diff options
| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2026-03-26 12:42:31 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@kernel.org> | 2026-03-26 15:44:23 +0100 |
| commit | 1b6c89285d37114d7efe8ab04102a542581cd7da (patch) | |
| tree | 1254dd6d69b79fe060c6d0369b46967a32d86851 /include/linux | |
| parent | 5dc9cf835aba73c882348aa4f99be83b6e45ad9b (diff) | |
timens: Remove dependency on the vDSO
Previously, missing time namespace support in the vDSO meant that time
namespaces needed to be disabled globally. This was expressed in a hard
dependency on the generic vDSO library. This also meant that architectures
without any vDSO or only a stub vDSO could not enable time namespaces.
Now that all architectures using a real vDSO are using the generic library,
that dependency is not necessary anymore.
Remove the dependency and let all architectures enable time namespaces.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260326-vdso-timens-decoupling-v2-2-c82693a7775f@linutronix.de
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/time_namespace.h | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h index 0421bf1b13d7..c1de21a27c34 100644 --- a/include/linux/time_namespace.h +++ b/include/linux/time_namespace.h @@ -25,7 +25,9 @@ struct time_namespace { struct ucounts *ucounts; struct ns_common ns; struct timens_offsets offsets; +#ifdef CONFIG_TIME_NS_VDSO struct page *vvar_page; +#endif /* If set prevents changing offsets after any task joined namespace. */ bool frozen_offsets; } __randomize_layout; @@ -38,7 +40,6 @@ static inline struct time_namespace *to_time_ns(struct ns_common *ns) return container_of(ns, struct time_namespace, ns); } void __init time_ns_init(void); -extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); static inline struct time_namespace *get_time_ns(struct time_namespace *ns) { @@ -51,7 +52,6 @@ struct time_namespace *copy_time_ns(u64 flags, struct time_namespace *old_ns); void free_time_ns(struct time_namespace *ns); void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk); -struct page *find_timens_vvar_page(struct vm_area_struct *vma); static inline void put_time_ns(struct time_namespace *ns) { @@ -115,11 +115,6 @@ static inline void __init time_ns_init(void) { } -static inline void timens_commit(struct task_struct *tsk, - struct time_namespace *ns) -{ -} - static inline struct time_namespace *get_time_ns(struct time_namespace *ns) { return NULL; @@ -146,11 +141,6 @@ static inline void timens_on_fork(struct nsproxy *nsproxy, return; } -static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma) -{ - return NULL; -} - static inline void timens_add_monotonic(struct timespec64 *ts) { } static inline void timens_add_boottime(struct timespec64 *ts) { } @@ -167,4 +157,18 @@ static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) } #endif +#ifdef CONFIG_TIME_NS_VDSO +extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); +struct page *find_timens_vvar_page(struct vm_area_struct *vma); +#else /* !CONFIG_TIME_NS_VDSO */ +static inline void timens_commit(struct task_struct *tsk, struct time_namespace *ns) +{ +} + +static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma) +{ + return NULL; +} +#endif /* CONFIG_TIME_NS_VDSO */ + #endif /* _LINUX_TIMENS_H */ |