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timekeeping: Remove CONFIG_GENERIC_TIME_VSYSCALL_OLD 

As of d4d1fc61eb (ia64: Update fsyscall gettime to use modern
vsyscall_update)the last user of CONFIG_GENERIC_TIME_VSYSCALL_OLD
have been updated, the legacy support for old-style vsyscall
implementations can be removed from the timekeeping code.

(Thanks again to Tony Luck for helping remove the last user!)

[jstultz: Commit message rework]

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Link: https://lkml.kernel.org/r/1510613491-16695-1-git-send-email-john.stultz@linaro.org
This commit is contained in:
Miroslav Lichvar 2017-11-13 14:51:31 -08:00 committed by Thomas Gleixner
parent 558de28249
commit aea3706cfc
3 changed files with 0 additions and 56 deletions
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7
include/linux/timekeeper_internal.h
View File

@ -136,13 +136,6 @@ struct timekeeper {
extern void update_vsyscall(struct timekeeper *tk);
extern void update_vsyscall_tz(void);
#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
struct clocksource *c, u32 mult,
u64 cycle_last);
extern void update_vsyscall_tz(void);
#else
static inline void update_vsyscall(struct timekeeper *tk)

4
kernel/time/Kconfig
View File

@ -21,10 +21,6 @@ config CLOCKSOURCE_VALIDATE_LAST_CYCLE
config GENERIC_TIME_VSYSCALL
bool
# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL_OLD
bool
# Old style timekeeping
config ARCH_USES_GETTIMEOFFSET
bool

45
kernel/time/timekeeping.c
View File

@ -557,45 +557,6 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
update_fast_timekeeper(&tkr_dummy, &tk_fast_raw);
}
#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
#warning Please contact your maintainers, as GENERIC_TIME_VSYSCALL_OLD compatibity will disappear soon.
static inline void update_vsyscall(struct timekeeper *tk)
{
struct timespec xt, wm;
xt = timespec64_to_timespec(tk_xtime(tk));
wm = timespec64_to_timespec(tk->wall_to_monotonic);
update_vsyscall_old(&xt, &wm, tk->tkr_mono.clock, tk->tkr_mono.mult,
tk->tkr_mono.cycle_last);
}
static inline void old_vsyscall_fixup(struct timekeeper *tk)
{
s64 remainder;
/*
* Store only full nanoseconds into xtime_nsec after rounding
* it up and add the remainder to the error difference.
* XXX - This is necessary to avoid small 1ns inconsistnecies caused
* by truncating the remainder in vsyscalls. However, it causes
* additional work to be done in timekeeping_adjust(). Once
* the vsyscall implementations are converted to use xtime_nsec
* (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD
* users are removed, this can be killed.
*/
remainder = tk->tkr_mono.xtime_nsec & ((1ULL << tk->tkr_mono.shift) - 1);
if (remainder != 0) {
tk->tkr_mono.xtime_nsec -= remainder;
tk->tkr_mono.xtime_nsec += 1ULL << tk->tkr_mono.shift;
tk->ntp_error += remainder << tk->ntp_error_shift;
tk->ntp_error -= (1ULL << tk->tkr_mono.shift) << tk->ntp_error_shift;
}
}
#else
#define old_vsyscall_fixup(tk)
#endif
static RAW_NOTIFIER_HEAD(pvclock_gtod_chain);
static void update_pvclock_gtod(struct timekeeper *tk, bool was_set)
@ -2163,12 +2124,6 @@ void update_wall_time(void)
/* correct the clock when NTP error is too big */
timekeeping_adjust(tk, offset);
/*
* XXX This can be killed once everyone converts
* to the new update_vsyscall.
*/
old_vsyscall_fixup(tk);
/*
* Finally, make sure that after the rounding
* xtime_nsec isn't larger than NSEC_PER_SEC