linux-kernel - Re: [PATCH 1/6] staging: android: binder: Remove some funny && usage

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Message-ID: <20090619145938.GB1389@ucw.cz>
Date:	Fri, 19 Jun 2009 16:59:38 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Daniel Walker <dwalker@...o99.com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Brian Swetland <swetland@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] staging: android: binder: Remove some funny &&
	usage

>>   	int ret = 0;
>> -	int wait_for_proc_work;
>> +	int wait_for_proc_work = 0;
>>
>>   	if (*consumed == 0) {
>>   		if (put_user(BR_NOOP, (uint32_t __user *)ptr))
>> @@ -2155,8 +2155,8 @@ static int binder_thread_read(struct binder_proc *proc,
>>   	}
>>
>>   retry:
>> -	wait_for_proc_work = thread->transaction_stack == NULL&&
>> -				list_empty(&thread->todo);
>> +	if (list_empty(&thread->todo)&&  thread->transaction_stack == NULL)
>> +		wait_for_proc_work = 1;
>>    
>
> I think the original looks cleaner (in both cases).  Assigning a  
> variable with the result of a boolean expression is perfectly  
> reasonable.  Perhaps change the type of the variable to "bool" to make  
> it a bit clearer what's going on.
>
> (It would be a different matter if any of the expression had side-effects.)

Plus you have broken whitespace in there, changed performance
characteristics (list_empty now done first) and with gotos used around
that code I'm not at all sure transformation is equivalent.
								Pavel

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