mm/secretmem: use a folio in secretmem_fault()

Saves four implicit call to compound_head().

Link: https://lkml.kernel.org/r/20230812062612.3184990-1-zhangpeng362@huawei.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/secretmem.c b/mm/secretmem.c
index 86442a1..3afb5ad 100644 (file)
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -55,6 +55,7 @@ static vm_fault_t secretmem_fault(struct vm_fault *vmf)
        gfp_t gfp = vmf->gfp_mask;
        unsigned long addr;
        struct page *page;
+       struct folio *folio;
        vm_fault_t ret;
        int err;
 
@@ -66,23 +67,24 @@ static vm_fault_t secretmem_fault(struct vm_fault *vmf)
 retry:
        page = find_lock_page(mapping, offset);
        if (!page) {
-               page = alloc_page(gfp | __GFP_ZERO);
-               if (!page) {
+               folio = folio_alloc(gfp | __GFP_ZERO, 0);
+               if (!folio) {
                        ret = VM_FAULT_OOM;
                        goto out;
                }
 
+               page = &folio->page;
                err = set_direct_map_invalid_noflush(page);
                if (err) {
-                       put_page(page);
+                       folio_put(folio);
                        ret = vmf_error(err);
                        goto out;
                }
 
-               __SetPageUptodate(page);
-               err = add_to_page_cache_lru(page, mapping, offset, gfp);
+               __folio_mark_uptodate(folio);
+               err = filemap_add_folio(mapping, folio, offset, gfp);
                if (unlikely(err)) {
-                       put_page(page);
+                       folio_put(folio);
                        /*
                         * If a split of large page was required, it
                         * already happened when we marked the page invalid