diff options
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 60 |
1 files changed, 27 insertions, 33 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index ccb8759c8532..ce53dfa7130d 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -796,10 +796,30 @@ static cycle_t timebase_read(struct clocksource *cs) return (cycle_t)get_tb(); } -static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec, - u64 new_tb_to_xs, struct timespec *now, - u32 frac_sec) +void update_vsyscall(struct timespec *wall_time, struct timespec *wtm, + struct clocksource *clock, u32 mult) { + u64 new_tb_to_xs, new_stamp_xsec; + u32 frac_sec; + + if (clock != &clocksource_timebase) + return; + + /* Make userspace gettimeofday spin until we're done. */ + ++vdso_data->tb_update_count; + smp_mb(); + + /* XXX this assumes clock->shift == 22 */ + /* 4611686018 ~= 2^(20+64-22) / 1e9 */ + new_tb_to_xs = (u64) mult * 4611686018ULL; + new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC; + do_div(new_stamp_xsec, 1000000000); + new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC; + + BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC); + /* this is tv_nsec / 1e9 as a 0.32 fraction */ + frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32; + /* * tb_update_count is used to allow the userspace gettimeofday code * to assure itself that it sees a consistent view of the tb_to_xs and @@ -811,43 +831,17 @@ static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec, * We expect the caller to have done the first increment of * vdso_data->tb_update_count already. */ - vdso_data->tb_orig_stamp = new_tb_stamp; + vdso_data->tb_orig_stamp = clock->cycle_last; vdso_data->stamp_xsec = new_stamp_xsec; vdso_data->tb_to_xs = new_tb_to_xs; - vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec; - vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec; - vdso_data->stamp_xtime = *now; + vdso_data->wtom_clock_sec = wtm->tv_sec; + vdso_data->wtom_clock_nsec = wtm->tv_nsec; + vdso_data->stamp_xtime = *wall_time; vdso_data->stamp_sec_fraction = frac_sec; smp_wmb(); ++(vdso_data->tb_update_count); } -void update_vsyscall(struct timespec *wall_time, struct clocksource *clock, - u32 mult) -{ - u64 t2x, stamp_xsec; - u32 frac_sec; - - if (clock != &clocksource_timebase) - return; - - /* Make userspace gettimeofday spin until we're done. */ - ++vdso_data->tb_update_count; - smp_mb(); - - /* XXX this assumes clock->shift == 22 */ - /* 4611686018 ~= 2^(20+64-22) / 1e9 */ - t2x = (u64) mult * 4611686018ULL; - stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC; - do_div(stamp_xsec, 1000000000); - stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC; - - BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC); - /* this is tv_nsec / 1e9 as a 0.32 fraction */ - frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32; - update_gtod(clock->cycle_last, stamp_xsec, t2x, wall_time, frac_sec); -} - void update_vsyscall_tz(void) { /* Make userspace gettimeofday spin until we're done. */ |