From: "Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
To: Andy Lutomirski <luto@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
"David S. Miller" <davem@davemloft.net>,
Andreas Larsson <andreas@gaisler.com>,
Nick Alcock <nick.alcock@oracle.com>,
John Stultz <jstultz@google.com>,
Stephen Boyd <sboyd@kernel.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Shuah Khan <shuah@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Theodore Ts'o <tytso@mit.edu>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Russell King <linux@armlinux.org.uk>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Shannon Nelson <sln@onemain.com>,
Thomas Gleixner <tglx@kernel.org>,
Christophe Leroy <chleroy@kernel.org>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
linux-kselftest@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev,
linux-mips@vger.kernel.org, linux-s390@vger.kernel.org,
"Thomas Weißschuh" <thomas.weissschuh@linutronix.de>,
"Arnd Bergmann" <arnd@kernel.org>,
"Thomas Gleixner" <tglx@kernel.org>
Subject: [PATCH v6 00/14] sparc64: vdso: Switch to the generic vDSO library
Date: Wed, 04 Mar 2026 08:48:57 +0100 [thread overview]
Message-ID: <20260304-vdso-sparc64-generic-2-v6-0-d8eb3b0e1410@linutronix.de> (raw)
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/
SPARC64 can not map .bss into userspace, so the vDSO datapages are
switched over to be allocated dynamically.
Tested on a Niagara T4 and QEMU.
This has emantic conflicts with
* "vdso: Reject absolute relocations during build" [0]
* "vDSO: Respect COMPAT_32BIT_TIME" [1]
But I expect both other serieses to need more discussions.
[0] https://lore.kernel.org/lkml/20250812-vdso-absolute-reloc-v4-0-61a8b615e5ec@linutronix.de/
[1] https://lore.kernel.org/lkml/20260227-vdso-compat_32bit_time-v1-0-3f0286a7bac3@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Changes in v6:
- Provide statically allocated during early boot to avoid canges to the rng core
- Use non-compound data pages
- Reword commit messages
- Rebase on v7.0-rc1
- Link to v5: https://lore.kernel.org/r/20251106-vdso-sparc64-generic-2-v5-0-97ff2b6542f7@linutronix.de
Changes in v5:
- Merge the patches for 'struct page' mapping and dynamic allocation
- Zero out newly-allocated data pages
- Pick up review tags
- Link to v4: https://lore.kernel.org/r/20251014-vdso-sparc64-generic-2-v4-0-e0607bf49dea@linutronix.de
Changes in v4:
- Rebase on v6.18-rc1.
- Keep inclusion of asm/clocksource.h from linux/clocksource.h
- Reword description of "s390/time: Set up vDSO datapage later"
- Link to v3: https://lore.kernel.org/r/20250917-vdso-sparc64-generic-2-v3-0-3679b1bc8ee8@linutronix.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 (13):
vdso/datastore: Reduce scope of some variables in vvar_fault()
vdso/datastore: Drop inclusion of linux/mmap_lock.h
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()
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 ++-------------------
include/linux/clocksource.h | 6 +-
include/linux/vdso_datastore.h | 6 +
init/main.c | 2 +
kernel/time/Kconfig | 4 -
lib/vdso/datastore.c | 97 +++++---
27 files changed, 375 insertions(+), 943 deletions(-)
---
base-commit: f02e02079ac56b44ff89d4c2189cf7185ab794f3
change-id: 20250722-vdso-sparc64-generic-2-25f2e058e92c
Best regards,
--
Thomas Weißschuh <thomas.weissschuh@linutronix.de>
next reply other threads:[~2026-03-04 7:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-04 7:48 Thomas Weißschuh [this message]
2026-03-04 7:48 ` [PATCH v6 01/14] vdso/datastore: Reduce scope of some variables in vvar_fault() Thomas Weißschuh
2026-03-04 8:10 ` Christophe Leroy (CS GROUP)
2026-03-04 7:48 ` [PATCH v6 02/14] vdso/datastore: Drop inclusion of linux/mmap_lock.h Thomas Weißschuh
2026-03-04 8:11 ` Christophe Leroy (CS GROUP)
2026-03-04 7:49 ` [PATCH v6 03/14] vdso/datastore: Allocate data pages dynamically Thomas Weißschuh
2026-03-04 8:49 ` Christophe Leroy (CS GROUP)
2026-03-04 7:49 ` [PATCH v6 04/14] sparc64: vdso: Link with -z noexecstack Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 05/14] sparc64: vdso: Remove obsolete "fake section table" reservation Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 06/14] sparc64: vdso: Replace code patching with runtime conditional Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 07/14] sparc64: vdso: Move hardware counter read into header Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 08/14] sparc64: vdso: Move syscall fallbacks " Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 09/14] sparc64: vdso: Introduce vdso/processor.h Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 10/14] sparc64: vdso: Switch to the generic vDSO library Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 11/14] sparc64: vdso2c: Drop sym_vvar_start handling Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 12/14] sparc64: vdso2c: Remove symbol handling Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 13/14] sparc64: vdso: Implement clock_gettime64() Thomas Weißschuh
2026-03-04 7:49 ` [PATCH v6 14/14] clocksource: remove ARCH_CLOCKSOURCE_DATA Thomas Weißschuh
2026-03-05 15:17 ` [PATCH v6 00/14] sparc64: vdso: Switch to the generic vDSO library Nathaniel Roach
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