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| author | Dmitry Safonov <dima@arista.com> | 2019-11-12 01:27:10 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-01-14 12:20:57 +0100 |
| commit | 64b302ab66c5965702693e79690823ca120288b9 (patch) | |
| tree | c25dbd01ca0bf17e1e9ca9a0e0c53b80849f02c3 /include/linux/time_namespace.h | |
| parent | 660fd04f9317172ae90f414c68b18a26ae88a829 (diff) | |
| download | lwn-64b302ab66c5965702693e79690823ca120288b9.tar.gz lwn-64b302ab66c5965702693e79690823ca120288b9.zip | |
x86/vdso: Provide vdso_data offset on vvar_page
VDSO support for time namespaces needs to set up a page with the same
layout as VVAR. That timens page will be placed on position of VVAR page
inside namespace. That page has vdso_data->seq set to 1 to enforce
the slow path and vdso_data->clock_mode set to VCLOCK_TIMENS to enforce
the time namespace handling path.
To prepare the time namespace page the kernel needs to know the vdso_data
offset. Provide arch_get_vdso_data() helper for locating vdso_data on VVAR
page.
Co-developed-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-22-dima@arista.com
Diffstat (limited to 'include/linux/time_namespace.h')
| -rw-r--r-- | include/linux/time_namespace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h index 34ee110b5c35..063a343d1d78 100644 --- a/include/linux/time_namespace.h +++ b/include/linux/time_namespace.h @@ -39,6 +39,7 @@ struct time_namespace *copy_time_ns(unsigned long flags, struct time_namespace *old_ns); void free_time_ns(struct kref *kref); int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk); +struct vdso_data *arch_get_vdso_data(void *vvar_page); static inline void put_time_ns(struct time_namespace *ns) { |