Why don't we have atomic_set_mask()?

[Russell King - ARM Linux]

On Thu, Mar 17, 2011 at 08:36:15PM +0900, KyongHo Cho wrote:
> arch/arm/asm/atomic.h defines atomic_clear_mask() but its counterpart,
> atomic_set_mask() is not defined.

Nothing other than some s390 drivers seems to use it, so I'd say no.
I also feel that atomic_xxx() is over-used, many times in inappropriate
and buggy ways.

If you want to manipulate bitmasks or bitmaps, then imho you should be
using the bitops or bitmap support rather than atomic stuff.