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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-06-05 23:20:17 -04:00
parent 5816b3e657
commit c25303281d
2 changed files with 3 additions and 3 deletions
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2
include/linux/mm.h
View File

@ -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);
}

4
include/linux/page_ref.h
View File

@ -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);