[PATCH v3 00/36] sparc64: vdso: Switch to the generic vDSO library
Andreas Larsson
andreas at gaisler.com
Fri Sep 26 23:53:52 AEST 2025
On 2025-09-17 16:00, Thomas Weißschuh wrote:
> 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 at 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 (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
Tested-by: Andreas Larsson <andreas at gaisler.com>
Reviewed-by: Andreas Larsson <andreas at gaisler.com>
Acked-by: Andreas Larsson <andreas at gaisler.com> # arch/sparc
Thanks,
Andreas
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