lkml.org 
[lkml]   [2018]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2] cpufreq: cppc_cpufreq: Initialize shared cpu's perf capabilities
Date
Hi, Kumar,

On Wed, 2018-04-04 at 16:06 +0530, Viresh Kumar wrote:
> On 04-04-18, 17:16, Shunyong Yang wrote:
> >
> > When multiple cpus are related in one cpufreq policy, the first
> > online
> > cpu will be chosen by default to handle cpufreq operations. Let's
> > take
> > cpu0 and cpu1 as an example.
> >
> > When cpu0 is offline, policy->cpu will be shifted to cpu1. Cpu1's
> > perf
> > capabilities should be initialized. Otherwise, perf capabilities
> > are 0s
> > and speed change can not take effect.
> >
> > This patch copies perf capabilities of the first online cpu to
> > other
> > shared cpus when policy shared type is CPUFREQ_SHARED_TYPE_ANY.
> >
> > Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
> > Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
> > ---
> >
> > Changes in v2:
> >   -Add unlikely in cpu comparison per Kumar's comments.
> >   -Fix coding style per Kumar's comments.
> >
> > Changes in v1:
> >   -Drop RFC tag,
> >      The original RFC link,
> >      https://patchwork.kernel.org/patch/10299055/.
> >
> >      This patch solves same issue as RFC above.
> >
> >      Patch name is changed as code is too much different with RFC
> > above.
> >
> >   -Remove extra init() per Viresh Kumar's comments and only handle
> >    CPPC CPUFREQ_SHARED_TYPE_ANY case.
> >
> > ---
> >  drivers/cpufreq/cppc_cpufreq.c | 15 +++++++++++++--
> >  1 file changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/cpufreq/cppc_cpufreq.c
> > b/drivers/cpufreq/cppc_cpufreq.c
> > index 8f7b21a4d537..679e43b9c980 100644
> > --- a/drivers/cpufreq/cppc_cpufreq.c
> > +++ b/drivers/cpufreq/cppc_cpufreq.c
> > @@ -164,9 +164,20 @@ static int cppc_cpufreq_cpu_init(struct
> > cpufreq_policy *policy)
> >   policy->cpuinfo.transition_latency =
> > cppc_get_transition_latency(cpu_num);
> >   policy->shared_type = cpu->shared_type;
> >  
> > - if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
> > + if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
> > + int i;
> > +
> >   cpumask_copy(policy->cpus, cpu->shared_cpu_map);
> > - else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
> > +
> > + for_each_cpu(i, policy->cpus) {
> > + if (unlikely(i == policy->cpu))
> > + continue;
> > +
> > + memcpy(&all_cpu_data[i]->perf_caps,
> > +        &cpu->perf_caps,
> > +        sizeof(cpu->perf_caps));
> I think this can be written in two lines without violating the 80
> columns rule.

The memcpy() is split in three lines (the three "+"). And I rechecked
it by downloading from

https://patchwork.kernel.org/patch/10322305/

and apply to code. The maximum column number is 59. 
And I re-run checkpatch.pl and it passed.
I am not sure why it is over 80 columns in your tool. 

>
> >
> > + }
> > + } else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL)
> > {
> >   /* Support only SW_ANY for now. */
> >   pr_debug("Unsupported CPU co-ord type\n");
> >   return -EFAULT;
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

Thanks for your ACK.

Thanks.
Shunyong.


>

\
 
 \ /
  Last update: 2018-04-06 03:11    [W:0.079 / U:3.728 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site