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clocksource: Add common vdso clock mode storage

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All architectures which use the generic VDSO code have their own storage
for the VDSO clock mode. That's pointless and just requires duplicate code.

Provide generic storage for it. The new Kconfig symbol is intermediate and
will be removed once all architectures are converted over.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124403.028046322@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-02-07 13:38:55 +01:00
parent eec399dd86
commit 5d51bee725
5 changed files with 42 additions and 5 deletions
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13
lib/vdso/gettimeofday.c
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@@ -7,6 +7,7 @@
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/hrtimer_defs.h>
#include <linux/clocksource.h>
#include <vdso/datapage.h>
#include <vdso/helpers.h>
@@ -64,10 +65,14 @@ static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
do {
seq = vdso_read_begin(vd);
if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
vd->clock_mode == VDSO_CLOCKMODE_NONE)
return -1;
cycles = __arch_get_hw_counter(vd->clock_mode);
ns = vdso_ts->nsec;
last = vd->cycle_last;
if (unlikely((s64)cycles < 0))
if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
unlikely((s64)cycles < 0))
return -1;
ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
@@ -132,10 +137,14 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
}
smp_rmb();
if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
vd->clock_mode == VDSO_CLOCKMODE_NONE)
return -1;
cycles = __arch_get_hw_counter(vd->clock_mode);
ns = vdso_ts->nsec;
last = vd->cycle_last;
if (unlikely((s64)cycles < 0))
if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
unlikely((s64)cycles < 0))
return -1;
ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);