linux-kernel - [PATCH] mm: add prototype for __add_to_page_cache

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Date:   Tue, 22 Dec 2020 19:49:52 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Souptick Joarder <jrdr.linux@...il.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>
Subject: [PATCH] mm: add prototype for __add_to_page_cache_locked()

Otherwise it cause gcc warning:
          ^~~~~~~~~~~~~~~
../mm/filemap.c:830:14: warning: no previous prototype for
‘__add_to_page_cache_locked’ [-Wmissing-prototypes]
 noinline int __add_to_page_cache_locked(struct page *page,
              ^~~~~~~~~~~~~~~~~~~~~~~~~~

A previous attempt to make this function static leads to
compile error for few architectures.

Adding a prototype will silence the warning.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Cc: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 include/linux/mm.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5299b90a..ac07f65 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -216,6 +216,12 @@ int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *,
 		loff_t *);
 int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
 		loff_t *);
+/*
+ * Any attempt to mark this function as static leads to build failure
+ * for few architectures. Adding a prototype to silence gcc warning.
+ */
+int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
+		pgoff_t offset, gfp_t gfp, void **shadowp);
 
 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
 
-- 
1.9.1