[PATCH] shmem: fix compilation warnings on unused functions

["Jérémy Lefaure" <jeremy.lefaure@lse.epita.fr>]

Compiling shmem.c with CONFIG_SHMEM and
CONFIG_TRANSAPRENT_HUGE_PAGECACHE enabled raises warnings on two unused
functions when CONFIG_TMPFS and CONFIG_SYSFS are both disabled:

mm/shmem.c:390:20: warning: a??shmem_format_hugea?? defined but not used
[-Wunused-function]
 static const char *shmem_format_huge(int huge)
                    ^~~~~~~~~~~~~~~~~
mm/shmem.c:373:12: warning: a??shmem_parse_hugea?? defined but not used
[-Wunused-function]
 static int shmem_parse_huge(const char *str)
             ^~~~~~~~~~~~~~~~

A conditional compilation on tmpfs or sysfs removes the warnings.

Signed-off-by: JA(C)rA(C)my Lefaure <jeremy.lefaure@lse.epita.fr>
---
 mm/shmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 2c74186..99595d8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -370,6 +370,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
 
 int shmem_huge __read_mostly;
 
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
 static int shmem_parse_huge(const char *str)
 {
 	if (!strcmp(str, "never"))
@@ -407,6 +408,7 @@ static const char *shmem_format_huge(int huge)
 		return "bad_val";
 	}
 }
+#endif
 
 static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
 		struct shrink_control *sc, unsigned long nr_to_split)
-- 
2.10.2

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