The quilt patch titled
Subject: mm: replace vma->vm_flags indirect modification in ksm_madvise
has been removed from the -mm tree. Its filename was
mm-replace-vma-vm_flags-indirect-modification-in-ksm_madvise.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: replace vma->vm_flags indirect modification in ksm_madvise
Date: Thu, 26 Jan 2023 11:37:50 -0800
Replace indirect modifications to vma->vm_flags with calls to modifier
functions to be able to track flag changes and to keep vma locking
correctness.
Link: https://lkml.kernel.org/r/20230126193752.297968-6-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> [powerpc]
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arjun Roy <arjunroy@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Joel Fernandes <joelaf@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Peter Oskolkov <posk@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Punit Agrawal <punit.agrawal@xxxxxxxxxxxxx>
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Soheil Hassas Yeganeh <soheil@xxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kvm/book3s_hv_uvmem.c | 6 +++++-
arch/s390/mm/gmap.c | 6 +++++-
2 files changed, 10 insertions(+), 2 deletions(-)
--- a/arch/powerpc/kvm/book3s_hv_uvmem.c~mm-replace-vma-vm_flags-indirect-modification-in-ksm_madvise
+++ a/arch/powerpc/kvm/book3s_hv_uvmem.c
@@ -393,6 +393,7 @@ static int kvmppc_memslot_page_merge(str
{
unsigned long gfn = memslot->base_gfn;
unsigned long end, start = gfn_to_hva(kvm, gfn);
+ unsigned long vm_flags;
int ret = 0;
struct vm_area_struct *vma;
int merge_flag = (merge) ? MADV_MERGEABLE : MADV_UNMERGEABLE;
@@ -409,12 +410,15 @@ static int kvmppc_memslot_page_merge(str
ret = H_STATE;
break;
}
+ /* Copy vm_flags to avoid partial modifications in ksm_madvise */
+ vm_flags = vma->vm_flags;
ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
- merge_flag, &vma->vm_flags);
+ merge_flag, &vm_flags);
if (ret) {
ret = H_STATE;
break;
}
+ vm_flags_reset(vma, vm_flags);
start = vma->vm_end;
} while (end > vma->vm_end);
--- a/arch/s390/mm/gmap.c~mm-replace-vma-vm_flags-indirect-modification-in-ksm_madvise
+++ a/arch/s390/mm/gmap.c
@@ -2587,14 +2587,18 @@ int gmap_mark_unmergeable(void)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
+ unsigned long vm_flags;
int ret;
VMA_ITERATOR(vmi, mm, 0);
for_each_vma(vmi, vma) {
+ /* Copy vm_flags to avoid partial modifications in ksm_madvise */
+ vm_flags = vma->vm_flags;
ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
- MADV_UNMERGEABLE, &vma->vm_flags);
+ MADV_UNMERGEABLE, &vm_flags);
if (ret)
return ret;
+ vm_flags_reset(vma, vm_flags);
}
mm->def_flags &= ~VM_MERGEABLE;
return 0;
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
