smaps: only define clear_refs for CONFIG_MMU

/proc/pid/clear_refs is only defined in the CONFIG_MMU case, so make sure we
don't have any references to clear_refs_smap() in generic procfs code.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3c41149dea88..a5fa1fdafc4e 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -708,6 +708,7 @@ static const struct file_operations proc_oom_adjust_operations = {
         .write          = oom_adjust_write,
 };
 
+#ifdef CONFIG_MMU
 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 {
@@ -741,6 +742,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
 static struct file_operations proc_clear_refs_operations = {
         .write          = clear_refs_write,
 };
+#endif
 
 #ifdef CONFIG_AUDITSYSCALL
 #define TMPBUFLEN 21