diff options
| author | David Hildenbrand <david@redhat.com> | 2023-04-22 23:01:56 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-05-02 17:21:50 -0700 |
| commit | 2c281f54f556e1f3266c8cb104adf9eea7a7b742 (patch) | |
| tree | b8884396dc61d0aa9851999d3443644c09806002 /include | |
| parent | 1150ea9338554ee6685c9f8939cf7202bf5b27cf (diff) | |
| download | lwn-2c281f54f556e1f3266c8cb104adf9eea7a7b742.tar.gz lwn-2c281f54f556e1f3266c8cb104adf9eea7a7b742.zip | |
mm/ksm: move disabling KSM from s390/gmap code to KSM code
Let's factor out actual disabling of KSM. The existing "mm->def_flags &=
~VM_MERGEABLE;" was essentially a NOP and can be dropped, because
def_flags should never include VM_MERGEABLE. Note that we don't currently
prevent re-enabling KSM.
This should now be faster in case KSM was never enabled, because we only
conditionally iterate all VMAs. Further, it certainly looks cleaner.
Link: https://lkml.kernel.org/r/20230422210156.33630-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Stefan Roesch <shr@devkernel.io>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ksm.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ksm.h b/include/linux/ksm.h index 429efa6ff4ae..899a314bc487 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -22,6 +22,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start, void ksm_add_vma(struct vm_area_struct *vma); int ksm_enable_merge_any(struct mm_struct *mm); int ksm_disable_merge_any(struct mm_struct *mm); +int ksm_disable(struct mm_struct *mm); int __ksm_enter(struct mm_struct *mm); void __ksm_exit(struct mm_struct *mm); @@ -80,6 +81,11 @@ static inline void ksm_add_vma(struct vm_area_struct *vma) { } +static inline int ksm_disable(struct mm_struct *mm) +{ + return 0; +} + static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) { return 0; |