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Message-Id: <20250917-vdso-sparc64-generic-2-v3-0-3679b1bc8ee8@linutronix.de>
Date: Wed, 17 Sep 2025 16:00:02 +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>,
Arnd Bergmann <arnd@...nel.org>
Subject: [PATCH v3 00/36] sparc64: vdso: Switch to the generic vDSO library
The generic vDSO provides a lot common functionality shared between
different architectures. SPARC is the last architecture not using it,
preventing some necessary code cleanup.
Make use of the generic infrastructure.
Follow-up to and replacement for Arnd's SPARC vDSO removal patches:
https://lore.kernel.org/lkml/20250707144726.4008707-1-arnd@kernel.org/
Tested on a Niagara T4 and QEMU.
This has a semantic conflict with my series "vdso: Reject absolute
relocations during build". The last patch of this series expects all users
of the generic vDSO library to use the vdsocheck tool.
This is not the case (yet) for SPARC64. I do have the patches for the
integration, the specifics will depend on which series is applied first.
Based on tip/timers/vdso.
[0] https://lore.kernel.org/lkml/20250812-vdso-absolute-reloc-v4-0-61a8b615e5ec@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v3:
- Allocate vDSO data pages dynamically (and lots of preparations for that)
- Drop clock_getres()
- Fix 32bit clock_gettime() syscall fallback
- Link to v2: https://lore.kernel.org/r/20250815-vdso-sparc64-generic-2-v2-0-b5ff80672347@linutronix.de
Changes in v2:
- Rebase on v6.17-rc1
- Drop RFC state
- Fix typo in commit message
- Drop duplicate 'select GENERIC_TIME_VSYSCALL'
- Merge "sparc64: time: Remove architecture-specific clocksource data" into the
main conversion patch. It violated the check in __clocksource_register_scale()
- Link to v1: https://lore.kernel.org/r/20250724-vdso-sparc64-generic-2-v1-0-e376a3bd24d1@linutronix.de
---
Arnd Bergmann (1):
clocksource: remove ARCH_CLOCKSOURCE_DATA
Thomas Weißschuh (35):
selftests: vDSO: vdso_test_correctness: Handle different tv_usec types
arm64: vDSO: getrandom: Explicitly include asm/alternative.h
arm64: vDSO: gettimeofday: Explicitly include vdso/clocksource.h
arm64: vDSO: compat_gettimeofday: Add explicit includes
ARM: vdso: gettimeofday: Add explicit includes
powerpc/vdso/gettimeofday: Explicitly include vdso/time32.h
powerpc/vdso: Explicitly include asm/cputable.h and asm/feature-fixups.h
LoongArch: vDSO: Explicitly include asm/vdso/vdso.h
MIPS: vdso: Add include guard to asm/vdso/vdso.h
MIPS: vdso: Explicitly include asm/vdso/vdso.h
random: vDSO: Add explicit includes
vdso/gettimeofday: Add explicit includes
vdso/helpers: Explicitly include vdso/processor.h
vdso/datapage: Remove inclusion of gettimeofday.h
vdso/datapage: Trim down unnecessary includes
random: vDSO: trim vDSO includes
random: vDSO: remove ifdeffery
random: vDSO: split out datapage update into helper functions
random: vDSO: only access vDSO datapage after random_init()
s390/time: Set up vDSO datapage later
vdso/datastore: Reduce scope of some variables in vvar_fault()
vdso/datastore: Drop inclusion of linux/mmap_lock.h
vdso/datastore: Map pages through struct page
vdso/datastore: Allocate data pages dynamically
sparc64: vdso: Link with -z noexecstack
sparc64: vdso: Remove obsolete "fake section table" reservation
sparc64: vdso: Replace code patching with runtime conditional
sparc64: vdso: Move hardware counter read into header
sparc64: vdso: Move syscall fallbacks into header
sparc64: vdso: Introduce vdso/processor.h
sparc64: vdso: Switch to the generic vDSO library
sparc64: vdso2c: Drop sym_vvar_start handling
sparc64: vdso2c: Remove symbol handling
sparc64: vdso: Implement clock_gettime64()
clocksource: drop include of asm/clocksource.h from linux/clocksource.h
arch/arm/include/asm/vdso/gettimeofday.h | 2 +
arch/arm64/include/asm/vdso/compat_gettimeofday.h | 3 +
arch/arm64/include/asm/vdso/gettimeofday.h | 2 +
arch/arm64/kernel/vdso/vgetrandom.c | 2 +
arch/loongarch/kernel/process.c | 1 +
arch/loongarch/kernel/vdso.c | 1 +
arch/mips/include/asm/vdso/vdso.h | 5 +
arch/mips/kernel/vdso.c | 1 +
arch/powerpc/include/asm/vdso/gettimeofday.h | 1 +
arch/powerpc/include/asm/vdso/processor.h | 3 +
arch/s390/kernel/time.c | 4 +-
arch/sparc/Kconfig | 3 +-
arch/sparc/include/asm/clocksource.h | 9 -
arch/sparc/include/asm/processor.h | 3 +
arch/sparc/include/asm/processor_32.h | 2 -
arch/sparc/include/asm/processor_64.h | 25 --
arch/sparc/include/asm/vdso.h | 2 -
arch/sparc/include/asm/vdso/clocksource.h | 10 +
arch/sparc/include/asm/vdso/gettimeofday.h | 184 ++++++++++
arch/sparc/include/asm/vdso/processor.h | 41 +++
arch/sparc/include/asm/vdso/vsyscall.h | 10 +
arch/sparc/include/asm/vvar.h | 75 ----
arch/sparc/kernel/Makefile | 1 -
arch/sparc/kernel/time_64.c | 6 +-
arch/sparc/kernel/vdso.c | 69 ----
arch/sparc/vdso/Makefile | 8 +-
arch/sparc/vdso/vclock_gettime.c | 380 ++-------------------
arch/sparc/vdso/vdso-layout.lds.S | 26 +-
arch/sparc/vdso/vdso.lds.S | 2 -
arch/sparc/vdso/vdso2c.c | 24 --
arch/sparc/vdso/vdso2c.h | 45 +--
arch/sparc/vdso/vdso32/vdso32.lds.S | 4 +-
arch/sparc/vdso/vma.c | 274 +--------------
drivers/char/random.c | 75 ++--
include/linux/clocksource.h | 8 -
include/linux/vdso_datastore.h | 6 +
include/vdso/datapage.h | 23 +-
include/vdso/helpers.h | 1 +
init/main.c | 2 +
kernel/time/Kconfig | 4 -
lib/vdso/datastore.c | 73 ++--
lib/vdso/getrandom.c | 3 +
lib/vdso/gettimeofday.c | 17 +
.../testing/selftests/vDSO/vdso_test_correctness.c | 8 +-
44 files changed, 451 insertions(+), 997 deletions(-)
---
base-commit: 5f84f6004e298bd41c9e4ed45c18447954b1dce6
change-id: 20250722-vdso-sparc64-generic-2-25f2e058e92c
Best regards,
--
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
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