Re: [PATCH v2 1/5] RISC-V: Remove per cpu clocksource

From: Daniel Lezcano
Date: Fri Aug 16 2019 - 11:09:14 EST


On 31/07/2019 03:24, Atish Patra wrote:
> There is only one clocksource in RISC-V. The boot cpu initializes
> that clocksource. No need to keep a percpu data structure.

That is not what is stated in the initial patch [1].

Can you clarify that ?

Thanks

-- Daniel

[1] https://lkml.org/lkml/2018/8/4/51


> Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> ---
> drivers/clocksource/timer-riscv.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index 5e6038fbf115..09e031176bc6 100644
> --- a/drivers/clocksource/timer-riscv.c
> +++ b/drivers/clocksource/timer-riscv.c
> @@ -55,7 +55,7 @@ static u64 riscv_sched_clock(void)
> return get_cycles64();
> }
>
> -static DEFINE_PER_CPU(struct clocksource, riscv_clocksource) = {
> +static struct clocksource riscv_clocksource = {
> .name = "riscv_clocksource",
> .rating = 300,
> .mask = CLOCKSOURCE_MASK(64),
> @@ -92,7 +92,6 @@ void riscv_timer_interrupt(void)
> static int __init riscv_timer_init_dt(struct device_node *n)
> {
> int cpuid, hartid, error;
> - struct clocksource *cs;
>
> hartid = riscv_of_processor_hartid(n);
> if (hartid < 0) {
> @@ -112,8 +111,7 @@ static int __init riscv_timer_init_dt(struct device_node *n)
>
> pr_info("%s: Registering clocksource cpuid [%d] hartid [%d]\n",
> __func__, cpuid, hartid);
> - cs = per_cpu_ptr(&riscv_clocksource, cpuid);
> - error = clocksource_register_hz(cs, riscv_timebase);
> + error = clocksource_register_hz(&riscv_clocksource, riscv_timebase);
> if (error) {
> pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
> error, cpuid);
>


--
<http://www.linaro.org/> Linaro.org â Open source software for ARM SoCs

Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog