mm/damon/paddr: make supported DAMOS actions of paddr clear

Patch series "mm/damon: cleanup code".

DAMON code was not so clean from the beginning, but it has been too much
nowadays, especially due to the duplicates in DAMON_RECLAIM and
DAMON_LRU_SORT.  This patchset cleans some of the mess.


This patch (of 22):

The 'switch-case' statement in 'damon_va_apply_scheme()' function provides
a 'case' for every supported DAMOS action while all not-yet-supported
DAMOS actions fall through the 'default' case, and comment it so that
people can easily know which actions are supported.  Its counterpart in
'paddr', 'damon_pa_apply_scheme()', however, doesn't.  This commit makes
the 'paddr' side function follows the pattern of 'vaddr' for better
readability and consistency.

Link: https://lkml.kernel.org/r/20220913174449.50645-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20220913174449.50645-2-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>