Re: [PATCH v2 2/2] spi: add SPI controller driver for UniPhier SoC

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Jul 30, 2018 at 8:30 AM, Keiji Hayashibara
<hayashibara.keiji@xxxxxxxxxxxxx> wrote:
> Hello Trent and Andy,

>> > > +       ckrat = roundup(ckrat, 2);
>> >
>> > ckrat += ckrat & 1;
>>
>> Either way, the compiler produces the same code:
>>
>>  add r0, r0, #1
>>  bic r0, r0, #1
>>
>> I.e., ckrat = (ckrat + 1) & ~1, one "add" and one "and".
>>
>> Might as well use the macro so it's clear. There is also round_up(x,y), which I believe is intended to be used
>> only with power of 2 values of y.
>
> I confirmed round_up() macro.
> This macro is optimized to power of 2 argument,
> and it matches to this case and clear.
>
> I will replace to round_up() macro.

Good!


-- 
With Best Regards,
Andy Shevchenko
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux