[patch 119/192] misc/sgi-gru/grufault: use vma_lookup() in gru_find_vma()

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From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: misc/sgi-gru/grufault: use vma_lookup() in gru_find_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/20210521174745.2219620-16-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/misc/sgi-gru/grufault.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/misc/sgi-gru/grufault.c~misc-sgi-gru-grufault-use-vma_lookup-in-gru_find_vma
+++ a/drivers/misc/sgi-gru/grufault.c
@@ -49,8 +49,8 @@ struct vm_area_struct *gru_find_vma(unsi
 {
 	struct vm_area_struct *vma;
 
-	vma = find_vma(current->mm, vaddr);
-	if (vma && vma->vm_start <= vaddr && vma->vm_ops == &gru_vm_ops)
+	vma = vma_lookup(current->mm, vaddr);
+	if (vma && vma->vm_ops == &gru_vm_ops)
 		return vma;
 	return NULL;
 }
_



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