lib/vdso: Move VCLOCK_TIMENS to vdso_clock_modes

Move the time namespace indicator clock mode to the other ones for
consistency sake.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124403.656097274@linutronix.de

include/linux/clocksource.h

@@ -34,6 +34,9 @@ enum vdso_clock_mode {
 	VDSO_ARCH_CLOCKMODES,
 #endif
 	VDSO_CLOCKMODE_MAX,
+
+	/* Indicator for time namespace VDSO */
+	VDSO_CLOCKMODE_TIMENS = INT_MAX
 };
 
 /**

include/vdso/datapage.h

@@ -21,8 +21,6 @@
 #define CS_RAW		1
 #define CS_BASES	(CS_RAW + 1)
 
-#define VCLOCK_TIMENS	UINT_MAX
-
 /**
  * struct vdso_timestamp - basetime per clock_id
  * @sec:	seconds

kernel/time/namespace.c

@@ -8,6 +8,7 @@
 #include <linux/user_namespace.h>
 #include <linux/sched/signal.h>
 #include <linux/sched/task.h>
+#include <linux/clocksource.h>
 #include <linux/seq_file.h>
 #include <linux/proc_ns.h>
 #include <linux/export.h>
@@ -172,8 +173,8 @@ static struct timens_offset offset_from_ts(struct timespec64 off)
  * for vdso_data->clock_mode is a non-issue. The task is spin waiting for the
  * update to finish and for 'seq' to become even anyway.
  *
- * Timens page has vdso_data->clock_mode set to VCLOCK_TIMENS which enforces
- * the time namespace handling path.
+ * Timens page has vdso_data->clock_mode set to VDSO_CLOCKMODE_TIMENS which
+ * enforces the time namespace handling path.
  */
 static void timens_setup_vdso_data(struct vdso_data *vdata,
 				   struct time_namespace *ns)
@@ -183,7 +184,7 @@ static void timens_setup_vdso_data(struct vdso_data *vdata,
 	struct timens_offset boottime = offset_from_ts(ns->offsets.boottime);
 
 	vdata->seq			= 1;
-	vdata->clock_mode		= VCLOCK_TIMENS;
+	vdata->clock_mode		= VDSO_CLOCKMODE_TIMENS;
 	offset[CLOCK_MONOTONIC]		= monotonic;
 	offset[CLOCK_MONOTONIC_RAW]	= monotonic;
 	offset[CLOCK_MONOTONIC_COARSE]	= monotonic;

lib/vdso/gettimeofday.c

@@ -116,10 +116,10 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
 
 	do {
 		/*
-		 * Open coded to handle VCLOCK_TIMENS. Time namespace
+		 * Open coded to handle VDSO_CLOCKMODE_TIMENS. Time namespace
 		 * enabled tasks have a special VVAR page installed which
 		 * has vd->seq set to 1 and vd->clock_mode set to
-		 * VCLOCK_TIMENS. For non time namespace affected tasks
+		 * VDSO_CLOCKMODE_TIMENS. For non time namespace affected tasks
 		 * this does not affect performance because if vd->seq is
 		 * odd, i.e. a concurrent update is in progress the extra
 		 * check for vd->clock_mode is just a few extra
@@ -128,7 +128,7 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
 		 */
 		while (unlikely((seq = READ_ONCE(vd->seq)) & 1)) {
 			if (IS_ENABLED(CONFIG_TIME_NS) &&
-			    vd->clock_mode == VCLOCK_TIMENS)
+			    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
 				return do_hres_timens(vd, clk, ts);
 			cpu_relax();
 		}
@@ -200,12 +200,12 @@ static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk,
 
 	do {
 		/*
-		 * Open coded to handle VCLOCK_TIMENS. See comment in
+		 * Open coded to handle VDSO_CLOCK_TIMENS. See comment in
 		 * do_hres().
 		 */
 		while ((seq = READ_ONCE(vd->seq)) & 1) {
 			if (IS_ENABLED(CONFIG_TIME_NS) &&
-			    vd->clock_mode == VCLOCK_TIMENS)
+			    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
 				return do_coarse_timens(vd, clk, ts);
 			cpu_relax();
 		}
@@ -292,7 +292,7 @@ __cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 
 	if (unlikely(tz != NULL)) {
 		if (IS_ENABLED(CONFIG_TIME_NS) &&
-		    vd->clock_mode == VCLOCK_TIMENS)
+		    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
 			vd = __arch_get_timens_vdso_data();
 
 		tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
@@ -308,7 +308,8 @@ static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time
 	const struct vdso_data *vd = __arch_get_vdso_data();
 	__kernel_old_time_t t;
 
-	if (IS_ENABLED(CONFIG_TIME_NS) && vd->clock_mode == VCLOCK_TIMENS)
+	if (IS_ENABLED(CONFIG_TIME_NS) &&
+	    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
 		vd = __arch_get_timens_vdso_data();
 
 	t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
@@ -332,7 +333,8 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
 	if (unlikely((u32) clock >= MAX_CLOCKS))
 		return -1;
 
-	if (IS_ENABLED(CONFIG_TIME_NS) && vd->clock_mode == VCLOCK_TIMENS)
+	if (IS_ENABLED(CONFIG_TIME_NS) &&
+	    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
 		vd = __arch_get_timens_vdso_data();
 
 	/*