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Message-Id: <20250826-vdso-cleanups-v1-10-d9b65750e49f@linutronix.de> Date: Tue, 26 Aug 2025 08:17:13 +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 10/11] vdso: Drop kconfig GENERIC_VDSO_TIME_NS All architectures implementing time-related functionality in the vDSO are using the generic vDSO library which handles time namespaces properly. Remove the now unnecessary kconfig symbol. Enables the use of time namespaces on architectures, which use the generic vDSO but did not enable GENERIC_VDSO_TIME_NS, namely MIPS and arm. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de> --- Technically this is still too restrictive, as it prevents architectures without a real vDSO to enable CONFIG_TIME_NS. Right now this restriction only protects the SPARC vDSO. I have patches to drop it completely, as soon as SPARC is usingthe generic vDSO. --- arch/arm64/Kconfig | 1 - arch/loongarch/Kconfig | 1 - arch/powerpc/Kconfig | 1 - arch/riscv/Kconfig | 1 - arch/s390/Kconfig | 1 - arch/x86/Kconfig | 1 - init/Kconfig | 2 +- lib/vdso/Kconfig | 6 ------ tools/testing/selftests/pidfd/config | 1 - 9 files changed, 1 insertion(+), 14 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b0f007b396c81906d3a0a66f8a240d97e0ae2d88..e19b006842e223441b87370a5ae23756e0e85883 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -162,7 +162,6 @@ config ARM64 select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY - select GENERIC_VDSO_TIME_NS select HARDIRQS_SW_RESEND select HAS_IOPORT select HAVE_MOVE_PMD diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index d15b201d55f951d95435a38789cf47ea9f0adac9..754626b58b929e605d51c441cfa862bd504b5892 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -108,7 +108,6 @@ config LOONGARCH select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL - select GENERIC_VDSO_TIME_NS select GPIOLIB select HAS_IOPORT select HAVE_ARCH_AUDITSYSCALL diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 78c82af955616c57ab38ea1241e3471eb8d0a65d..d715e3d65b5c29e0010b0a5e5821aee34e31e176 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -207,7 +207,6 @@ config PPC select GENERIC_PCI_IOMAP if PCI select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL - select GENERIC_VDSO_TIME_NS select HAS_IOPORT if PCI select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index f6cf9180ccf2c9774248fea93a8276de3791ad71..6e5efbeb83d7f0fe556bc04ec9f58b80d2780b43 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -121,7 +121,6 @@ config RISCV select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL if GENERIC_GETTIMEOFDAY - select GENERIC_VDSO_TIME_NS if GENERIC_GETTIMEOFDAY select HARDIRQS_SW_RESEND select HAS_IOPORT if MMU select HAVE_ALIGNED_STRUCT_PAGE diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 696d2243d64b04e77b9b4631fc8bc301916b48ae..e06ebbd860da93a8c838113c3c1b946d51dfe1b4 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -167,7 +167,6 @@ config S390 select GENERIC_GETTIMEOFDAY select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL - select GENERIC_VDSO_TIME_NS select GENERIC_IOREMAP if PCI select HAVE_ALIGNED_STRUCT_PAGE select HAVE_ARCH_AUDITSYSCALL diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1e74b2a356e42bdc0ede258f44e18ba29dd90174..d1961811e291e8adcf0b46fafbd53f0a44b5d25b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -181,7 +181,6 @@ config X86 select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY - select GENERIC_VDSO_TIME_NS select GENERIC_VDSO_OVERFLOW_PROTECT select GUP_GET_PXX_LOW_HIGH if X86_PAE select HARDIRQS_SW_RESEND diff --git a/init/Kconfig b/init/Kconfig index 83632025121937527523f5977a493bd3ae24ed9f..5c429a184d1b0550dda9f075ffcbffb68c6d8f50 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1346,7 +1346,7 @@ config UTS_NS config TIME_NS bool "TIME namespace" - depends on GENERIC_VDSO_TIME_NS + depends on GENERIC_GETTIMEOFDAY default y help In this namespace boottime and monotonic clocks can be set. diff --git a/lib/vdso/Kconfig b/lib/vdso/Kconfig index 48ffb0f6fa413ea7da4e43c7f7a24cb232b38ea1..3d2c2b90d193f984e3a202e701fa7f0bfa8f1938 100644 --- a/lib/vdso/Kconfig +++ b/lib/vdso/Kconfig @@ -12,12 +12,6 @@ config GENERIC_GETTIMEOFDAY Each architecture that enables this feature has to provide the fallback implementation. -config GENERIC_VDSO_TIME_NS - bool - help - Selected by architectures which support time namespaces in the - VDSO - config GENERIC_VDSO_OVERFLOW_PROTECT bool help diff --git a/tools/testing/selftests/pidfd/config b/tools/testing/selftests/pidfd/config index 6133524710f790c1f83af6f2b628de9b62eee6c3..cf7cc0ce02484e91799b7cb132447283f818d729 100644 --- a/tools/testing/selftests/pidfd/config +++ b/tools/testing/selftests/pidfd/config @@ -4,6 +4,5 @@ CONFIG_USER_NS=y CONFIG_PID_NS=y CONFIG_NET_NS=y CONFIG_TIME_NS=y -CONFIG_GENERIC_VDSO_TIME_NS=y CONFIG_CGROUPS=y CONFIG_CHECKPOINT_RESTORE=y -- 2.50.1
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