[PATCH] sched/fair: Fix assignment of boolean variables

[PATCH] sched/fair: Fix assignment of boolean variables

[Wen Yang]

Fix the following warnings reported by coccinelle:
kernel//sched/fair.c:7958:3-12: WARNING: Assignment of bool to 0/1

This also makes the code more readable.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
CC: Ingo Molnar <mingo@redhat.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: linux-kernel@vger.kernel.org
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a2e8160968cb..f19aa66f9b15 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7955,7 +7955,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
 		if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
 		    sgs->group_misfit_task_load < rq->misfit_task_load) {
 			sgs->group_misfit_task_load = rq->misfit_task_load;
-			*overload = 1;
+			*overload = true;
 		}
 	}
 
-- 
2.19.1

Re: [PATCH] sched/fair: Fix assignment of boolean variables

[Joey Pabalinas]

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On Sat, Dec 01, 2018 at 05:09:36PM +0800, Wen Yang wrote:
> Fix the following warnings reported by coccinelle:
> kernel//sched/fair.c:7958:3-12: WARNING: Assignment of bool to 0/1
> 
> This also makes the code more readable.
> 
> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: Peter Zijlstra <peterz@infradead.org>
> CC: linux-kernel@vger.kernel.org

Ack, earlier assignments in the function like:

	if (nr_running > 1)
		*overload = true;

use `= true`, so this change keeps things consistent.

Reviewed-by: Joey Pabalinas <joeypabalinas@gmail.com>

> ---
>  kernel/sched/fair.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index a2e8160968cb..f19aa66f9b15 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7955,7 +7955,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>  		if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
>  		    sgs->group_misfit_task_load < rq->misfit_task_load) {
>  			sgs->group_misfit_task_load = rq->misfit_task_load;
> -			*overload = 1;
> +			*overload = true;
>  		}
>  	}
>  
> -- 
> 2.19.1
> 

-- 
Cheers,
Joey Pabalinas

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Re: [PATCH] sched/fair: Fix assignment of boolean variables

[Peter Zijlstra]

On Sat, Dec 01, 2018 at 05:09:36PM +0800, Wen Yang wrote:
> Fix the following warnings reported by coccinelle:
> kernel//sched/fair.c:7958:3-12: WARNING: Assignment of bool to 0/1
> 
> This also makes the code more readable.

I disagree; anybody that has trouble with 0/1 vs false/true needs to
stay away from C.

> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: Peter Zijlstra <peterz@infradead.org>
> CC: linux-kernel@vger.kernel.org
> ---
>  kernel/sched/fair.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index a2e8160968cb..f19aa66f9b15 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7955,7 +7955,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>  		if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
>  		    sgs->group_misfit_task_load < rq->misfit_task_load) {
>  			sgs->group_misfit_task_load = rq->misfit_task_load;
> -			*overload = 1;
> +			*overload = true;
>  		}
>  	}
>  

Anyway, this code is going away anyway:

  https://lkml.kernel.org/r/20181119141857.8625-12-quentin.perret@arm.com

Re: [PATCH] sched/fair: Fix assignment of boolean variables

[Valentin Schneider]

On 03/12/2018 08:33, Peter Zijlstra wrote:
> On Sat, Dec 01, 2018 at 05:09:36PM +0800, Wen Yang wrote:
>> Fix the following warnings reported by coccinelle:
>> kernel//sched/fair.c:7958:3-12: WARNING: Assignment of bool to 0/1
>>

Duh, Patrick raised that one to me last week but I got caught up in other
things. I realized I could keep the local 'overload' as bool in

    575638d1047e ("sched/core: Change root_domain->overload type to int")

but probably forgot to update 

    757ffdd705ee ("sched/fair: Set rq->rd->overload when misfit")

accordingly.

>> This also makes the code more readable.
> 
> I disagree; anybody that has trouble with 0/1 vs false/true needs to
> stay away from C.
> 
>> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
>> CC: Ingo Molnar <mingo@redhat.com>
>> CC: Peter Zijlstra <peterz@infradead.org>
>> CC: linux-kernel@vger.kernel.org
>> ---
>>  kernel/sched/fair.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index a2e8160968cb..f19aa66f9b15 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -7955,7 +7955,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>>  		if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
>>  		    sgs->group_misfit_task_load < rq->misfit_task_load) {
>>  			sgs->group_misfit_task_load = rq->misfit_task_load;
>> -			*overload = 1;
>> +			*overload = true;
>>  		}
>>  	}
>>  
> 
> Anyway, this code is going away anyway:
> 
>   https://lkml.kernel.org/r/20181119141857.8625-12-quentin.perret@arm.com
>