linux-kernel - [PATCH 05/11] time: Build generic update_vsyscall() only with generic time vDSO

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Message-Id: <20250826-vdso-cleanups-v1-5-d9b65750e49f@linutronix.de>
Date: Tue, 26 Aug 2025 08:17:08 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Nam Cao <namcao@...utronix.de>, 
 Russell King <linux@...linux.org.uk>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 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>, Arnd Bergmann <arnd@...db.de>, 
 Christian Brauner <brauner@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev, 
 linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
 linux-s390@...r.kernel.org, linux-arch@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 Rasmus Villemoes <linux@...musvillemoes.dk>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 05/11] time: Build generic update_vsyscall() only with
 generic time vDSO

The generic vDSO can be used without the time-related functionality.
In that case the generic update_vsyscall() from kernel/time/vsyscall.c
should not be built.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 kernel/time/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index e6e9b85d4db5f8dd5d9b574ef7bb0a281b9daa6d..f7d52d9543cc7a2d1a18db179229a8d7936317d3 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -26,7 +26,7 @@ obj-$(CONFIG_LEGACY_TIMER_TICK)			+= tick-legacy.o
 ifeq ($(CONFIG_SMP),y)
  obj-$(CONFIG_NO_HZ_COMMON)			+= timer_migration.o
 endif
-obj-$(CONFIG_HAVE_GENERIC_VDSO)			+= vsyscall.o
+obj-$(CONFIG_GENERIC_GETTIMEOFDAY)		+= vsyscall.o
 obj-$(CONFIG_DEBUG_FS)				+= timekeeping_debug.o
 obj-$(CONFIG_TEST_UDELAY)			+= test_udelay.o
 obj-$(CONFIG_TIME_NS)				+= namespace.o

-- 
2.50.1