linux.git/lib/vdso, branch v7.1-rc7

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

vdso/gettimeofday: Add a helper to read the sequence lock of a time namespace aware clock

2026-03-11T09:27:35+00:00

Currently there are three different open-coded variants of a time
namespace aware variant of vdso_read_begin(). They make the code hard to
read and introduce an inconsistency, as only the first copy uses
unlikely().

Split the code into a shared helper function.
Move that next to the definition of the regular vdso_read_begin(), so
that any future changes can be kept in sync easily.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20260227-vdso-cleanups-v1-2-c848b4bc4850@linutronix.de

vdso/gettimeofday: Drop a few usages of __maybe_unused

2026-03-11T09:27:35+00:00

These functions are used from the very same file,
so this annotation is unnecessary.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20260227-vdso-cleanups-v1-1-c848b4bc4850@linutronix.de