From 3d88936f35bc67f7bee2efd4eec69baf26c17a5a Mon Sep 17 00:00:00 2001
From: Lorenzo Stoakes <lstoakes@gmail.com>
Date: Mon, 8 May 2017 15:55:02 -0700
Subject: [PATCH] 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@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Mihai Caraman <mihai.caraman@freescale.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
drivers/virt/fsl_hypervisor.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 150ce2abf6c8f..d3eca879a0a85 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -243,11 +243,8 @@ static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
sg_list = PTR_ALIGN(sg_list_unaligned, sizeof(struct fh_sg_list));
/* Get the physical addresses of the source buffer */
- down_read(¤t->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(¤t->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 */
--
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