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timekeeping: Create struct tk_read_base and use it in struct timekeeper

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The members of the new struct are the required ones for the new NMI
safe accessor to clcok monotonic. In order to reuse the existing
timekeeping code and to make the update of the fast NMI safe
timekeepers a simple memcpy use the struct for the timekeeper as well
and convert all users.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Signed-off-by: John Stultz <[email protected]>
This commit is contained in:
Thomas Gleixner 2014-07-16 21:05:16 +00:00 • committed by John Stultz
commit d28ede8379
7 changed files with 158 additions and 150 deletions
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10
arch/arm64/kernel/vdso.c
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@ -211,7 +211,7 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
void update_vsyscall(struct timekeeper *tk)
{
struct timespec xtime_coarse;
u32 use_syscall = strcmp(tk->clock->name, "arch_sys_counter");
u32 use_syscall = strcmp(tk->tkr.clock->name, "arch_sys_counter");
++vdso_data->tb_seq_count;
smp_wmb();
@ -224,11 +224,11 @@ void update_vsyscall(struct timekeeper *tk)
vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;
if (!use_syscall) {
vdso_data->cs_cycle_last = tk->cycle_last;
vdso_data->cs_cycle_last = tk->tkr.cycle_last;
vdso_data->xtime_clock_sec = tk->xtime_sec;
vdso_data->xtime_clock_nsec = tk->xtime_nsec;
vdso_data->cs_mult = tk->mult;
vdso_data->cs_shift = tk->shift;
vdso_data->xtime_clock_nsec = tk->tkr.xtime_nsec;
vdso_data->cs_mult = tk->tkr.mult;
vdso_data->cs_shift = tk->tkr.shift;
}
smp_wmb();