prctl: check -- Try new interface as well

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -169,6 +169,7 @@ static int check_prctl(void)
 {
 	unsigned long user_auxv = 0;
 	unsigned int *tid_addr;
+	unsigned int size = 0;
 	int ret;
 
 	ret = sys_prctl(PR_GET_TID_ADDRESS, (unsigned long)&tid_addr, 0, 0, 0);
@@ -177,6 +178,12 @@ static int check_prctl(void)
 		return -1;
 	}
 
+	/*
+	 * Either new or old interface must be supported in the kernel.
+	 */
+	ret = sys_prctl(PR_SET_MM, PR_SET_MM_MAP_SIZE, (unsigned long)&size, 0, 0);
+	if (ret) {
+
 		ret = sys_prctl(PR_SET_MM, PR_SET_MM_BRK, sys_brk(0), 0, 0);
 		if (ret) {
 			if (ret == -EPERM)
@@ -197,6 +204,7 @@ static int check_prctl(void)
 			pr_msg("prctl: PR_SET_MM_AUXV is not supported\n");
 			return -1;
 		}
+	}
 
 	return 0;
 }