linux-kernel - [PATCH v2 15/22] misc/sgi-gru/grufault: Use vma_lookup() in gru_find

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Date:   Fri, 21 May 2021 17:48:04 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Davidlohr Bueso <dbueso@...e.de>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH v2 15/22] 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.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Reviewed-by: Laurent Dufour <ldufour@...ux.ibm.com>
Acked-by: David Hildenbrand <david@...hat.com>
Acked-by: Davidlohr Bueso <dbueso@...e.de>
---
 drivers/misc/sgi-gru/grufault.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 723825524ea0..d7ef61e602ed 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -49,8 +49,8 @@ struct vm_area_struct *gru_find_vma(unsigned long vaddr)
 {
 	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;
 }
-- 
2.30.2