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vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy

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find_timens_vvar_page() is not architecture-specific, as can be seen from
how all five per-architecture versions of it are the same.

(arm64, powerpc and riscv are exactly the same; x86 and s390 have two
characters difference inside a comment, less blank lines, and mark the
!CONFIG_TIME_NS version as inline.)

Refactor the five copies into a central copy in kernel/time/namespace.c.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221130115320.2918447-1-jannh@google.com
This commit is contained in:
Jann Horn
2022-11-30 12:53:20 +01:00
committed by Thomas Gleixner
parent e0d3da982c
commit d6c494e8ee
7 changed files with 24 additions and 109 deletions
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6
include/linux/time_namespace.h
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@@ -45,6 +45,7 @@ struct time_namespace *copy_time_ns(unsigned long flags,
void free_time_ns(struct time_namespace *ns);
void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
struct vdso_data *arch_get_vdso_data(void *vvar_page);
struct page *find_timens_vvar_page(struct vm_area_struct *vma);
static inline void put_time_ns(struct time_namespace *ns)
{
@@ -141,6 +142,11 @@ 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) { }