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From: Souptick Joarder <jrdr.linux@gmail.com>
To: akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com,
	boris.ostrovsky@oracle.com, jgross@suse.com,
	linux@armlinux.org.uk, robin.murphy@arm.com
Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: [PATCH 9/9] xen/privcmd-buf.c: Convert to use vm_insert_range_buggy
Date: Fri, 11 Jan 2019 20:43:26 +0530
Message-ID: <20190111151326.GA2853@jordon-HP-15-Notebook-PC> (raw)

Convert to use vm_insert_range_buggy() to map range of kernel
memory to user vma.

This driver has ignored vm_pgoff. We could later "fix" these drivers
to behave according to the normal vm_pgoff offsetting simply by
removing the _buggy suffix on the function name and if that causes
regressions, it gives us an easy way to revert.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
---
 drivers/xen/privcmd-buf.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/privcmd-buf.c b/drivers/xen/privcmd-buf.c
index de01a6d..a9d7e97 100644
--- a/drivers/xen/privcmd-buf.c
+++ b/drivers/xen/privcmd-buf.c
@@ -166,12 +166,8 @@ static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
 	if (vma_priv->n_pages != count)
 		ret = -ENOMEM;
 	else
-		for (i = 0; i < vma_priv->n_pages; i++) {
-			ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE,
-					     vma_priv->pages[i]);
-			if (ret)
-				break;
-		}
+		ret = vm_insert_range_buggy(vma, vma_priv->pages,
+						vma_priv->n_pages);
 
 	if (ret)
 		privcmd_buf_vmapriv_free(vma_priv);
-- 
1.9.1


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-11 15:13 Souptick Joarder [this message]
2019-01-14 23:31 ` Boris Ostrovsky
2019-01-15  5:41   ` Souptick Joarder

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