linux.git/lib/vdso, branch master

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

vdso/datastore: Allocate data pages dynamically

2026-03-11T09:18:30+00:00

Allocating the data pages as part of the kernel image does not work on
SPARC. The MMU will raise a fault when userspace tries to access them.

Allocate the data pages through the page allocator instead.

Unused pages in the vDSO VMA are still allocated to keep the virtual
addresses aligned. Switch the mapping from PFNs to 'struct page' as that is
required for dynamically allocated pages.  This also aligns the allocation
of the datapages with the code pages and is a prerequisite for mlockall()
support.

VM_MIXEDMAP is necessary for the call to vmf_insert_page() in the timens
prefault path to work.

The data pages need to be order-0, non-compound pages so that the mapping
to userspace and the different orderings work.

These pages are also used by the timekeeping, random pool and architecture
initialization code. Some of these are running before the page allocator is
available. To keep these subsytems working without changes, introduce
early, statically data storage which will then replaced by the real one as
soon as that is available.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Christophe Leroy (CS GROUP) 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-3-d8eb3b0e1410@linutronix.de

vdso/datastore: Drop inclusion of linux/mmap_lock.h

2026-03-11T09:18:30+00:00

This header is unnecessary and together with some upcoming changes would
introduce compiler warnings.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Reviewed-by: Christophe Leroy (CS GROUP) 
Link: https://lore.kernel.org/lkml/20250916-mm-rcuwait-v1-1-39a3beea6ec3@linutronix.de/
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-2-d8eb3b0e1410@linutronix.de