linux-kernel - Re: [PATCH] sched: Fix compiler warnings

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Date:	Fri, 13 Jun 2014 17:17:23 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] sched: Fix compiler warnings

On 13 June 2014 17:13, Guenter Roeck <linux@...ck-us.net> wrote:
> On 06/13/2014 01:05 AM, Vincent Guittot wrote:
>>
>> Hi Guenter,
>>
>> There are also such kind of function in ARM and powerpc architecture
>>
>> with the additional changes below, you can add my
>> Acked-by Vincent Guittot <vincent.guittot@...aro.org>
>>
>
> I'd prefer to fix those instances with separate patches, since they
> will normally be handled by different maintainers. That simplifies
> acceptance.

Ok.
separate patches is  fine for me too

Vincent

>
> Guenter
>
>
>> Vincent
>>
>> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
>> index 1576d05..7e56b2f 100644
>> --- a/arch/arm/kernel/topology.c
>> +++ b/arch/arm/kernel/topology.c
>> @@ -275,7 +275,7 @@ void store_cpu_topology(unsigned int cpuid)
>>    cpu_topology[cpuid].socket_id, mpidr);
>>   }
>>
>> -static inline const int cpu_corepower_flags(void)
>> +static inline int cpu_corepower_flags(void)
>>   {
>>    return SD_SHARE_PKG_RESOURCES  | SD_SHARE_POWERDOMAIN;
>>   }
>> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
>> index 10ffffe..49d5d4e 100644
>> --- a/arch/powerpc/kernel/smp.c
>> +++ b/arch/powerpc/kernel/smp.c
>> @@ -768,7 +768,7 @@ int setup_profiling_timer(unsigned int multiplier)
>>
>>   #ifdef CONFIG_SCHED_SMT
>>   /* cpumask of CPUs with asymetric SMT dependancy */
>> -static const int powerpc_smt_flags(void)
>> +static int powerpc_smt_flags(void)
>>   {
>>    int flags = SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES;
>>
>>
>> On 13 June 2014 01:08, Guenter Roeck <linux@...ck-us.net> wrote:
>>>
>>> Commit 143e1e28cb (sched: Rework sched_domain topology definition)
>>> introduced a number of functions with a return value of 'const int'.
>>> gcc doesn't know what to do with that and, if the kernel is compiled
>>> with W=1, complains with the following warnings whenever sched.h
>>> is included.
>>>
>>> include/linux/sched.h:875:25: warning:
>>>          type qualifiers ignored on function return type
>>> include/linux/sched.h:882:25: warning:
>>>          type qualifiers ignored on function return type
>>> include/linux/sched.h:889:25: warning:
>>>          type qualifiers ignored on function return type
>>> include/linux/sched.h:1002:21: warning:
>>>          type qualifiers ignored on function return type
>>>
>>> Drop 'const' from the function declarations to fix the problem.
>>>
>>> Cc: Vincent Guittot <vincent.guittot@...aro.org>
>>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>>> ---
>>>   include/linux/sched.h | 8 ++++----
>>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/include/linux/sched.h b/include/linux/sched.h
>>> index ea74596..65046b3 100644
>>> --- a/include/linux/sched.h
>>> +++ b/include/linux/sched.h
>>> @@ -872,21 +872,21 @@ enum cpu_idle_type {
>>>   #define SD_NUMA                        0x4000  /* cross-node balancing
>>> */
>>>
>>>   #ifdef CONFIG_SCHED_SMT
>>> -static inline const int cpu_smt_flags(void)
>>> +static inline int cpu_smt_flags(void)
>>>   {
>>>          return SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES;
>>>   }
>>>   #endif
>>>
>>>   #ifdef CONFIG_SCHED_MC
>>> -static inline const int cpu_core_flags(void)
>>> +static inline int cpu_core_flags(void)
>>>   {
>>>          return SD_SHARE_PKG_RESOURCES;
>>>   }
>>>   #endif
>>>
>>>   #ifdef CONFIG_NUMA
>>> -static inline const int cpu_numa_flags(void)
>>> +static inline int cpu_numa_flags(void)
>>>   {
>>>          return SD_NUMA;
>>>   }
>>> @@ -999,7 +999,7 @@ void free_sched_domains(cpumask_var_t doms[],
>>> unsigned int ndoms);
>>>   bool cpus_share_cache(int this_cpu, int that_cpu);
>>>
>>>   typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
>>> -typedef const int (*sched_domain_flags_f)(void);
>>> +typedef int (*sched_domain_flags_f)(void);
>>>
>>>   #define SDTL_OVERLAP   0x01
>>>
>>> --
>>> 1.9.1
>>>
>>
>>
>
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