morecore: Fixup HUGETLB_MORECORE semanticsdev-20060913-1

Currently, morecore is enabled, if HUGETLB_MORECORE is set at all in the
environment, even if its value is "no". That is counterintuitive, as
none of the other environment variables work that way. Make
HUGETLB_MORECORE act like HUGETLB_ELFMAP.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/morecore.c b/morecore.c
index 0574a7c..39322a6 100644
--- a/morecore.c
+++ b/morecore.c
@@ -26,6 +26,7 @@
 #include <sys/mman.h>
 #include <errno.h>
 #include <dlfcn.h>
+#include <string.h>
 
 #include "hugetlbfs.h"
 
@@ -134,6 +135,11 @@ static void __attribute__((constructor)) setup_morecore(void)
 	env = getenv("HUGETLB_MORECORE");
 	if (! env)
 		return;
+	if (strcasecmp(env, "no") == 0) {
+		DEBUG("HUGETLB_MORECORE=%s, not setting up morecore\n",
+								env);
+		return;
+	}
 
 	blocksize = gethugepagesize();
 	if (! blocksize) {