[PATCH v1 0/3] mm/ksm: improve PR_SET_MEMORY_MERGE=0 handling and cleanup disabling KSM

[David Hildenbrand <david@redhat.com>]

This is a follow-up to [1]:
	[PATCH v9 0/3] mm: process/cgroup ksm support

which is not in mm-unstable yet (but soon? :) ). I'll be on vacation for
~2 weeks, so sending it out now as reply to [1].

(1) Make PR_SET_MEMORY_MERGE=0 unmerge pages like setting MADV_UNMERGEABLE
does, (2) add a selftest for it and (3) factor out disabling of KSM from
s390/gmap code.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stefan Roesch <shr@devkernel.io>
Cc: Rik van Riel <riel@surriel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>

[1] https://lkml.kernel.org/r/20230418051342.1919757-1-shr@devkernel.io

David Hildenbrand (3):
  mm/ksm: unmerge and clear VM_MERGEABLE when setting
    PR_SET_MEMORY_MERGE=0
  selftests/ksm: ksm_functional_tests: add prctl unmerge test
  mm/ksm: move disabling KSM from s390/gmap code to KSM code

 arch/s390/mm/gmap.c                           | 20 +------
 include/linux/ksm.h                           |  7 +++
 kernel/sys.c                                  |  7 +--
 mm/ksm.c                                      | 58 +++++++++++++++++++
 .../selftests/mm/ksm_functional_tests.c       | 46 +++++++++++++--
 5 files changed, 107 insertions(+), 31 deletions(-)

-- 
2.39.2