linux.git/arch/sparc/vdso, branch master

sparc64: vdso: Implement clock_gettime64()

2026-03-11T09:18:33+00:00

To be y2038-safe, 32-bit userspace needs to explicitly call the 64-bit safe
time APIs.

Implement clock_gettime64() in the 32-bit vDSO.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-13-d8eb3b0e1410@linutronix.de

sparc64: vdso2c: Remove symbol handling

2026-03-11T09:18:33+00:00

There are no handled symbols left.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-12-d8eb3b0e1410@linutronix.de

sparc64: vdso2c: Drop sym_vvar_start handling

2026-03-11T09:18:32+00:00

After the adoption of the generic vDSO library this symbol does not exist.

The alignment invariant is now guaranteed by the generic code.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-11-d8eb3b0e1410@linutronix.de

sparc64: vdso: Switch to the generic vDSO library

2026-03-11T09:18:32+00:00

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.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-10-d8eb3b0e1410@linutronix.de

sparc64: vdso: Move syscall fallbacks into header

2026-03-11T09:18:32+00:00

The generic vDSO libraries expected the syscall fallbacks in
asm/vdso/gettimeofday.h. To prepare the adoption of the generic library,
move the existing functions there.

While at it, rename them so they match what the generic library expects.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-8-d8eb3b0e1410@linutronix.de

sparc64: vdso: Move hardware counter read into header

2026-03-11T09:18:31+00:00

The generic vDSO libraries expected the architecture glue around hardware
counter reading in asm/vdso/gettimeofday.h. To prepare the adoption of the
generic library, move the existing functions there.

While at it, perform some trivial alignment with the generic vDSO library:
* Drop 'notrace', as the functions are __always_inline anyways
* Use the same parameter types
* Use the same function names

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-7-d8eb3b0e1410@linutronix.de

sparc64: vdso: Replace code patching with runtime conditional

2026-03-11T09:18:31+00:00

The patching logic is unnecessarily complicated and stands in the way of
the adoption of the generic vDSO framework.

Replace it by a simple runtime switch, similar to other architectures.

Suggested-by: Thomas Gleixner 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://lore.kernel.org/lkml/87ecu9tfhw.ffs@tglx/
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-6-d8eb3b0e1410@linutronix.de

sparc64: vdso: Remove obsolete "fake section table" reservation

2026-03-11T09:18:31+00:00

When the vDSO logic was copied from x86 to SPARC some unused remnants of
the fake section handling were copied, too. In x86 the original fake
section handling had already been removed incompletely in commit
da861e18eccc ("x86, vdso: Get rid of the fake section mechanism").
On x86 the reservation was only cleaned up in commit 24b7c77bbb24
("x86/vdso: Remove obsolete "fake section table" reservation").

Remove the reservation for SPARC, too.

Fixes: 9a08862a5d2e ("vDSO for sparc")
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-5-d8eb3b0e1410@linutronix.de

sparc64: vdso: Link with -z noexecstack

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

The vDSO stack does not need to be executable. Prevent the linker from
creating executable. For more background see commit ffcf9c5700e4 ("x86:
link vdso and boot with -z noexecstack --no-warn-rwx-segments").

Also prevent the following warning from the linker:
sparc64-linux-ld: warning: arch/sparc/vdso/vdso-note.o: missing .note.GNU-stack section implies executable stack
sparc64-linux-ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker

Fixes: 9a08862a5d2e ("vDSO for sparc")
Suggested-by: Arnd Bergmann 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Tested-by: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Acked-by: Andreas Larsson 
Link: https://lore.kernel.org/lkml/20250707144726.4008707-1-arnd@kernel.org/
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-4-d8eb3b0e1410@linutronix.de

sparc64: vdso: Use 32-bit CHECKFLAGS for compat vDSO

2026-03-11T09:15:42+00:00

When building the compat vDSO the CHECKFLAGS from the 64-bit kernel
are used. These are combined with the 32-bit CFLAGS. This confuses
sparse, producing false-positive warnings or potentially missing
real issues.

Manually override the CHECKFLAGS for the compat vDSO with the correct
32-bit configuration.

Reported-by: kernel test robot 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Acked-by: Arnd Bergmann 
Link: https://patch.msgid.link/20260302-vdso-compat-checkflags-v2-2-78e55baa58ba@linutronix.de
Closes: https://lore.kernel.org/lkml/202511030021.9v1mIgts-lkp@intel.com/