[PATCH v3 0/4] vdso/gettimeofday: Add support for ALARM clocks

[Thomas Weißschuh]

Extend the generic vDSO library to also handle CLOCK_BOOTTIME_ALARM
and CLOCK_REALTIME_ALARM.

This has a conflict with the alartimer changes in tip/timers/core.
Resolve it by moving vdso_time_enable_alarmclock() after
WRITE_ONCE(rtcdev, rtc).  Or I will just resend the patches next cycle.

Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
Changes in v3:
- Return an error when the RTC device is missing.
- Rebase on tip/timers/vdso.
- Link to v2: https://patch.msgid.link/20260929-vdso-alarm-clocks-v2-0-a7af4089a698@xxxxxxxxxxxxxx

Changes in v2:
- Rebase on tip/timers/vdso.
- Add Signed-off-by tags.
- Link to v1: https://patch.msgid.link/20260921-vdso-alarm-clocks-v1-0-617abb5271c7@xxxxxxxxxxxxxx

---
Thomas Weißschuh (4):
      selftests: vDSO: vdso_test_abi: Also test ALARM clocks
      vdso: Add alarmclock support infrastructure
      vdso/gettimeofday: Add support for CLOCK_BOOTTIME_ALARM
      vdso/gettimeofday: Add support for CLOCK_REALTIME_ALARM

 include/vdso/datapage.h                      |  4 +++-
 kernel/time/alarmtimer.c                     |  2 ++
 kernel/time/timekeeping_internal.h           |  4 ++++
 kernel/time/vsyscall.c                       | 18 ++++++++++++++++++
 lib/vdso/gettimeofday.c                      | 12 ++++++++++++
 tools/testing/selftests/vDSO/vdso_test_abi.c |  4 +++-
 6 files changed, 42 insertions(+), 2 deletions(-)
---
base-commit: 689868cc2af9cae9a4eff90eadf5726bdc20cd82
change-id: 20260921-vdso-alarm-clocks-6502a551ad5c

Best regards,
--  
Thomas Weißschuh <linux@xxxxxxxxxxxxxx>