shmem: convert shmem_read_mapping_page_gfp() to use shmem_get_folio_gfp()

Saves a couple of calls to compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-24-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 154432dc847b7a8335de762cef4c49f9747af8a3..c3e2a65a65fc2fb61dd1ce223910b564eb478255 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4270,18 +4270,20 @@ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
 {
 #ifdef CONFIG_SHMEM
        struct inode *inode = mapping->host;
+       struct folio *folio;
        struct page *page;
        int error;
 
        BUG_ON(!shmem_mapping(mapping));
-       error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE,
+       error = shmem_get_folio_gfp(inode, index, &folio, SGP_CACHE,
                                  gfp, NULL, NULL, NULL);
        if (error)
                return ERR_PTR(error);
 
-       unlock_page(page);
+       folio_unlock(folio);
+       page = folio_file_page(folio, index);
        if (PageHWPoison(page)) {
-               put_page(page);
+               folio_put(folio);
                return ERR_PTR(-EIO);
        }