linux-kernel - [PATCH V2 4/4] misc: vop: mapping kernel memory to user space as noncached

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Message-Id: <20200929084425.24052-5-sherry.sun@nxp.com>
Date:   Tue, 29 Sep 2020 16:44:25 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     hch@...radead.org, sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        arnd@...db.de, gregkh@...uxfoundation.org, kishon@...com,
        lorenzo.pieralisi@....com
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH V2 4/4] misc: vop: mapping kernel memory to user space as noncached

Mapping kernel space memory to user space as noncached, since user space
need check the updates of avail_idx and device page flags timely.

Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 drivers/misc/mic/vop/vop_vringh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index 4d5feb39aeb7..6e193bd64ef1 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -1057,7 +1057,7 @@ static int vop_mmap(struct file *f, struct vm_area_struct *vma)
 		}
 		err = remap_pfn_range(vma, vma->vm_start + offset,
 				      pa >> PAGE_SHIFT, size,
-				      vma->vm_page_prot);
+				      pgprot_noncached(vma->vm_page_prot));
 		if (err)
 			goto ret;
 		size_rem -= size;
-- 
2.17.1