linux-kernel - [PATCH] mm: try_to

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Message-Id: <20210704230115.27694-1-rdunlap@infradead.org>
Date:   Sun,  4 Jul 2021 16:01:15 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Yang Shi <shy828301@...il.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] mm: try_to_unmap() is now void

Fix the "CONFIG_MMU is not set" case of converting
try_to_unmap() from bool to void.

In file included from ../mm/vmscan.c:33:
../mm/vmscan.c: In function 'shrink_page_list':
../include/linux/rmap.h:294:34: warning: statement with no effect [-Wunused-value]
  294 | #define try_to_unmap(page, refs) false
      |                                  ^~~~~
../mm/vmscan.c:1508:4: note: in expansion of macro 'try_to_unmap'
 1508 |    try_to_unmap(page, flags);
      |    ^~~~~~~~~~~~

Fixes: 1fb08ac63bee ("mm: rmap: make try_to_unmap() void function")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Yang Shi <shy828301@...il.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 include/linux/rmap.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20210701.orig/include/linux/rmap.h
+++ linux-next-20210701/include/linux/rmap.h
@@ -291,7 +291,7 @@ static inline int page_referenced(struct
 	return 0;
 }
 
-#define try_to_unmap(page, refs) false
+#define try_to_unmap(page, refs) do {} while (0)
 
 static inline int page_mkclean(struct page *page)
 {