vdso/namespace: Rename timens_setup_vdso_data() to reflect new vdso_clock struct

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 array of VDSO clocks. At the moment,
vdso_clock is simply a define which maps vdso_clock to vdso_time_data.

For time namespaces, vdso_time_data needs to be set up. But only the clock
related part of the vdso_data thats requires this setup. To reflect the
future struct vdso_clock, rename timens_setup_vdso_data() to
timns_setup_vdso_clock_data().

No functional change.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-13-c1b5c69a166f@linutronix.de

Author: anna-marialx

kernel/time/namespace.c

@@ -176,8 +176,8 @@ static struct timens_offset offset_from_ts(struct timespec64 off)
  * Timens page has vdso_time_data->clock_mode set to VDSO_CLOCKMODE_TIMENS which
  * enforces the time namespace handling path.
  */
-static void timens_setup_vdso_data(struct vdso_time_data *vdata,
-				   struct time_namespace *ns)
+static void timens_setup_vdso_clock_data(struct vdso_time_data *vdata,
+					 struct time_namespace *ns)
 {
 	struct timens_offset *offset = vdata->offset;
 	struct timens_offset monotonic = offset_from_ts(ns->offsets.monotonic);
@@ -238,7 +238,7 @@ static void timens_set_vvar_page(struct task_struct *task,
 	vdata = page_address(ns->vvar_page);
 
 	for (i = 0; i < CS_BASES; i++)
-		timens_setup_vdso_data(&vdata[i], ns);
+		timens_setup_vdso_clock_data(&vdata[i], ns);
 
 out:
 	mutex_unlock(&offset_lock);

lib/vdso/datastore.c

@@ -109,7 +109,7 @@ struct vm_area_struct *vdso_install_vvar_mapping(struct mm_struct *mm, unsigned
  * non-root time namespace. Whenever a task changes its namespace, the VVAR
  * page tables are cleared and then they will be re-faulted with a
  * corresponding layout.
- * See also the comment near timens_setup_vdso_data() for details.
+ * See also the comment near timens_setup_vdso_clock_data() for details.
  */
 int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 {