mm: Convert get_page_unless_zero() to return bool

atomic_add_unless() returns bool, so remove the widening casts to int
in page_ref_add_unless() and get_page_unless_zero().  This causes gcc
to produce slightly larger code in isolate_migratepages_block(), but
it's not clear that it's worse code.  Net +19 bytes of text.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 73a52ab..1de8864 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -754,7 +754,7 @@ static inline int put_page_testzero(struct page *page)
  * This can be called when MMU is off so it must not access
  * any of the virtual mappings.
  */
-static inline int get_page_unless_zero(struct page *page)
+static inline bool get_page_unless_zero(struct page *page)
 {
        return page_ref_add_unless(page, 1, 0);
 }

diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index 7ad46f4..3a799de 100644 (file)
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -161,9 +161,9 @@ static inline int page_ref_dec_return(struct page *page)
        return ret;
 }
 
-static inline int page_ref_add_unless(struct page *page, int nr, int u)
+static inline bool page_ref_add_unless(struct page *page, int nr, int u)
 {
-       int ret = atomic_add_unless(&page->_refcount, nr, u);
+       bool ret = atomic_add_unless(&page->_refcount, nr, u);
 
        if (page_ref_tracepoint_active(page_ref_mod_unless))
                __page_ref_mod_unless(page, nr, ret);