[PATCH 2/9] lib/bitmap: implement bitmap_{empty,full} with bitmap_weight_eq()

[David Laight]

From: Yury Norov
> Sent: 14 December 2021 19:43
...
> 
> I think that for long bitmaps the most time consuming operation is moving
> data to L1, and for short bitmaps the difference between approaches is
> barely measurable.
> 
> But hweght_long on each iteration can't be more effective than the current
> version. So, I'll drop this patch for v2 and keep things unchanged.

Actually do bitmap_full/empty() calls make any sense at all?
The result is stale since bitmaps are designed to do locked operations.
If you have a lock covering the bitmap then you should be using
something that uses non-locked accesses.
Rightly or wrongly that isn't the bitmap api.

	David

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