linux-toradex.git/arch/arm64/kernel/vdso32, branch master

kbuild: Consolidate C dialect options

2026-03-12T11:52:37+00:00

Introduce CC_FLAGS_DIALECT to make it easier to update the various
places in the tree that rely on the GNU C standard and Microsoft
extensions flags atomically. All remaining uses of '-std=gnu11' and
'-fms-extensions' are in the tools directory (which has its own build
system) and other standalone Makefiles. This will allow the kernel to
use a narrower option to enable the Microsoft anonymous tagged structure
extension in a simpler manner. Place the CC_FLAGS_DIALECT block after
the configuration include (so that a future change can move the
selection of the flag to Kconfig) but before the
arch/$(SRCARCH)/Makefile include (so that CC_FLAGS_DIALECT is available
for use in those Makefiles).

Signed-off-by: Nathan Chancellor 
Reviewed-by: Nicolas Schier 
Acked-by: Ard Biesheuvel 
Acked-by: Helge Deller   # parisc
Link: https://patch.msgid.link/20260223-fms-anonymous-structs-v1-1-8ee406d3c36c@kernel.org
Signed-off-by: Nicolas Schier

arm64: vdso32: Provide clock_getres_time64()

2026-01-13T13:42:23+00:00

For consistency with __vdso_clock_gettime64() there should also be a
64-bit variant of clock_getres(). This will allow the extension of
CONFIG_COMPAT_32BIT_TIME to the vDSO and finally the removal of 32-bit
time types from the kernel and UAPI.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Acked-by: Will Deacon 
Link: https://patch.msgid.link/20251223-vdso-compat-time32-v1-8-97ea7a06a543@linutronix.de

kbuild: Add '-fms-extensions' to areas with dedicated CFLAGS

2025-10-31T01:26:28+00:00

This is a follow up to commit c4781dc3d1cf ("Kbuild: enable
-fms-extensions") but in a separate change due to being substantially
different from the initial submission.

There are many places within the kernel that use their own CFLAGS
instead of the main KBUILD_CFLAGS, meaning code written with the main
kernel's use of '-fms-extensions' in mind that may be tangentially
included in these areas will result in "error: declaration does not
declare anything" messages from the compiler.

Add '-fms-extensions' to all these areas to ensure consistency, along
with -Wno-microsoft-anon-tag to silence clang's warning about use of the
extension that the kernel cares about using. parisc does not build with
clang so it does not need this warning flag. LoongArch does not need it
either because -W flags from KBUILD_FLAGS are pulled into cflags-vdso.

Reported-by: Christian Brauner 
Closes: https://lore.kernel.org/20251030-meerjungfrau-getrocknet-7b46eacc215d@brauner/
Reviewed-by: Christian Brauner 
Acked-by: Ard Biesheuvel 
Signed-off-by: Nathan Chancellor

Merge tag 'timers-vdso-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-09-30T23:58:21+00:00

Pull VDSO updates from Thomas Gleixner:

 - Further consolidation of the VDSO infrastructure and the common data
   store

 - Simplification of the related Kconfig logic

 - Improve the VDSO selftest suite

* tag 'timers-vdso-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  selftests: vDSO: Drop vdso_test_clock_getres
  selftests: vDSO: vdso_test_abi: Add tests for clock_gettime64()
  selftests: vDSO: vdso_test_abi: Test CPUTIME clocks
  selftests: vDSO: vdso_test_abi: Use explicit indices for name array
  selftests: vDSO: vdso_test_abi: Drop clock availability tests
  selftests: vDSO: vdso_test_abi: Use ksft_finished()
  selftests: vDSO: vdso_test_abi: Correctly skip whole test with missing vDSO
  selftests: vDSO: Fix -Wunitialized in powerpc VDSO_CALL() wrapper
  vdso: Add struct __kernel_old_timeval forward declaration to gettime.h
  vdso: Gate VDSO_GETRANDOM behind HAVE_GENERIC_VDSO
  vdso: Drop Kconfig GENERIC_VDSO_TIME_NS
  vdso: Drop Kconfig GENERIC_VDSO_DATA_STORE
  vdso: Drop kconfig GENERIC_COMPAT_VDSO
  vdso: Drop kconfig GENERIC_VDSO_32
  riscv: vdso: Untangle Kconfig logic
  time: Build generic update_vsyscall() only with generic time vDSO
  vdso/gettimeofday: Remove !CONFIG_TIME_NS stubs
  vdso: Move ENABLE_COMPAT_VDSO from core to arm64
  ARM: VDSO: Remove cntvct_ok global variable
  vdso/datastore: Gate time data behind CONFIG_GENERIC_GETTIMEOFDAY

arm64: vdso32: Respect -Werror from kbuild

2025-09-08T15:21:40+00:00

The compiler flags for the compat vDSO are built manually as they are not
compatible with the ones from kbuild. CONFIG_WERROR is not respected.

Explicitly inherit -Werror from kbuild.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Will Deacon

arm64: vdso32: Stop suppressing warnings

2025-09-08T15:21:40+00:00

These warnings don't seem to trigger anymore. Probably due to the
introduction of the vdso/ header namespace. Nowadays these suppression
only hide real problems.

Re-enable the warnings.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Will Deacon

vdso: Move ENABLE_COMPAT_VDSO from core to arm64

2025-09-04T09:23:49+00:00

The ENABLE_COMAPT_VDSO symbol is only used by arm64 and only for the
time-related functionality. There should be no new users, so it doesn't
need to be in the generic vDSO code.

Move the logic into arm64 architecture-specific code and replace the
explicit define by the standard '#ifdef __aarch64__'.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Acked-by: Catalin Marinas 
Link: https://lore.kernel.org/all/20250826-vdso-cleanups-v1-3-d9b65750e49f@linutronix.de

arm64: vdso: Switch to generic storage implementation

2025-02-21T08:54:01+00:00

The generic storage implementation provides the same features as the
custom one. However it can be shared between architectures, making
maintenance easier.

This switch also moves the random state data out of the time data page.
The currently used hardcoded __VDSO_RND_DATA_OFFSET does not take into
account changes to the time data page layout.

Co-developed-by: Nam Cao 
Signed-off-by: Nam Cao 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-8-13a4669dfc8c@linutronix.de

vdso: Rename included Makefile

2025-02-21T08:54:01+00:00

As the Makefile is included into other Makefiles it can not be used to
define objects to be built from the current source directory.
However the generic datastore will introduce such a local source file.
Rename the included Makefile so it is clear how it is to be used and to
make room for a regular Makefile in lib/vdso/.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-4-13a4669dfc8c@linutronix.de

arm64: vdso: Drop LBASE_VDSO

2024-11-02T11:37:33+00:00

This constant is always "0", providing no value and making the logic
harder to understand.
Also prepare for a consolidation of the vdso linkerscript logic by
aligning it with other architectures.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Acked-by: Will Deacon 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-4-b64f0842d512@linutronix.de