linux-kernel - [PATCH] thp: fix unused shmem_parse

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Date:   Fri, 12 Jul 2019 11:11:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] thp: fix unused shmem_parse_huge() function warning

When CONFIG_SYSFS is disabled but CONFIG_TMPFS is enabled, we get a warning
about shmem_parse_huge() never being called:

mm/shmem.c:417:12: error: unused function 'shmem_parse_huge' [-Werror,-Wunused-function]
static int shmem_parse_huge(const char *str)

Change the #ifdef so we no longer build this function in that configuration.

Fixes: 144df3b288c4 ("vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/shmem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index ba40fac908c5..32aa9d46b87c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -413,7 +413,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
 
 static int shmem_huge __read_mostly;
 
-#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
+#if defined(CONFIG_SYSFS)
 static int shmem_parse_huge(const char *str)
 {
 	if (!strcmp(str, "never"))
@@ -430,7 +430,9 @@ static int shmem_parse_huge(const char *str)
 		return SHMEM_HUGE_FORCE;
 	return -EINVAL;
 }
+#endif
 
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
 static const char *shmem_format_huge(int huge)
 {
 	switch (huge) {
-- 
2.20.0