[src/trunk]: src/sys/dev/tc add __USE() for unused volatile variables, so tha...

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

details:   https://anonhg.NetBSD.org/src/rev/40e98f749727
branches:  trunk
changeset: 791085:40e98f749727
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Nov 04 16:53:09 2013 +0000

description:
add __USE() for unused volatile variables, so that we generate the same code.

diffstat:

 sys/dev/tc/mfb.c |  6 ++++--
 sys/dev/tc/px.c  |  5 +++--
 sys/dev/tc/pxg.c |  5 +++--
 3 files changed, 10 insertions(+), 6 deletions(-)

diffs (86 lines):

diff -r 4ec36f6db68f -r 40e98f749727 sys/dev/tc/mfb.c
--- a/sys/dev/tc/mfb.c  Mon Nov 04 16:52:08 2013 +0000
+++ b/sys/dev/tc/mfb.c  Mon Nov 04 16:53:09 2013 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: mfb.c,v 1.58 2012/01/11 21:12:36 macallan Exp $ */
+/* $NetBSD: mfb.c,v 1.59 2013/11/04 16:53:09 christos Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mfb.c,v 1.58 2012/01/11 21:12:36 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mfb.c,v 1.59 2013/11/04 16:53:09 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -260,6 +260,7 @@
        /* clear any pending interrupts */
        *(uint8_t *)((char *)ri->ri_hw + MX_IREQ_OFFSET) = 0;
        junk = *(uint8_t *)((char *)ri->ri_hw + MX_IREQ_OFFSET);
+       __USE(junk);
        *(uint8_t *)((char *)ri->ri_hw + MX_IREQ_OFFSET) = 1;
 
        waa.console = console;
@@ -471,6 +472,7 @@
 
        base = (void *)sc->sc_ri->ri_hw;
        junk = *(uint8_t *)(base + MX_IREQ_OFFSET);
+       __USE(junk);
 #if 0
        *(uint8_t *)(base + MX_IREQ_OFFSET) = 0;
 #endif
diff -r 4ec36f6db68f -r 40e98f749727 sys/dev/tc/px.c
--- a/sys/dev/tc/px.c   Mon Nov 04 16:52:08 2013 +0000
+++ b/sys/dev/tc/px.c   Mon Nov 04 16:53:09 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: px.c,v 1.39 2012/10/27 17:18:38 chs Exp $      */
+/*     $NetBSD: px.c,v 1.40 2013/11/04 16:53:09 christos Exp $ */
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: px.c,v 1.39 2012/10/27 17:18:38 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: px.c,v 1.40 2013/11/04 16:53:09 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -344,6 +344,7 @@
                        sr->sr_ipdvint = STIC_INT_P_WE;
                        tc_wmb();
                        junk = *poll;
+                       __USE(junk);
                        return (0);
                }
                DELAY(STAMP_DELAY);
diff -r 4ec36f6db68f -r 40e98f749727 sys/dev/tc/pxg.c
--- a/sys/dev/tc/pxg.c  Mon Nov 04 16:52:08 2013 +0000
+++ b/sys/dev/tc/pxg.c  Mon Nov 04 16:53:09 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pxg.c,v 1.34 2012/03/13 18:40:34 elad Exp $    */
+/*     $NetBSD: pxg.c,v 1.35 2013/11/04 16:53:09 christos Exp $        */
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pxg.c,v 1.34 2012/03/13 18:40:34 elad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pxg.c,v 1.35 2013/11/04 16:53:09 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -338,6 +338,7 @@
                        sr->sr_ipdvint = STIC_INT_P_WE;
                        tc_wmb();
                        junk = *poll;
+                       __USE(junk);
                        return (0);
                }
                DELAY(STAMP_DELAY);