Re: [KJ] [PATCH] is_power_of_2 in ia64mm

[Andreas Schwab <schwab@suse.de>]

Richard Knutsson <ricknu-0@student.ltu.se> writes:

> Andreas Schwab wrote:
>> Richard Knutsson <ricknu-0@student.ltu.se> writes:
>>
>>   
>>> Vignesh Babu BM wrote:
>>>     
>>>> @@ -175,7 +176,7 @@ static int __init hugetlb_setup_sz(char *str)
>>>>  		tr_pages = 0x15557000UL;
>>>>   	size = memparse(str, &str);
>>>> -	if (*str || (size & (size-1)) || !(tr_pages & size) ||
>>>> +	if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
>>>>  		size <= PAGE_SIZE ||
>>>>  		size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
>>>>  		printk(KERN_WARNING "Invalid huge page size specified\n");
>>>>
>>>>         
>>> As we talked about before; is this really correct? !is_power_of_2(0) ==
>>> true while (0 & (0-1)) == 0.
>>>     
>>
>> size == 0 is also covered by the next two conditions, so the overall value
>> does not change.
>>   
> Yes, but is it meant to state that 'size' is not a power of two?

What else can it mean?

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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