On 24.05.19 г. 18:26 ч., Steven Rostedt wrote:
> On Fri, 24 May 2019 16:11:14 +0100
> Roger Willcocks <roger@xxxxxxxxxxxxxxxx> wrote:
>
>> On 23/05/2019 16:27, Steven Rostedt wrote:
>>>
>>> I haven't yet tested this, but what about something like the following:
>>>
>>> ...perhaps forget about the constant check, and just force
>>> the power of two check:
>>>
>>> \
>>> if (!(__y & (__y >> 1))) { \
>>> __x = round_up(x, y); \
>>> } else { \
>>
>> You probably want
>>
>> if (!(__y & (__y - 1))
>>
>> --
>
> Yes I do. I corrected it in my next email.
>
> http://lkml.kernel.org/r/20190523133648.591f9e78@xxxxxxxxxxxxxxxxxx
Or perhaps just using is_power_of_2 from include/linux/log2.h ?
>
>> #define roundup(x, y) ( \
>> { \
>> typeof(y) __y = y; \
>> typeof(x) __x; \
>> \
>> if (__y & (__y - 1)) \
>> __x = round_up(x, __y); \
>> else \
>> __x = (((x) + (__y - 1)) / __y) * __y; \
>> __x; \
>> })
>
>
> -- Steve
>
