mm: do not use double negation for testing page flags
With the discussion[1], I found it seems there are every PageFlags
functions return bool at this moment so we don't need double negation
any more. Although it's not a problem to keep it, it makes future users
confused to use double negation for them, too.
Remove such possibility.
[1] https://marc.info/?l=linux-kernel&m=148881578820434
Frankly sepaking, I like every PageFlags to return bool instead of int.
It will make it clear. AFAIR, Chen Gang had tried it but don't know why
it was not merged at that time.
http://lkml.kernel.org/r/1469336184-1904-1-git-send-email-chengang@emindsoft.com.cn
Link: http://lkml.kernel.org/r/1488868597-32222-1-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Chen Gang <gang.chen.5i5j@gmail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 88e4b17..7cb9c88 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -548,7 +548,7 @@
* The page must only be referenced by the scanned process
* and page swap cache.
*/
- if (page_count(page) != 1 + !!PageSwapCache(page)) {
+ if (page_count(page) != 1 + PageSwapCache(page)) {
unlock_page(page);
result = SCAN_PAGE_COUNT;
goto out;
@@ -1181,7 +1181,7 @@
* The page must only be referenced by the scanned process
* and page swap cache.
*/
- if (page_count(page) != 1 + !!PageSwapCache(page)) {
+ if (page_count(page) != 1 + PageSwapCache(page)) {
result = SCAN_PAGE_COUNT;
goto out_unmap;
}