[Xen-devel] [PATCH v3 13/41] scif: convert put_page() to put_user_page*()

[john.hubbard@xxxxxxxxx]

From: John Hubbard <jhubbard@xxxxxxxxxx>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
Cc: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 drivers/misc/mic/scif/scif_rma.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c
index 01e27682ea30..d84ed9466920 100644
--- a/drivers/misc/mic/scif/scif_rma.c
+++ b/drivers/misc/mic/scif/scif_rma.c
@@ -113,13 +113,14 @@ static int scif_destroy_pinned_pages(struct 
scif_pinned_pages *pin)
        int writeable = pin->prot & SCIF_PROT_WRITE;
        int kernel = SCIF_MAP_KERNEL & pin->map_flags;
 
-       for (j = 0; j < pin->nr_pages; j++) {
-               if (pin->pages[j] && !kernel) {
+       if (kernel) {
+               for (j = 0; j < pin->nr_pages; j++) {
                        if (writeable)
-                               SetPageDirty(pin->pages[j]);
+                               set_page_dirty_lock(pin->pages[j]);
                        put_page(pin->pages[j]);
                }
-       }
+       } else
+               put_user_pages_dirty_lock(pin->pages, pin->nr_pages, writeable);
 
        scif_free(pin->pages,
                  pin->nr_pages * sizeof(*pin->pages));
@@ -1385,11 +1386,9 @@ int __scif_pin_pages(void *addr, size_t len, int 
*out_prot,
                                if (ulimit)
                                        __scif_dec_pinned_vm_lock(mm, nr_pages);
                                /* Roll back any pinned pages */
-                               for (i = 0; i < pinned_pages->nr_pages; i++) {
-                                       if (pinned_pages->pages[i])
-                                               put_page(
-                                               pinned_pages->pages[i]);
-                               }
+                               put_user_pages(pinned_pages->pages,
+                                              pinned_pages->nr_pages);
+
                                prot &= ~SCIF_PROT_WRITE;
                                try_upgrade = false;
                                goto retry;
-- 
2.22.0


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