linux.git/lib/vdso, branch v7.2-rc1

Merge tag 'timers-vdso-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

2026-06-15T08:27:13+00:00

Pull vdso updates from Thomas Gleixner:

 - Remove the redundant CONFIG_GENERIC_TIME_VSYSCALL after converting
   the remaining users over.

 - Rework and sanitize the MIPS VDSO handling, so it does not handle the
   time related VDSO if there is no VDSO capable clocksource available.
   Also stop mapping VDSO data pages unconditionally even if there is no
   usage possible.

* tag 'timers-vdso-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip:
  MIPS: VDSO: Fold MIPS_CLOCK_VSYSCALL into MIPS_GENERIC_GETTIMEOFDAY
  MIPS: VDSO: Gate microMIPS restriction on GCC version
  MIPS: VDSO: Fold MIPS_DISABLE_VDSO into MIPS_GENERIC_GETTIMEOFDAY
  clocksource/drivers/mips-gic-timer: Only use VDSO_CLOCKMODE_GIC when it is a available
  MIPS: csrc-r4k: Only use VDSO_CLOCKMODE_R4K when it is a available
  MIPS: VDSO: Only map the data pages when the vDSO is used
  MIPS: Introduce Kconfig MIPS_GENERIC_GETTIMEOFDAY
  vdso/datastore: Always provide symbol declarations
  MAINTAINERS: Add include/linux/vdso_datastore.h to vDSO block
  vdso/gettimeofday: Rename __arch_get_vdso_u_timens_data()
  vdso/treewide: Drop GENERIC_TIME_VSYSCALL
  vdso/vsyscall: Gate update_vsyscall() behind CONFIG_GENERIC_GETTIMEOFDAY
  riscv: vdso: Drop CONFIG_GENERIC_TIME_VSYSCALL guard around syscall fallbacks

vdso/gettimeofday: Rename __arch_get_vdso_u_timens_data()

2026-06-04T16:22:45+00:00

Originally this function was supposed to work the same way as
__arch_get_vdso_u_time_data() and be overridden on some architectures.
However the actually used implementation, which just adds PAGE_SIZE, does
not need this override mechanism.

Adjust the name to reflect the true nature of the function.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20260519-vdso-arch_get_vdso_u_timens_data-v1-1-43f0d62716e8@linutronix.de

vdso/datastore: Mark vdso_k_*_data pointers as __ro_after_init

2026-06-02T19:39:29+00:00

These pointers are only modified once in vdso_setup_data_pages(),
during the init phase. Make them read-only after that.

Drop __refdata as that would conflict with __ro_after_init.
Modpost does accept the reference from a __ro_after_init symbol to
an __init one.

Fixes: 05988dba1179 ("vdso/datastore: Allocate data pages dynamically")
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20260513-vdso-ro-after-init-v1-1-4b51f74015a4@linutronix.de

vdso/gettimeofday: Reload sequence counter after switch to time page in do_aux()

2026-05-14T10:30:53+00:00

After switching to the real data pages, the sequence counter needs to be
reloaded from there. The code using vdso_read_begin_timens() assumed
this worked by 'continue' jumping to the *beginning* of the do-while
retry loop. However the 'continue' jumps to the *end* of said loop,
evaluating the exit condition. If the data page has a sequence counter
of '1' it will match the one from the time namespace page and prematurely
exit the retry loop. This would result in garbage returned to the caller.

Reload the sequence counter after switching the pages by using an inner
while loop again, which will loop at most once.

The loop generates slightly better code than an explicit reload through
'seq = vdso_read_begin()'.

Fixes: ed78b7b2c5ae ("vdso/gettimeofday: Add a helper to read the sequence lock of a time namespace aware clock")
Reported-by: Ricardo Ribalda 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Ricardo Ribalda 
Reviewed-by: Christophe Leroy (CS GROUP) 
Link: https://patch.msgid.link/20260422-vdso-aux-timens-loop-v1-1-e2dd8c7164cc@linutronix.de
Closes: https://lore.kernel.org/lkml/CANiDSCsOy0P1if-gJZqOM5pTJ0RDcwVfru1B7KFbTOEMqjPKJw@mail.gmail.com/

vdso/timens: Move functions to new file

2026-03-26T14:44:22+00:00

As a preparation of the untangling of time namespaces and the vDSO, move
the glue functions between those subsystems into a new file.

While at it, switch the mutex lock and mmap_read_lock() in the vDSO
namespace code to guard().

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20260326-vdso-timens-decoupling-v2-1-c82693a7775f@linutronix.de

vdso/datapage: Remove inclusion of gettimeofday.h

2026-03-11T14:22:32+00:00

vdso/datapage.h is useful without pulling in the architecture-specific
gettimeofday() helpers.

Move the include to the only users which needs it.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov (AMD) 
Link: https://patch.msgid.link/20260227-vdso-header-cleanups-v2-12-35d60acf7410@linutronix.de

vdso/gettimeofday: Add explicit includes

2026-03-11T14:13:00+00:00

Various used symbols are only visible through transitive includes.
These transitive includes are about to go away.

Explicitly include the necessary headers.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov (AMD) 
Link: https://patch.msgid.link/20260227-vdso-header-cleanups-v2-10-35d60acf7410@linutronix.de

random: vDSO: Add explicit includes

2026-03-11T14:12:55+00:00

Various used symbols are only visible through transitive includes.
These transitive includes are about to go away.

Explicitly include the necessary headers.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov (AMD) 
Acked-by: Jason A. Donenfeld 
Link: https://patch.msgid.link/20260227-vdso-header-cleanups-v2-9-35d60acf7410@linutronix.de

vdso/gettimeofday: Move the unlikely() into vdso_read_retry()

2026-03-11T14:12:05+00:00

All callers of vdso_read_retry() test its return value with unlikely().
Move the unlikely into the helper to make the code easier to read.
This is equivalent to the retry function of non-vDSO seqlocks.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov (AMD) 
Link: https://patch.msgid.link/20260227-vdso-cleanups-v1-4-c848b4bc4850@linutronix.de

vdso/gettimeofday: Add a helper to test if a clock is namespaced

2026-03-11T14:09:59+00:00

Currently this logic is duplicate multiple times.

Add a helper for it to make the code more readable.

  [ bp: Add a missing clocksource.h include, see
    https://lore.kernel.org/r/20260311113435-f72f81d8-33a6-4a0f-bd80-4997aad068cc@linutronix.de ]

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov (AMD) 
Link: https://patch.msgid.link/20260227-vdso-cleanups-v1-3-c848b4bc4850@linutronix.de