[PATCH v10 20/25] powerpc: book3s64: convert to pin_user_pages() and put_user_page()

[John Hubbard]

1. Convert from get_user_pages() to pin_user_pages().

2. As required by pin_user_pages(), release these pages via
put_user_page().

Reviewed-by: Jan Kara <j...@suse.cz>
Signed-off-by: John Hubbard <jhubb...@nvidia.com>
---
 arch/powerpc/mm/book3s64/iommu_api.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/iommu_api.c 
b/arch/powerpc/mm/book3s64/iommu_api.c
index 56cc84520577..a86547822034 100644
--- a/arch/powerpc/mm/book3s64/iommu_api.c
+++ b/arch/powerpc/mm/book3s64/iommu_api.c
@@ -103,7 +103,7 @@ static long mm_iommu_do_alloc(struct mm_struct *mm, 
unsigned long ua,
        for (entry = 0; entry < entries; entry += chunk) {
                unsigned long n = min(entries - entry, chunk);
 
-               ret = get_user_pages(ua + (entry << PAGE_SHIFT), n,
+               ret = pin_user_pages(ua + (entry << PAGE_SHIFT), n,
                                FOLL_WRITE | FOLL_LONGTERM,
                                mem->hpages + entry, NULL);
                if (ret == n) {
@@ -167,9 +167,8 @@ static long mm_iommu_do_alloc(struct mm_struct *mm, 
unsigned long ua,
        return 0;
 
 free_exit:
-       /* free the reference taken */
-       for (i = 0; i < pinned; i++)
-               put_page(mem->hpages[i]);
+       /* free the references taken */
+       put_user_pages(mem->hpages, pinned);
 
        vfree(mem->hpas);
        kfree(mem);
@@ -215,7 +214,8 @@ static void mm_iommu_unpin(struct 
mm_iommu_table_group_mem_t *mem)
                if (mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY)
                        SetPageDirty(page);
 
-               put_page(page);
+               put_user_page(page);
+
                mem->hpas[i] = 0;
        }
 }
-- 
2.24.0