[src/trunk]: src/sys/kern Push/Pop pragma magic to avoid gcc warning aber a l...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f39ecb2d2068
branches:  trunk
changeset: 789997:f39ecb2d2068
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Sep 14 20:46:27 2013 +0000

description:
Push/Pop pragma magic to avoid gcc warning aber a less-than NULL comparision

diffstat:

 sys/kern/kern_ras.c |  15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diffs (46 lines):

diff -r bf327d96d7b1 -r f39ecb2d2068 sys/kern/kern_ras.c
--- a/sys/kern/kern_ras.c       Sat Sep 14 20:29:54 2013 +0000
+++ b/sys/kern/kern_ras.c       Sat Sep 14 20:46:27 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_ras.c,v 1.35 2012/02/19 21:06:53 rmind Exp $      */
+/*     $NetBSD: kern_ras.c,v 1.36 2013/09/14 20:46:27 martin Exp $     */
 
 /*-
  * Copyright (c) 2002, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_ras.c,v 1.35 2012/02/19 21:06:53 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_ras.c,v 1.36 2013/09/14 20:46:27 martin Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -176,6 +176,14 @@
 
 #if defined(__HAVE_RAS)
 
+#if __GNUC_PREREQ__(4, 8)
+#define        __WARNING_PUSH_LESS_NULL_PTR    _Pragma("GCC diagnostic push")  _Pragma("GCC diagnostic ignored \"-Wextra\"")
+#define        __WARNING_POP_LESS_NULL_PTR     _Pragma("GCC diagnostic pop")
+#else
+#define        __WARNING_PUSH_LESS_NULL_PTR
+#define        __WARNING_POP_LESS_NULL_PTR
+#endif
+
 /*
  * Install the new sequence.  If it already exists, return
  * an error.
@@ -191,9 +199,12 @@
 
        endaddr = (char *)addr + len;
 
+       /* do not warn about < NULL pointer comparision */
+       __WARNING_PUSH_LESS_NULL_PTR
        if (addr < (void *)VM_MIN_ADDRESS ||
            endaddr > (void *)VM_MAXUSER_ADDRESS)
                return (EINVAL);
+       __WARNING_POP_LESS_NULL_PTR
 
        if (len <= 0)
                return (EINVAL);