id + TIMEKEEPER_AUX_FIRST]; + + guard(raw_spinlock)(&tkd->lock); + if (tkd->shadow_timekeeper.clock_valid) + __timekeeping_advance(tkd, TK_ADV_TICK); + } +} + /** * ktime_get_aux - Get time for a AUX clock * @id: ID of the clock to read (CLOCK_AUX...)