memory/patcher: fix a compiler warning

Don't define the madvise intercept functions since we're not currently
intercepting madvise.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/memory/patcher/memory_patcher_component.c

@@ -10,7 +10,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2009-2016 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2009-2017 Cisco Systems, Inc.  All rights reserved
  * Copyright (c) 2013-2017 Los Alamos National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2016      Research Organization for Information Science
@@ -59,6 +59,11 @@ static int patcher_query (int *);
 
 static int mca_memory_patcher_priority;
 
+/* NTH: we can't currently allow madvise to be intercepted due to a
+ * deadlock when running with glibc. In the future, we may re-enable
+ * this hook if the deadlock can be resolved. */
+#define WANT_INTERCEPT_MADVISE 0
+
 opal_memory_patcher_component_t mca_memory_patcher_component = {
     .super = {
         .memoryc_version = {
@@ -244,6 +249,7 @@ static void *intercept_mremap (void *start, size_t oldlen, void *new_address, si
 
 #endif
 
+#if WANT_INTERCEPT_MADVISE
 #if defined (SYS_madvise)
 
 static int (*original_madvise) (void *, size_t, int);
@@ -278,6 +284,7 @@ static int intercept_madvise (void *start, size_t length, int advice)
 }
 
 #endif
+#endif // WANT_INTERCEPT_MADVISE
 
 #if defined SYS_brk
 
@@ -496,16 +503,14 @@ static int patcher_open (void)
     }
 #endif
 
-    /* NTH: we can't currently allow madvise to be intercepted due to a deadlock when running with glibc. in
-     * the future we may re-enable this hook if the deadlock can be resolved. */
-#if 0
+#if WANT_INTERCEPT_MADVISE
 #if defined (SYS_madvise)
     rc = opal_patcher->patch_symbol ("madvise", (uintptr_t)intercept_madvise, (uintptr_t *) &original_madvise);
     if (OPAL_SUCCESS != rc) {
         return rc;
     }
 #endif
-#endif
+#endif // WANT_INTERCEPT_MADVISE
 
 #if defined(SYS_shmdt) && defined(__linux__)
     rc = opal_patcher->patch_symbol ("shmdt", (uintptr_t) intercept_shmdt, (uintptr_t *) &original_shmdt);