+ rapidio-use-get_user_pages_unlocked.patch added to -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: rapidio: use get_user_pages_unlocked()
has been added to the -mm tree.  Its filename is
     rapidio-use-get_user_pages_unlocked.patch

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

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------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Subject: rapidio: 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/20170103205024.6704-1-lstoakes@xxxxxxxxx
Signed-off-by: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
Cc: Alexandre Bounine <alexandre.bounine@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/rapidio/devices/rio_mport_cdev.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff -puN drivers/rapidio/devices/rio_mport_cdev.c~rapidio-use-get_user_pages_unlocked drivers/rapidio/devices/rio_mport_cdev.c
--- a/drivers/rapidio/devices/rio_mport_cdev.c~rapidio-use-get_user_pages_unlocked
+++ a/drivers/rapidio/devices/rio_mport_cdev.c
@@ -889,17 +889,16 @@ rio_dma_transfer(struct file *filp, u32
 			goto err_req;
 		}
 
-		down_read(&current->mm->mmap_sem);
-		pinned = get_user_pages(
+		pinned = get_user_pages_unlocked(
 				(unsigned long)xfer->loc_addr & PAGE_MASK,
 				nr_pages,
-				dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
-				page_list, NULL);
-		up_read(&current->mm->mmap_sem);
+				page_list,
+				dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0);
 
 		if (pinned != nr_pages) {
 			if (pinned < 0) {
-				rmcd_error("get_user_pages err=%ld", pinned);
+				rmcd_error("get_user_pages_unlocked err=%ld",
+					   pinned);
 				nr_pages = 0;
 			} else
 				rmcd_error("pinned %ld out of %ld pages",
_

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

rapidio-use-get_user_pages_unlocked.patch

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