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authorMatthew Wilcox (Oracle) <willy@infradead.org>2023-09-21 23:07:38 +0300
committerJan Kara <jack@suse.cz>2023-10-25 21:19:00 +0300
commit3de6047f1832010d24963f58206298fc75085816 (patch)
tree20ddc0e68e84bd6056c79dd2cc8ed300b53b414b /include/linux/highmem.h
parentbceef326bc87781abb5139898d5f2807881194d9 (diff)
downloadlinux-3de6047f1832010d24963f58206298fc75085816.tar.xz
highmem: Add folio_release_kmap()
This is the folio equivalent of unmap_and_put_page(), which remains as a wrapper for it. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <20230921200746.3303942-1-willy@infradead.org>
Diffstat (limited to 'include/linux/highmem.h')
-rw-r--r--include/linux/highmem.h18
1 files changed, 16 insertions, 2 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 99c474de800d..4cacc0e43b51 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -551,10 +551,24 @@ static inline void folio_zero_range(struct folio *folio,
zero_user_segments(&folio->page, start, start + length, 0, 0);
}
-static inline void unmap_and_put_page(struct page *page, void *addr)
+/**
+ * folio_release_kmap - Unmap a folio and drop a refcount.
+ * @folio: The folio to release.
+ * @addr: The address previously returned by a call to kmap_local_folio().
+ *
+ * It is common, eg in directory handling to kmap a folio. This function
+ * unmaps the folio and drops the refcount that was being held to keep the
+ * folio alive while we accessed it.
+ */
+static inline void folio_release_kmap(struct folio *folio, void *addr)
{
kunmap_local(addr);
- put_page(page);
+ folio_put(folio);
+}
+
+static inline void unmap_and_put_page(struct page *page, void *addr)
+{
+ folio_release_kmap(page_folio(page), addr);
}
#endif /* _LINUX_HIGHMEM_H */