Subject: [PATCH] perf: Use pre-empt safe cpu_get/put insted of smp_processor_id

From: [email-masked] (Kevin Hilman)
Date: Fri, 07 Sep 2012 14:50:32 -0700

Roger Quadros <[email-masked]> writes:

> Hi Jean,
>
> My bad, I didn't follow up with this. My guess is that it has not been
> picked up. Tony, Kevin?
>

Wasn't picked up by me (but should've been, sorry.)  Care to refresh
against v3.6-rc4 and resend?

Thanks,

Kevin

>
> On 09/06/2012 09:59 PM, Jean Pihet wrote:
>> Fixed Paul's email address
>> 
>> On Thu, Sep 6, 2012 at 8:56 PM, Jean Pihet <[email-masked]> wrote:
>>> Hi Roger,
>>>
>>> On Fri, Aug 10, 2012 at 4:05 PM, Roger Quadros <[email-masked]> wrote:
>>>> gets rid of below messages with CONFIG_DEBUG_PREEMPT enabled
>>>>
>>>> [   28.832916] debug_smp_processor_id: 18 callbacks suppressed
>>>> [   28.832946] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/1763
>>>> [   28.841491] caller is pwrdm_set_next_pwrst+0x54/0x120
>>>>
>>>> Signed-off-by: Roger Quadros <[email-masked]>
>>>
>>> What his the status of the patch? Has it been reviewed and taken in an
>>> integration tree? I cannot find anything about it in l-o and
>>> linux-next.
>>>
>>> I have some changes on-going in the OMAP PM code and I would like to
>>> know if $SUBJECT is applicable.
>>>
>>> Regards,
>>> Jean
>>>
>>>> ---
>>>>  arch/arm/mach-omap2/clock.c       |    9 ++++++---
>>>>  arch/arm/mach-omap2/pm34xx.c      |   12 ++++++++----
>>>>  arch/arm/mach-omap2/powerdomain.c |    6 ++++--
>>>>  3 files changed, 18 insertions(+), 9 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
>>>> index ea3f565..06747b6 100644
>>>> --- a/arch/arm/mach-omap2/clock.c
>>>> +++ b/arch/arm/mach-omap2/clock.c
>>>> @@ -285,7 +285,8 @@ void omap2_clk_disable(struct clk *clk)
>>>>         pr_debug("clock: %s: disabling in hardware\n", clk->name);
>>>>
>>>>         if (clk->ops && clk->ops->disable) {
>>>> -               trace_clock_disable(clk->name, 0, smp_processor_id());
>>>> +               trace_clock_disable(clk->name, 0, get_cpu());
>>>> +               put_cpu();
>>>>                 clk->ops->disable(clk);
>>>>         }
>>>>
>>>> @@ -339,7 +340,8 @@ int omap2_clk_enable(struct clk *clk)
>>>>         }
>>>>
>>>>         if (clk->ops && clk->ops->enable) {
>>>> -               trace_clock_enable(clk->name, 1, smp_processor_id());
>>>> +               trace_clock_enable(clk->name, 1, get_cpu());
>>>> +               put_cpu();
>>>>                 ret = clk->ops->enable(clk);
>>>>                 if (ret) {
>>>>                         WARN(1, "clock: %s: could not enable: %d\n",
>>>> @@ -380,7 +382,8 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
>>>>
>>>>         /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
>>>>         if (clk->set_rate) {
>>>> -               trace_clock_set_rate(clk->name, rate, smp_processor_id());
>>>> +               trace_clock_set_rate(clk->name, rate, get_cpu());
>>>> +               put_cpu();
>>>>                 ret = clk->set_rate(clk, rate);
>>>>         }
>>>>
>>>> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
>>>> index e4fc88c..81fec2e 100644
>>>> --- a/arch/arm/mach-omap2/pm34xx.c
>>>> +++ b/arch/arm/mach-omap2/pm34xx.c
>>>> @@ -357,18 +357,22 @@ void omap_sram_idle(void)
>>>>
>>>>  static void omap3_pm_idle(void)
>>>>  {
>>>> +       unsigned cpu;
>>>> +
>>>>         local_fiq_disable();
>>>>
>>>>         if (omap_irq_pending())
>>>>                 goto out;
>>>>
>>>> -       trace_power_start(POWER_CSTATE, 1, smp_processor_id());
>>>> -       trace_cpu_idle(1, smp_processor_id());
>>>> +       cpu = get_cpu();
>>>> +       trace_power_start(POWER_CSTATE, 1, cpu);
>>>> +       trace_cpu_idle(1, cpu);
>>>>
>>>>         omap_sram_idle();
>>>>
>>>> -       trace_power_end(smp_processor_id());
>>>> -       trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
>>>> +       trace_power_end(cpu);
>>>> +       trace_cpu_idle(PWR_EVENT_EXIT, cpu);
>>>> +       put_cpu();
>>>>
>>>>  out:
>>>>         local_fiq_enable();
>>>> diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
>>>> index 69b36e1..138bf86 100644
>>>> --- a/arch/arm/mach-omap2/powerdomain.c
>>>> +++ b/arch/arm/mach-omap2/powerdomain.c
>>>> @@ -169,7 +169,8 @@ static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
>>>>                                        ((state & OMAP_POWERSTATE_MASK) << 8) |
>>>>                                        ((prev & OMAP_POWERSTATE_MASK) << 0));
>>>>                         trace_power_domain_target(pwrdm->name, trace_state,
>>>> -                                                 smp_processor_id());
>>>> +                                                 get_cpu());
>>>> +                       put_cpu();
>>>>                 }
>>>>                 break;
>>>>         default:
>>>> @@ -491,7 +492,8 @@ int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
>>>>         if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
>>>>                 /* Trace the pwrdm desired target state */
>>>>                 trace_power_domain_target(pwrdm->name, pwrst,
>>>> -                                         smp_processor_id());
>>>> +                                         get_cpu());
>>>> +               put_cpu();
>>>>                 /* Program the pwrdm desired target state */
>>>>                 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
>>>>         }
>>>> --
>>>> 1.7.4.1
>>>>
>
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