kernel/git/next/linux-next.git/include/vdso/helpers.h, branch master

vdso: Replace ASSEMBLY with ASSEMBLER in header files

2026-06-29T13:44:08+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So standardize now on the __ASSEMBLER__ macro that is provided by the compilers. Signed-off-by: Thomas Huth Signed-off-by: Thomas Gleixner Reviewed-by: Vincenzo Frascino Link: https://patch.msgid.link/20260619100600.121042-1-thuth@redhat.com

vdso/helpers: Explicitly include vdso/processor.h

2026-03-11T14:22:26+00:00

The usage of cpu_relax() requires vdso/processor.h. Currently this header is included transitively, but that transitive inclusion is about to go away. Explicitly include the header. 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-v2-11-35d60acf7410@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/helpers: Add helpers for seqlocks of single vdso_clock

2025-07-09T09:52:34+00:00

Auxiliary clocks will have their vDSO data in a dedicated 'struct vdso_clock', which needs to be synchronized independently. Add a helper to synchronize a single vDSO clock. [ tglx: Move the SMP memory barriers to the call sites and get rid of the confusing first/last arguments and conditional barriers ] Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250701-vdso-auxclock-v1-4-df7d9f87b9b8@linutronix.de

vdso: Rework struct vdso_time_data and introduce struct vdso_clock

2025-03-08T13:37:41+00:00

To support multiple PTP clocks, the VDSO data structure needs to be reworked. All clock specific data will end up in struct vdso_clock and in struct vdso_time_data there will be an array of VDSO clocks. Now that all preparatory changes are in place: Split the clock related struct members into a separate struct vdso_clock. Make sure all users are aware, that vdso_time_data is no longer initialized as an array and vdso_clock is now the array inside vdso_data. Remove the vdso_clock define, which mapped it to vdso_time_data for the transition. Signed-off-by: Anna-Maria Behnsen Signed-off-by: Nam Cao Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-19-c1b5c69a166f@linutronix.de

vdso/helpers: Prepare introduction of struct vdso_clock

2025-03-08T13:37:40+00:00

To support multiple PTP clocks, the VDSO data structure needs to be reworked. All clock specific data will end up in struct vdso_clock and in struct vdso_time_data there will be an array of VDSO clocks. For now, vdso_clock is simply a define which maps vdso_clock to vdso_time_data. Prepare all functions which need the pointer to the vdso_clock array to work well after the structures get reworked. Replace the struct vdso_time_data pointer with a struct vdso_clock pointer where applicable. No functional change. Signed-off-by: Anna-Maria Behnsen Signed-off-by: Nam Cao Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-5-c1b5c69a166f@linutronix.de

vdso: Remove remnants of architecture-specific time storage

2025-02-21T08:54:03+00:00

All users of the time releated parts of the vDSO are now using the generic storage implementation. Remove the therefore unnecessary compatibility accessor functions and symbols. 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-v3-18-13a4669dfc8c@linutronix.de

random: vDSO: minimize and simplify header includes

2024-09-13T15:28:35+00:00

Depending on the architecture, building a 32-bit vDSO on a 64-bit kernel is problematic when some system headers are included. Minimise the amount of headers by moving needed items, such as __{get,put}_unaligned_t, into dedicated common headers and in general use more specific headers, similar to what was done in commit 8165b57bca21 ("linux/const.h: Extract common header for vDSO") and commit 8c59ab839f52 ("lib/vdso: Enable common headers"). On some architectures this results in missing PAGE_SIZE, as was described by commit 8b3843ae3634 ("vdso/datapage: Quick fix - use asm/page-def.h for ARM64"), so define this if necessary, in the same way as done prior by commit cffaefd15a8f ("vdso: Use CONFIG_PAGE_SHIFT in vdso/datapage.h"). Removing linux/time64.h leads to missing 'struct timespec64' in x86's asm/pvclock.h. Add a forward declaration of that struct in that file. Signed-off-by: Christophe Leroy Signed-off-by: Jason A. Donenfeld