Messages in this thread Patch in this message | | | From | Sherry Sun <> | Subject | [PATCH V2 4/4] misc: vop: mapping kernel memory to user space as noncached | Date | Tue, 29 Sep 2020 16:44:25 +0800 |
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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@nxp.com> Signed-off-by: Sherry Sun <sherry.sun@nxp.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
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