linux-kernel - [PATCH RFC 00/14] sparc64: vdso: Switch to generic vDSO library

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Message-Id: <20250724-vdso-sparc64-generic-2-v1-0-e376a3bd24d1@linutronix.de>
Date: Thu, 24 Jul 2025 08:26:50 +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>, Shuah Khan <shuah@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>, 
 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, 
 Shannon Nelson <shannon.nelson@....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>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 sparclinux@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 Arnd Bergmann <arnd@...nel.org>
Subject: [PATCH RFC 00/14] sparc64: vdso: Switch to 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/

Only tested on QEMU.
Based von v6.16-rc1.
Marked as RFC for testing and review only.
Will be properly resubmitted after v6.17-rc1.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Arnd Bergmann (1):
      clocksource: remove ARCH_CLOCKSOURCE_DATA

Thomas Weißschuh (13):
      vdso: add struct __kernel_old_timeval forward declaration to gettime.h
      sparc64: time: Remove architecture-specific clocksource data
      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()
      sparc64: vdso: Implement clock_getres()

 arch/sparc/Kconfig                         |   5 +-
 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 | 208 ++++++++++++++++
 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           | 382 +++--------------------------
 arch/sparc/vdso/vdso-layout.lds.S          |  26 +-
 arch/sparc/vdso/vdso.lds.S                 |   4 +-
 arch/sparc/vdso/vdso2c.c                   |  24 --
 arch/sparc/vdso/vdso2c.h                   |  45 +---
 arch/sparc/vdso/vdso32/vdso32.lds.S        |   6 +-
 arch/sparc/vdso/vma.c                      | 274 ++-------------------
 include/linux/clocksource.h                |   6 +-
 include/vdso/gettime.h                     |   1 +
 kernel/time/Kconfig                        |   4 -
 25 files changed, 344 insertions(+), 902 deletions(-)
---
base-commit: eaa6313d2ceb2a3f1c870866621058ad6081f028
change-id: 20250722-vdso-sparc64-generic-2-25f2e058e92c

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>