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lib/vdso: Move VCLOCK_TIMENS to vdso_clock_modes

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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
This commit is contained in:
Thomas Gleixner 2020-02-07 13:39:01 +01:00
parent c7a18100bd
commit 2d6b01bd88
4 changed files with 17 additions and 13 deletions
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3
include/linux/clocksource.h
View File

@ -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
};
/**

2
include/vdso/datapage.h
View File

@ -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

7
kernel/time/namespace.c
View File

@ -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;

18
lib/vdso/gettimeofday.c
View File

@ -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();
/*