mm: rmap: abstract updating per-node and per-memcg stats

A lot of intricacies go into updating the stats when adding or removing
mappings: which stat index to use and which function.  Abstract this away
into a new static helper in rmap.c, __folio_mod_stat().

This adds an unnecessary call to folio_test_anon() in
__folio_add_anon_rmap() and __folio_add_file_rmap().  However, the folio
struct should already be in the cache at this point, so it shouldn't cause
any noticeable overhead.

No functional change intended.

[[email protected]: fix /proc/meminfo]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yosry Ahmed <[email protected]>
Signed-off-by: Hugh Dickins <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions