Re: [PATCH v13 01/11] bitops: Introduce the for_each_set_clump8 macro

From: William Breathitt Gray
Date: Thu Mar 28 2019 - 00:29:30 EST

On Wed, Mar 27, 2019 at 07:42:54AM +0100, Lukas Wunner wrote:
> On Wed, Mar 27, 2019 at 01:58:45PM +0900, William Breathitt Gray wrote:
> > This macro iterates for each 8-bit group of bits (clump) with set bits,
> > within a bitmap memory region. For each iteration, "start" is set to the
> > bit offset of the found clump, while the respective clump value is
> > stored to the location pointed by "clump". Additionally, the
> > bitmap_get_value8 and bitmap_set_value8 functions are introduced to
> > respectively get and set an 8-bit value in a bitmap memory region.
> I would have preferred static inlines for bitmap_get_value8(),
> bitmap_set_value8() and find_next_clump8() to make this as fast
> as possible in the callers because I've personally worked with
> an industrial application where the GPIO pins of a 74x164 are
> written every 250 usec.
> But apart from that I like this series a lot, thanks for working on it.
> Lukas

I'm not sure these can be static inline since the symbols are exported
for use outside this file. However, in theory I have no objection from a
performance standpoint. Since my devices don't have such strict realtime
requirements as your 74x164 application, I'll defer this decision to
someone more knowledgeable in this area; perhaps someone else can
comment in this thread with their advice and suggestions.

William Breathitt Gray