diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vdso/gettimeofday.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c index 7938d3c4901d..bcc9a98a0524 100644 --- a/lib/vdso/gettimeofday.c +++ b/lib/vdso/gettimeofday.c @@ -38,6 +38,13 @@ static inline bool vdso_clocksource_ok(const struct vdso_data *vd) } #endif +#ifndef vdso_cycles_ok +static inline bool vdso_cycles_ok(u64 cycles) +{ + return true; +} +#endif + #ifdef CONFIG_TIME_NS static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk, struct __kernel_timespec *ts) @@ -62,6 +69,8 @@ static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk, return -1; cycles = __arch_get_hw_counter(vd->clock_mode); + if (unlikely(!vdso_cycles_ok(cycles))) + return -1; ns = vdso_ts->nsec; last = vd->cycle_last; ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult); @@ -130,6 +139,8 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk, return -1; cycles = __arch_get_hw_counter(vd->clock_mode); + if (unlikely(!vdso_cycles_ok(cycles))) + return -1; ns = vdso_ts->nsec; last = vd->cycle_last; ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult); |