linux-kernel - [PATCH v3 20/36] s390/time: Set up vDSO datapage later

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Message-Id: <20250917-vdso-sparc64-generic-2-v3-20-3679b1bc8ee8@linutronix.de>
Date: Wed, 17 Sep 2025 16:00:22 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Arnd Bergmann <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>, Nick Alcock <nick.alcock@...cle.com>, 
 John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>, 
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>, 
 Shuah Khan <shuah@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Theodore Ts'o <tytso@....edu>, 
 "Jason A. Donenfeld" <Jason@...c4.com>, 
 Russell King <linux@...linux.org.uk>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, 
 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, 
 Shannon Nelson <sln@...main.com>
Cc: linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev, 
 linux-mips@...r.kernel.org, linux-s390@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v3 20/36] s390/time: Set up vDSO datapage later

Upcoming changes to the generic vDSO library will mean that the vDSO
datapage will not yet be usable during time_early_init().

Move the initialization to time_init() which is called later. This is
valid as the value of tod_clock_base.tod does not change during the
lifetime of the machine and the vDSO datapage is only used much later.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/s390/kernel/time.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 63517b85f4c930b799235c381d9d6b263fff5431..6b948b9e61fe674bbc842a0143dd35a26b91a860 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -78,8 +78,6 @@ void __init time_early_init(void)
 	struct ptff_qto qto;
 	struct ptff_qui qui;

-	vdso_k_time_data->arch_data.tod_delta = tod_clock_base.tod;
-
 	if (!test_facility(28))
 		return;

@@ -248,6 +246,8 @@ struct clocksource * __init clocksource_default_clock(void)
  */
 void __init time_init(void)
 {
+	vdso_k_time_data->arch_data.tod_delta = tod_clock_base.tod;
+
 	/* Reset time synchronization interfaces. */
 	stp_reset();

-- 
2.51.0