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mm/ksm: use vma_lookup() in find_mergeable_vma() 

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Link: https://lkml.kernel.org/r/20210521174745.2219620-19-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam Howlett 2021-06-28 19:39:41 -07:00 committed by Linus Torvalds
parent 46e6b31d46
commit ff69fb8100
1 changed files with 2 additions and 4 deletions
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6
mm/ksm.c
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@ -521,10 +521,8 @@ static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
struct vm_area_struct *vma;
if (ksm_test_exit(mm))
return NULL;
vma = find_vma(mm, addr);
if (!vma || vma->vm_start > addr)
return NULL;
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
vma = vma_lookup(mm, addr);
if (!vma || !(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
return NULL;
return vma;
}