Re: [PATCH v12 01/11] bitops: Introduce the for_each_set_clump8 macro

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

 



On Tue, Mar 26, 2019 at 07:08:18PM +0900, William Breathitt Gray wrote:
> On Tue, Mar 26, 2019 at 10:43:45AM +0100, Lukas Wunner wrote:
> > On Tue, Mar 26, 2019 at 12:14:22PM +0900, William Breathitt Gray wrote:

> > Why is it so complicated, does it allow passing in a start value
> > that's not a multiple of 8?  Do you really need that?  I imagine
> > a simplification is possible if that assumption can be made (and
> > is spelled out in the kerneldoc).
> 
> That's a good point. Originally, I had envisioned the possibility of
> calling bitmap_get_value8/bitmap_set_value8 at odd start offsets; this
> would open up the possibility of a clump landing as a split between 2
> words, thus requiring this complicated case handling code. However, I'm
> not sure how often users would need this case; none of the drivers right
> now require clumps at odd offsets.
> 
> Andy, would you have any objection to restricting the start offset
> values for bitmap_get_value8/bitmap_set_value8 to multiples of 8? That
> would prevent the split word case, and thus allow the implementation for
> those functions to be a lot simpler.

No, I have no objection.

-- 
With Best Regards,
Andy Shevchenko





[Index of Archives]     [Linux SPI]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux