/* SPDX-License-Identifier: GPL-2.0 */#ifndef _TIME_NAMESPACE_INTERNAL_H#define _TIME_NAMESPACE_INTERNAL_H #include <linux/mutex.h> struct time_namespace; /* * Protects possibly multiple offsets writers racing each other * and tasks entering the namespace. */extern struct mutex timens_offset_lock; #ifdef CONFIG_TIME_NS_VDSOint timens_vdso_alloc_vvar_page(struct time_namespace *ns);void timens_vdso_free_vvar_page(struct time_namespace *ns);#else /* !CONFIG_TIME_NS_VDSO */static inline int timens_vdso_alloc_vvar_page(struct time_namespace *ns){	return 0;}static inline void timens_vdso_free_vvar_page(struct time_namespace *ns){}#endif /* CONFIG_TIME_NS_VDSO */ #endif /* _TIME_NAMESPACE_INTERNAL_H */