Re: [PATCH v3 0/2] qspinlock: Introducing a 4-byte queue spinlock

[Waiman Long <waiman.long@hp.com>]

On 02/03/2014 03:51 AM, Raghavendra K T wrote:
> On 01/31/2014 12:19 AM, Raghavendra K T wrote:
>> On 01/30/2014 09:08 PM, Waiman Long wrote:
>>> On 01/30/2014 03:55 AM, Raghavendra K T wrote:
>>>> On 01/28/2014 11:49 PM, Waiman Long wrote:
>> [...]
>>                    from kernel/bounds.c:9:
>>>> include/linux/log2.h: In function ‘__ilog2_u32’:
>>>> include/linux/log2.h:34:2: error: implicit declaration of function
>>>> ‘fls’ [-Werror=implicit-function-declaration]
>>>> include/linux/log2.h: In function ‘__ilog2_u64’:
>>>> include/linux/log2.h:42:2: error: implicit declaration of function
>>>> ‘fls64’ [-Werror=implicit-function-declaration]
>>>> include/linux/log2.h: In function ‘__roundup_pow_of_two’:
>>>> .
>>>> .
>>>> [trimmed]
>>>>
>>>
>>> The code will need to be compiled in either the latest linux tree as 
>>> the
>>> patches have dependency on some new memory barrier that are in 3.14.
>>> Alternatively, you can compile with the latest tip tree.
>>>
>>> If you have already done that, please send me your config file so 
>>> that I
>>> can reproduce the compilation error in my build environment.
>>>
>>
>> I did compile on latest linux tree which had barrier.txt. May be I 'll
>> recheck if I am missing something obvious.
>>
>> Here is .config attached
>
> An Update:
> The reason for failure was that I was compiling for guest. and
> CONFIG_PARAVIRT was enabled.
>
>
>
Thank for the information. I will update my patch to correct that problem.

-Longman