* [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init
@ 2021-12-01 12:50 Peng Fan (OSS)
2021-12-01 12:50 ` [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask Peng Fan (OSS)
` (2 more replies)
0 siblings, 3 replies; 8+ messages in thread
From: Peng Fan (OSS) @ 2021-12-01 12:50 UTC (permalink / raw)
To: daniel.lezcano, tglx, shawnguo, s.hauer
Cc: kernel, festevam, linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Peng Fan, Kees Cook
From: Peng Fan <peng.fan@nxp.com>
sys_ctr_base and cmpcr will not be updated after init, so mark
as __ro_after_init.
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/clocksource/timer-imx-sysctr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c
index 18b90fc56bfc..2b309af11266 100644
--- a/drivers/clocksource/timer-imx-sysctr.c
+++ b/drivers/clocksource/timer-imx-sysctr.c
@@ -20,8 +20,8 @@
#define SYS_CTR_CLK_DIV 0x3
-static void __iomem *sys_ctr_base;
-static u32 cmpcr;
+static void __iomem *sys_ctr_base __ro_after_init;
+static u32 cmpcr __ro_after_init;
static void sysctr_timer_enable(bool enable)
{
--
2.25.1
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^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask
2021-12-01 12:50 [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Peng Fan (OSS)
@ 2021-12-01 12:50 ` Peng Fan (OSS)
2021-12-02 10:22 ` Daniel Lezcano
2021-12-03 0:05 ` [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Kees Cook
2021-12-09 13:15 ` Daniel Lezcano
2 siblings, 1 reply; 8+ messages in thread
From: Peng Fan (OSS) @ 2021-12-01 12:50 UTC (permalink / raw)
To: daniel.lezcano, tglx, shawnguo, s.hauer
Cc: kernel, festevam, linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Peng Fan
From: Peng Fan <peng.fan@nxp.com>
Actually we have CLOCK_EVT_FEAT_DYNIRQ, the irq affinity will be runtime
changed and no issue. But the system counter timer is not tied to CPU0,
so use cpu_possible_mask here.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/clocksource/timer-imx-sysctr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c
index 2b309af11266..55a8e198d2a1 100644
--- a/drivers/clocksource/timer-imx-sysctr.c
+++ b/drivers/clocksource/timer-imx-sysctr.c
@@ -119,7 +119,7 @@ static struct timer_of to_sysctr = {
static void __init sysctr_clockevent_init(void)
{
- to_sysctr.clkevt.cpumask = cpumask_of(0);
+ to_sysctr.clkevt.cpumask = cpu_possible_mask;
clockevents_config_and_register(&to_sysctr.clkevt,
timer_of_rate(&to_sysctr),
--
2.25.1
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^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask
2021-12-01 12:50 ` [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask Peng Fan (OSS)
@ 2021-12-02 10:22 ` Daniel Lezcano
2021-12-05 12:53 ` Peng Fan
0 siblings, 1 reply; 8+ messages in thread
From: Daniel Lezcano @ 2021-12-02 10:22 UTC (permalink / raw)
To: Peng Fan (OSS), tglx, shawnguo, s.hauer
Cc: kernel, festevam, linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Peng Fan
On 01/12/2021 13:50, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> Actually we have CLOCK_EVT_FEAT_DYNIRQ, the irq affinity will be runtime
> changed and no issue. But the system counter timer is not tied to CPU0,
> so use cpu_possible_mask here.
Did you mean:
"There is no reason to tie the system counter timer to CPU0, change its
affinity to cpu_possible_mask.
Moreover, the timer has the flag CLOCK_EVT_FEAT_DYNIRQ set, changing to
cpu_possibl_mask will reduce the number of wakeups related to the system
timer"
?
Note you may want to explain why 'there is no reason'
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> drivers/clocksource/timer-imx-sysctr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c
> index 2b309af11266..55a8e198d2a1 100644
> --- a/drivers/clocksource/timer-imx-sysctr.c
> +++ b/drivers/clocksource/timer-imx-sysctr.c
> @@ -119,7 +119,7 @@ static struct timer_of to_sysctr = {
>
> static void __init sysctr_clockevent_init(void)
> {
> - to_sysctr.clkevt.cpumask = cpumask_of(0);
> + to_sysctr.clkevt.cpumask = cpu_possible_mask;
>
> clockevents_config_and_register(&to_sysctr.clkevt,
> timer_of_rate(&to_sysctr),
>
--
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^ permalink raw reply [flat|nested] 8+ messages in thread* RE: [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask
2021-12-02 10:22 ` Daniel Lezcano
@ 2021-12-05 12:53 ` Peng Fan
0 siblings, 0 replies; 8+ messages in thread
From: Peng Fan @ 2021-12-05 12:53 UTC (permalink / raw)
To: Daniel Lezcano, Peng Fan (OSS), tglx, shawnguo, s.hauer
Cc: kernel, festevam, dl-linux-imx, linux-kernel, linux-arm-kernel,
van.freenix
> Subject: Re: [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to
> cpu_possible_mask
>
> On 01/12/2021 13:50, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > Actually we have CLOCK_EVT_FEAT_DYNIRQ, the irq affinity will be
> > runtime changed and no issue. But the system counter timer is not tied
> > to CPU0, so use cpu_possible_mask here.
>
> Did you mean:
>
> "There is no reason to tie the system counter timer to CPU0, change its
> affinity to cpu_possible_mask.
>
> Moreover, the timer has the flag CLOCK_EVT_FEAT_DYNIRQ set, changing to
> cpu_possibl_mask will reduce the number of wakeups related to the system
> timer"
The syctr interrupt could be set affinity to any cores in the SoC. Default affinity
is set to cpu 0.
This timer will be used as broadcast timer on all the i.MX SoCs. Because DYNIRQ
flag set, the core time framework will runtime set the interrupt affinity to the cores
that needs to wake up and the cpumask will runtime set to the core that will be
wake up. So even the sysctr initialization use cpumask 0, there is no issue,
the current patch is just use cpu_possible_mask to show the fact that the
timer supports routed to all the cpu cores and nothing else.
Thanks,
Peng.
>
> ?
>
> Note you may want to explain why 'there is no reason'
>
>
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > ---
> > drivers/clocksource/timer-imx-sysctr.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/clocksource/timer-imx-sysctr.c
> > b/drivers/clocksource/timer-imx-sysctr.c
> > index 2b309af11266..55a8e198d2a1 100644
> > --- a/drivers/clocksource/timer-imx-sysctr.c
> > +++ b/drivers/clocksource/timer-imx-sysctr.c
> > @@ -119,7 +119,7 @@ static struct timer_of to_sysctr = {
> >
> > static void __init sysctr_clockevent_init(void) {
> > - to_sysctr.clkevt.cpumask = cpumask_of(0);
> > + to_sysctr.clkevt.cpumask = cpu_possible_mask;
> >
> > clockevents_config_and_register(&to_sysctr.clkevt,
> > timer_of_rate(&to_sysctr),
> >
>
>
> --
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init
2021-12-01 12:50 [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Peng Fan (OSS)
2021-12-01 12:50 ` [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask Peng Fan (OSS)
@ 2021-12-03 0:05 ` Kees Cook
2021-12-09 13:15 ` Daniel Lezcano
2 siblings, 0 replies; 8+ messages in thread
From: Kees Cook @ 2021-12-03 0:05 UTC (permalink / raw)
To: Peng Fan (OSS)
Cc: daniel.lezcano, tglx, shawnguo, s.hauer, kernel, festevam,
linux-imx, linux-kernel, linux-arm-kernel, van.freenix, Peng Fan
On Wed, Dec 01, 2021 at 08:50:29PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> sys_ctr_base and cmpcr will not be updated after init, so mark
> as __ro_after_init.
>
> Cc: Kees Cook <keescook@chromium.org>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
Always nice to get more of these. :)
Reviewed-by: Kees Cook <keescook@chromium.org>
Thanks!
-Kees
> ---
> drivers/clocksource/timer-imx-sysctr.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c
> index 18b90fc56bfc..2b309af11266 100644
> --- a/drivers/clocksource/timer-imx-sysctr.c
> +++ b/drivers/clocksource/timer-imx-sysctr.c
> @@ -20,8 +20,8 @@
>
> #define SYS_CTR_CLK_DIV 0x3
>
> -static void __iomem *sys_ctr_base;
> -static u32 cmpcr;
> +static void __iomem *sys_ctr_base __ro_after_init;
> +static u32 cmpcr __ro_after_init;
>
> static void sysctr_timer_enable(bool enable)
> {
> --
> 2.25.1
>
--
Kees Cook
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init
2021-12-01 12:50 [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Peng Fan (OSS)
2021-12-01 12:50 ` [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask Peng Fan (OSS)
2021-12-03 0:05 ` [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Kees Cook
@ 2021-12-09 13:15 ` Daniel Lezcano
2021-12-14 8:25 ` Peng Fan
2 siblings, 1 reply; 8+ messages in thread
From: Daniel Lezcano @ 2021-12-09 13:15 UTC (permalink / raw)
To: Peng Fan (OSS), tglx, shawnguo, s.hauer
Cc: kernel, festevam, linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Peng Fan, Kees Cook
On 01/12/2021 13:50, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> sys_ctr_base and cmpcr will not be updated after init, so mark
> as __ro_after_init.
>
> Cc: Kees Cook <keescook@chromium.org>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> drivers/clocksource/timer-imx-sysctr.c | 4 ++--
Applied, thanks
--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
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^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init
2021-12-09 13:15 ` Daniel Lezcano
@ 2021-12-14 8:25 ` Peng Fan
2021-12-14 9:19 ` Daniel Lezcano
0 siblings, 1 reply; 8+ messages in thread
From: Peng Fan @ 2021-12-14 8:25 UTC (permalink / raw)
To: Daniel Lezcano, Peng Fan (OSS), tglx, shawnguo, s.hauer
Cc: kernel, festevam, dl-linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Kees Cook
Hi Daniel,
> Subject: Re: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable
> with __ro_after_init
>
> On 01/12/2021 13:50, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > sys_ctr_base and cmpcr will not be updated after init, so mark as
> > __ro_after_init.
> >
> > Cc: Kees Cook <keescook@chromium.org>
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > ---
> > drivers/clocksource/timer-imx-sysctr.c | 4 ++--
>
> Applied, thanks
I not see this patch in your tree.
https://git.linaro.org/people/daniel.lezcano/linux.git/log/?h=timers/drivers/next
Thanks,
Peng.
>
>
> --
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init
2021-12-14 8:25 ` Peng Fan
@ 2021-12-14 9:19 ` Daniel Lezcano
0 siblings, 0 replies; 8+ messages in thread
From: Daniel Lezcano @ 2021-12-14 9:19 UTC (permalink / raw)
To: Peng Fan, Peng Fan (OSS), tglx, shawnguo, s.hauer
Cc: kernel, festevam, dl-linux-imx, linux-kernel, linux-arm-kernel,
van.freenix, Kees Cook
On 14/12/2021 09:25, Peng Fan wrote:
> Hi Daniel,
>
>> Subject: Re: [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable
>> with __ro_after_init
>>
>> On 01/12/2021 13:50, Peng Fan (OSS) wrote:
>>> From: Peng Fan <peng.fan@nxp.com>
>>>
>>> sys_ctr_base and cmpcr will not be updated after init, so mark as
>>> __ro_after_init.
>>>
>>> Cc: Kees Cook <keescook@chromium.org>
>>> Signed-off-by: Peng Fan <peng.fan@nxp.com>
>>> ---
>>> drivers/clocksource/timer-imx-sysctr.c | 4 ++--
>>
>> Applied, thanks
>
> I not see this patch in your tree.
> https://git.linaro.org/people/daniel.lezcano/linux.git/log/?h=timers/drivers/next
You should see it now
Thanks
-- Daniel
--
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Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-12-14 9:21 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-12-01 12:50 [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Peng Fan (OSS)
2021-12-01 12:50 ` [PATCH 2/2] clocksource: timer-imx-sysctr: set cpumask to cpu_possible_mask Peng Fan (OSS)
2021-12-02 10:22 ` Daniel Lezcano
2021-12-05 12:53 ` Peng Fan
2021-12-03 0:05 ` [PATCH 1/2] clocksource/drivers/imx-sysctr: mark two variable with __ro_after_init Kees Cook
2021-12-09 13:15 ` Daniel Lezcano
2021-12-14 8:25 ` Peng Fan
2021-12-14 9:19 ` Daniel Lezcano
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