linux-kernel - [PATCH v8 20/70] xen: use vma_lookup() in privcmd_ioctl

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Message-ID: <20220426150616.3937571-21-Liam.Howlett@oracle.com>
Date:   Tue, 26 Apr 2022 15:06:34 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>
Subject: [PATCH v8 20/70] xen: use vma_lookup() in privcmd_ioctl_mmap()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

vma_lookup() walks the VMA tree for a specific value, find_vma() will
search the tree after walking to a specific value.  It is more efficient
to only walk to the requested value since privcmd_ioctl_mmap() will exit
the loop if vm_start != msg->va.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
 drivers/xen/privcmd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 3369734108af..ad17166b0ef6 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -282,7 +282,7 @@ static long privcmd_ioctl_mmap(struct file *file, void __user *udata)
 						     struct page, lru);
 		struct privcmd_mmap_entry *msg = page_address(page);
 
-		vma = find_vma(mm, msg->va);
+		vma = vma_lookup(mm, msg->va);
 		rc = -EINVAL;
 
 		if (!vma || (msg->va != vma->vm_start) || vma->vm_private_data)
-- 
2.35.1