Merge patch series "mm: improve write performance with RWF_DONTCACHE"

Jeff Layton <jlayton@kernel.org> says:

This patch series is intended to improve write performance with
RWF_DONTCACHE. This version fixes additional stat accounting issues
found during review: integer promotion on 32-bit, cgroup writeback
domain migration, folio split flag preservation, and a UAF that could
occur in filemap_dontcache_kick_writeback().

* patches from https://patch.msgid.link/20260511-dontcache-v7-0-2848ddce8090@kernel.org:
  mm: kick writeback flusher for IOCB_DONTCACHE with targeted dirty tracking
  mm: track DONTCACHE dirty pages per bdi_writeback
  mm: preserve PG_dropbehind flag during folio split

Link: https://patch.msgid.link/20260511-dontcache-v7-0-2848ddce8090@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>