linux-kernel - Re: [PATCH] Lock 7 is cpuidle specific, use non-generic value for locking

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Date:	Thu, 12 Mar 2015 14:56:00 -0600
From:	Lina Iyer <lina.iyer@...aro.org>
To:	Andy Gross <agross@...eaurora.org>
Cc:	bjorn.andersson@...ymobile.com, linux-arm-msm@...r.kernel.org,
	jhugo@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Lock 7 is cpuidle specific, use non-generic value for
 locking

On Thu, Mar 12 2015 at 14:49 -0600, Andy Gross wrote:
>On Thu, Mar 12, 2015 at 01:38:28PM -0600, Lina Iyer wrote:
>
><snip>
>
>>  static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
>>  {
>>  	struct regmap_field *field = lock->priv;
>>  	u32 lock_owner;
>>  	int ret;
>> +	u32 proc_id;
>>
>> -	ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
>> +	proc_id = hwspin_lock_get_id(lock) == QCOM_CPUIDLE_LOCK ?
>> +			QCOM_MUTEX_CPUIDLE_OFFSET + smp_processor_id():
>> +			QCOM_MUTEX_APPS_PROC_ID;
>> +
>> +	ret = regmap_field_write(field, proc_id);
>
>I think I'd rather have a qcom specific function and EXPORT_SYMBOL that to deal
>with this special case.
>
I was going back and forth between a function and inlining this here.
But Stephen just made a good point that this is needed for unlock as
well. A function would be good.


>>  	if (ret)
>>  		return ret;
>>
>> @@ -42,7 +49,7 @@ static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
>>  	if (ret)
>>  		return ret;
>>
>> -	return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
>> +	return lock_owner == proc_id;
>>  }
>>
>>  static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
>> --
>> 2.1.0
>>
>
>-- 
>Qualcomm Innovation Center, Inc.
>The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>a Linux Foundation Collaborative Project
>
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