+ drivers-virt-use-get_user_pages_unlocked.patch added to -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: drivers/virt/fsl_hypervisor.c: use get_user_pages_unlocked()
has been added to the -mm tree.  Its filename is
     drivers-virt-use-get_user_pages_unlocked.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/drivers-virt-use-get_user_pages_unlocked.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/drivers-virt-use-get_user_pages_unlocked.patch

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------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Subject: drivers/virt/fsl_hypervisor.c: use get_user_pages_unlocked()

Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.

Link: http://lkml.kernel.org/r/20161101194332.23961-1-lstoakes@xxxxxxxxx
Signed-off-by: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
Cc: Mihai Caraman <mihai.caraman@xxxxxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/virt/fsl_hypervisor.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff -puN drivers/virt/fsl_hypervisor.c~drivers-virt-use-get_user_pages_unlocked drivers/virt/fsl_hypervisor.c
--- a/drivers/virt/fsl_hypervisor.c~drivers-virt-use-get_user_pages_unlocked
+++ a/drivers/virt/fsl_hypervisor.c
@@ -243,11 +243,8 @@ static long ioctl_memcpy(struct fsl_hv_i
 	sg_list = PTR_ALIGN(sg_list_unaligned, sizeof(struct fh_sg_list));
 
 	/* Get the physical addresses of the source buffer */
-	down_read(&current->mm->mmap_sem);
-	num_pinned = get_user_pages(param.local_vaddr - lb_offset,
-		num_pages, (param.source == -1) ? 0 : FOLL_WRITE,
-		pages, NULL);
-	up_read(&current->mm->mmap_sem);
+	num_pinned = get_user_pages_unlocked(param.local_vaddr - lb_offset,
+		num_pages, pages, (param.source == -1) ? 0 : FOLL_WRITE);
 
 	if (num_pinned != num_pages) {
 		/* get_user_pages() failed */
_

Patches currently in -mm which might be from lstoakes@xxxxxxxxx are

drivers-virt-use-get_user_pages_unlocked.patch

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