From c6bdc0380b504f6df8ecc6e4666bbcf43b2780d0 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 4 Aug 1995 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1995-08-04

---
 port/alarm.c      |  4 +---
 port/dev.c        |  1 -
 port/devaudio.c   | 26 ++++++--------------------
 port/devboot.c    | 12 ++++--------
 port/devcons.c    | 15 +++++----------
 port/devdup.c     | 23 +++++++----------------
 port/devenv.c     | 11 +++--------
 port/devkprof.c   | 14 ++++----------
 port/devlance.c   | 13 ++++---------
 port/devmouse.c   | 22 +++++++---------------
 port/devns16552.c | 14 ++++----------
 port/devpipe.c    | 18 +++++-------------
 port/devproc.c    |  9 +++------
 port/devroot.c    | 16 +++++-----------
 port/devsrv.c     | 13 ++++---------
 port/net.c        |  3 +--
 port/netif.c      |  9 +++++++--
 port/netif.h      |  3 ++-
 port/page.c       |  3 +--
 port/print.c      |  7 ++-----
 port/segment.c    |  1 -
 port/swap.c       |  4 +---
 port/sysproc.c    |  7 ++-----
 23 files changed, 78 insertions(+), 170 deletions(-)

diff --git a/port/alarm.c b/port/alarm.c
index 98b752087afdf823e4dd4f06c1aee3ba0bfdc157..9f8efdca1b903abdd3e27feed5b058af34790ac5 100644
--- a/port/alarm.c
+++ b/port/alarm.c
@@ -9,13 +9,11 @@ Rendez	alarmr;
 Talarm	talarm;
 
 void
-alarmkproc(void *arg)
+alarmkproc(void*)
 {
 	Proc *rp;
 	ulong now;
 
-	USED(arg);
-
 	for(;;){
 		now = MACHP(0)->ticks;
 		qlock(&alarms);
diff --git a/port/dev.c b/port/dev.c
index 6b821ceb35f68b34334853712815c0f77c1d9e65..77a7a6bd989982a34b9928e14d98f14e865db88f 100644
--- a/port/dev.c
+++ b/port/dev.c
@@ -67,7 +67,6 @@ devattach(int tc, char *spec)
 	Chan *c;
 	char buf[NAMELEN+4];
 
-	USED(spec);
 	c = newchan();
 	c->qid = (Qid){CHDIR, 0};
 	c->type = devno(tc, 0);
diff --git a/port/devaudio.c b/port/devaudio.c
index 827dfcd66b26a99d83154f1da886970f007b6898..5f43e3298aaa818b80e158233953e2afb72c4f72 100644
--- a/port/devaudio.c
+++ b/port/devaudio.c
@@ -420,9 +420,8 @@ audiosbintr(void)
 }
 
 void
-pcaudiosbintr(Ureg *ureg, void *rock)
+pcaudiosbintr(Ureg*, void*)
 {
-	USED(ureg, rock);
 /*	print("sb16 audio interrupt\n");	/**/
 	audiosbintr();
 }
@@ -434,9 +433,8 @@ audiodmaintr(void)
 }
 
 static int
-anybuf(void *p)
+anybuf(void*)
 {
-	USED(p);
 	return audio.intr;
 }
 
@@ -664,13 +662,8 @@ audioopen(Chan *c, int omode)
 }
 
 void
-audiocreate(Chan *c, char *name, int omode, ulong perm)
+audiocreate(Chan*, char*, int, ulong)
 {
-	USED(c);
-	USED(name);
-	USED(omode);
-	USED(perm);
-
 	error(Eperm);
 }
 
@@ -806,15 +799,13 @@ audiobread(Chan *c, long n, ulong offset)
 }
 
 long
-audiowrite(Chan *c, char *a, long n, ulong offset)
+audiowrite(Chan *c, char *a, long n, ulong)
 {
 	long m, n0;
 	int i, nf, v, left, right, in, out;
 	char buf[255], *field[Ncmd];
 	Buf *b;
 
-	USED(offset);
-
 	n0 = n;
 	switch(c->qid.path & ~CHDIR) {
 	default:
@@ -941,19 +932,14 @@ audiobwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void
-audioremove(Chan *c)
+audioremove(Chan*)
 {
-	USED(c);
-
 	error(Eperm);
 }
 
 void
-audiowstat(Chan *c, char *dp)
+audiowstat(Chan*, char*)
 {
-	USED(c);
-	USED(dp);
-
 	error(Eperm);
 }
 
diff --git a/port/devboot.c b/port/devboot.c
index 3d64483a7cd00c95ca6d99e582e7c706cbe999c1..ef1ad4f674674f953f268474d18320ea8987724e 100644
--- a/port/devboot.c
+++ b/port/devboot.c
@@ -60,16 +60,14 @@ bootopen(Chan *c, int omode)
 }
 
 void	 
-bootcreate(Chan *c, char *name, int omode, ulong perm)
+bootcreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
 void	 
-bootclose(Chan *c)
+bootclose(Chan*)
 {
-	USED(c);
 }
 
 long	 
@@ -133,15 +131,13 @@ bootbwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void	 
-bootremove(Chan *c)
+bootremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void	 
-bootwstat(Chan *c, char *dp)
+bootwstat(Chan*, char*)
 {
-	USED(c, dp);
 	error(Eperm);
 }
diff --git a/port/devcons.c b/port/devcons.c
index 84aa886277eae26f3fe5a1e7f1d32d59ee1115fb..decd8ac53385d4da350277641395a149dae03f06 100644
--- a/port/devcons.c
+++ b/port/devcons.c
@@ -119,12 +119,11 @@ print(char *fmt, ...)
 }
 
 int
-fprint(int fd, char *fmt, ...)	/* needed so we can use user-level libg */
+fprint(int, char *fmt, ...)	/* needed so we can use user-level libg */
 {
 	char buf[PRINTSIZE];
 	int n;
 
-	USED(fd);
 	n = doprint(buf, buf+sizeof(buf), fmt, (&fmt+1)) - buf;
 	putstrn(buf, n);
 
@@ -266,13 +265,12 @@ kbdcr2nl(Queue *q, int ch)
  *  Called at interrupt time to process a character.
  */
 int
-kbdputc(Queue *q, int ch)
+kbdputc(Queue*, int ch)
 {
 	int n;
 	char buf[3];
 	Rune r;
 
-	USED(q);
 	r = ch;
 	n = runetochar(buf, &r);
 	if(n == 0)
@@ -455,9 +453,8 @@ consopen(Chan *c, int omode)
 }
 
 void
-conscreate(Chan *c, char *name, int omode, ulong perm)
+conscreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
@@ -853,16 +850,14 @@ consbwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void
-consremove(Chan *c)
+consremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void
-conswstat(Chan *c, char *dp)
+conswstat(Chan*, char*)
 {
-	USED(c, dp);
 	error(Eperm);
 }
 
diff --git a/port/devdup.c b/port/devdup.c
index c7a1eda019fb64651280d91adc9e7b2052c8d208..dd113cd08e8d1d37b4d80cdefa044f14a77e9f49 100644
--- a/port/devdup.c
+++ b/port/devdup.c
@@ -9,15 +9,13 @@
 
 
 int
-dupgen(Chan *c, Dirtab *tab, int ntab, int s, Dir *dp)
+dupgen(Chan *c, Dirtab*, int, int s, Dir *dp)
 {
 	char buf[8];
 	Fgrp *fgrp = up->fgrp;
 	Chan *f;
 	static int perm[] = { 0400, 0200, 0600, 0 };
 
-	USED(tab);
-	USED(ntab);
 	if(s >= NFD)
 		return -1;
 	if((f=fgrp->fd[s]) == 0)
@@ -84,39 +82,33 @@ dupopen(Chan *c, int omode)
 }
 
 void
-dupcreate(Chan *c, char *name, int omode, ulong perm)
+dupcreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
 void
-dupremove(Chan *c)
+dupremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void
-dupwstat(Chan *c, char *dp)
+dupwstat(Chan*, char*)
 {
-	USED(c);
-	USED(dp);
 	error(Egreg);
 }
 
 void
-dupclose(Chan *c)
+dupclose(Chan*)
 {
-	USED(c);
 }
 
 long
-dupread(Chan *c, void *va, long n, ulong offset)
+dupread(Chan *c, void *va, long n, ulong)
 {
 	char *a = va;
 
-	USED(offset);
 	if(c->qid.path != CHDIR)
 		panic("dupread");
 	return devdirread(c, a, n, (Dirtab *)0, 0L, dupgen);
@@ -129,9 +121,8 @@ dupbread(Chan *c, long n, ulong offset)
 }
 
 long
-dupwrite(Chan *c, void *va, long n, ulong offset)
+dupwrite(Chan*, void*, long, ulong)
 {
-	USED(c, va, n, offset);
 	panic("dupwrite");
 	return 0;		/* not reached */
 }
diff --git a/port/devenv.c b/port/devenv.c
index 077421bce3312ef7631b9a6760632cb7d3ba9525..d87ede092a8d7624db8175fd991ac7b90780c620 100644
--- a/port/devenv.c
+++ b/port/devenv.c
@@ -23,14 +23,11 @@ envinit(void)
 }
 
 int
-envgen(Chan *c, Dirtab *tab, int ntab, int s, Dir *dp)
+envgen(Chan *c, Dirtab*, int, int s, Dir *dp)
 {
 	Egrp *eg;
 	Evalue *e;
 
-	USED(tab);
-	USED(ntab);
-
 	eg = up->egrp;
 	qlock(eg);
 
@@ -177,16 +174,14 @@ envremove(Chan *c)
 }
 
 void
-envwstat(Chan *c, char *db)
+envwstat(Chan*, char*)
 {
-	USED(c, db);
 	error(Eperm);
 }
 
 void
-envclose(Chan * c)
+envclose(Chan*)
 {
-	USED(c);
 }
 
 long
diff --git a/port/devkprof.c b/port/devkprof.c
index a9340e296c61844d244ff68f2b7da6ad22f3d03a..f2ec3759b2bbfff79ab96721e391b5c9d89be629 100644
--- a/port/devkprof.c
+++ b/port/devkprof.c
@@ -95,30 +95,26 @@ kprofopen(Chan *c, int omode)
 }
 
 void
-kprofcreate(Chan *c, char *name, int omode, ulong perm)
+kprofcreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
 void
-kprofremove(Chan *c)
+kprofremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void
-kprofwstat(Chan *c, char *dp)
+kprofwstat(Chan*, char*)
 {
-	USED(c, dp);
 	error(Eperm);
 }
 
 void
 kprofclose(Chan *c)
 {
-	USED(c);
 }
 
 long
@@ -169,10 +165,8 @@ kprofbread(Chan *c, long n, ulong offset)
 }
 
 long
-kprofwrite(Chan *c, char *a, long n, ulong offset)
+kprofwrite(Chan *c, char *a, long n, ulong)
 {
-	USED(offset);
-
 	switch((int)(c->qid.path&~CHDIR)){
 	case Kprofctlqid:
 		if(strncmp(a, "startclr", 8) == 0){
diff --git a/port/devlance.c b/port/devlance.c
index e01ae84ebc7e6129bd812ef66dc5e832b66d02b3..04254982c7ca94f3aeb12113ccc7ceba1c74c10b 100644
--- a/port/devlance.c
+++ b/port/devlance.c
@@ -366,9 +366,8 @@ lanceintr(void)
  *  turn promiscuous mode on/off
  */
 static void
-promiscuous(void *arg, int on)
+promiscuous(void*, int on)
 {
-	USED(arg);
 	if(on)
 		lancestart(PROM);
 	else
@@ -408,9 +407,8 @@ lanceopen(Chan *c, int omode)
 }
 
 void
-lancecreate(Chan *c, char *name, int omode, ulong perm)
+lancecreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 }
 
 void
@@ -465,13 +463,11 @@ etherloop(Etherpkt *p, long n)
 }
 
 long
-lancewrite(Chan *c, void *buf, long n, ulong offset)
+lancewrite(Chan *c, void *buf, long n, ulong)
 {
 	Msg *m;
 	Lancepkt *p;
 
-	USED(offset);
-
 	if(n > ETHERMAXTU)
 		error(Ebadarg);
 
@@ -522,9 +518,8 @@ lancebwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void
-lanceremove(Chan *c)
+lanceremove(Chan*)
 {
-	USED(c);
 }
 
 void
diff --git a/port/devmouse.c b/port/devmouse.c
index e3f805b7e30f0408e12f288e6aa1dacc7aa2bdb2..4ac7d72c556239c98095bb0e9d966efaf292000c 100644
--- a/port/devmouse.c
+++ b/port/devmouse.c
@@ -146,25 +146,22 @@ mouseopen(Chan *c, int omode)
 }
 
 void
-mousecreate(Chan *c, char *name, int omode, ulong perm)
+mousecreate(Chan*, char*, int, ulong)
 {
 	if(!conf.monitor)
 		error(Egreg);
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
 void
-mouseremove(Chan *c)
+mouseremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void
-mousewstat(Chan *c, char *db)
+mousewstat(Chan*, char*)
 {
-	USED(c, db);
 	error(Eperm);
 }
 
@@ -237,13 +234,12 @@ mousebread(Chan *c, long n, ulong offset)
 }
 
 long
-mousewrite(Chan *c, void *va, long n, ulong offset)
+mousewrite(Chan *c, void *va, long n, ulong)
 {
 	char *p;
 	Point pt;
 	char buf[64];
 
-	USED(offset);
 	p = va;
 	switch(c->qid.path){
 	case CHDIR:
@@ -377,7 +373,7 @@ mousetrack(int b, int dx, int dy)
  *  shift & right button is the same as middle button (for 2 button mice)
  */
 int
-m3mouseputc(void *q, int c)
+m3mouseputc(void*, int c)
 {
 	static uchar msg[3];
 	static int nb;
@@ -386,8 +382,6 @@ m3mouseputc(void *q, int c)
 	short x;
 	int dx, dy, newbuttons;
 
-	USED(q);
-
 	/* 
 	 *  check bit 6 for consistency
 	 */
@@ -419,14 +413,13 @@ m3mouseputc(void *q, int c)
  *  shift & right button is the same as middle button (for 2 button mice)
  */
 int
-mouseputc(void *q, int c)
+mouseputc(void*, int c)
 {
 	static short msg[5];
 	static int nb;
 	static uchar b[] = {0, 4, 2, 6, 1, 5, 3, 7, 0, 2, 2, 6, 1, 5, 3, 7};
 	int dx, dy, newbuttons;
 
-	USED(q);
 	if((c&0xF0) == 0x80)
 		nb=0;
 	msg[nb] = c;
@@ -443,9 +436,8 @@ mouseputc(void *q, int c)
 }
 
 int
-mousechanged(void *m)
+mousechanged(void*)
 {
-	USED(m);
 	return mouse.lastcounter - mouse.counter;
 }
 
diff --git a/port/devns16552.c b/port/devns16552.c
index f2d2e8aa85a738c647e47097b189a7afdd023d25..d38e6c21a500d6eeb4b379d0a1beba14d2248902 100644
--- a/port/devns16552.c
+++ b/port/devns16552.c
@@ -762,9 +762,8 @@ ns16552open(Chan *c, int omode)
 }
 
 void
-ns16552create(Chan *c, char *name, int omode, ulong perm)
+ns16552create(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
@@ -794,14 +793,12 @@ ns16552close(Chan *c)
 }
 
 static long
-uartstatus(Chan *c, Uart *p, void *buf, long n, long offset)
+uartstatus(Chan*, Uart *p, void *buf, long n, long offset)
 {
 	uchar mstat;
 	uchar tstat;
 	char str[256];
 
-	USED(c);
-
 	str[0] = 0;
 	tstat = p->sticky[Mctl];
 	mstat = uartrdreg(p, Mstat);
@@ -933,13 +930,11 @@ ns16552ctl(Uart *p, char *cmd)
 }
 
 long
-ns16552write(Chan *c, void *buf, long n, ulong offset)
+ns16552write(Chan *c, void *buf, long n, ulong)
 {
 	Uart *p;
 	char cmd[32];
 
-	USED(offset);
-
 	if(c->qid.path & CHDIR)
 		error(Eperm);
 
@@ -972,9 +967,8 @@ ns16552bwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void
-ns16552remove(Chan *c)
+ns16552remove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
diff --git a/port/devpipe.c b/port/devpipe.c
index 5ba9b7e0d941d82fabfbd22a6b9dba15ad6645a8..9785769a37fc82f9ecbddf4f649d7ef0908d01eb 100644
--- a/port/devpipe.c
+++ b/port/devpipe.c
@@ -209,9 +209,8 @@ piperemove(Chan*)
 }
 
 void
-pipewstat(Chan *c, char *db)
+pipewstat(Chan*, char*)
 {
-	USED(c, db);
 	error(Eperm);
 }
 
@@ -268,12 +267,10 @@ pipeclose(Chan *c)
 }
 
 long
-piperead(Chan *c, void *va, long n, ulong offset)
+piperead(Chan *c, void *va, long n, ulong)
 {
 	Pipe *p;
 
-	USED(offset);
-
 	p = c->aux;
 
 	switch(NETTYPE(c->qid.path)){
@@ -294,8 +291,6 @@ pipebread(Chan *c, long n, ulong offset)
 {
 	Pipe *p;
 
-	USED(offset);
-
 	p = c->aux;
 
 	switch(NETTYPE(c->qid.path)){
@@ -313,12 +308,10 @@ pipebread(Chan *c, long n, ulong offset)
  *  the process.
  */
 long
-pipewrite(Chan *c, void *va, long n, ulong offset)
+pipewrite(Chan *c, void *va, long n, ulong)
 {
 	Pipe *p;
 
-	USED(offset);
-
 	if((getstatus()&IE) == 0)
 		print("pipewrite hi %lux\n", getcallerpc(c));
 	if(waserror()) {
@@ -348,13 +341,11 @@ pipewrite(Chan *c, void *va, long n, ulong offset)
 }
 
 long
-pipebwrite(Chan *c, Block *bp, ulong offset)
+pipebwrite(Chan *c, Block *bp, ulong)
 {
 	long n;
 	Pipe *p;
 
-	USED(offset);
-
 	if(waserror()) {
 		/* avoid notes when pipe is a mounted queue */
 		if((c->flag & CMSG) == 0)
@@ -373,6 +364,7 @@ pipebwrite(Chan *c, Block *bp, ulong offset)
 		break;
 
 	default:
+		n = 0;
 		panic("pipebwrite");
 	}
 
diff --git a/port/devproc.c b/port/devproc.c
index 5d5574ecc55bc9232ab3445522e4fcafde8e6d66..e5e454c7d18568418eeacaa6bb657119a58d2ed0 100644
--- a/port/devproc.c
+++ b/port/devproc.c
@@ -73,14 +73,13 @@ int	procstopped(void*);
 void	mntscan(Mntwalk*);
 
 int
-procgen(Chan *c, Dirtab *tab, int ntab, int s, Dir *dp)
+procgen(Chan *c, Dirtab *tab, int, int s, Dir *dp)
 {
 	Qid qid;
 	Proc *p;
 	char buf[NAMELEN];
 	ulong pid, path, perm, len;
 
-	USED(ntab);
 	if(c->qid.path == CHDIR){
 		if(s >= conf.nproc)
 			return -1;
@@ -224,16 +223,14 @@ procopen(Chan *c, int omode)
 }
 
 void
-proccreate(Chan *c, char *name, int omode, ulong perm)
+proccreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
 void
-procremove(Chan *c)
+procremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
diff --git a/port/devroot.c b/port/devroot.c
index ad3331649e45b24e241f10bcf1d865fdfd5aa947..03e3356c2fdb12dd5c16972986d721445613f1e6 100644
--- a/port/devroot.c
+++ b/port/devroot.c
@@ -131,9 +131,8 @@ rootopen(Chan *c, int omode)
 }
 
 void	 
-rootcreate(Chan *c, char *name, int omode, ulong perm)
+rootcreate(Chan*, char*, int, ulong)
 {
-	USED(c, name, omode, perm);
 	error(Eperm);
 }
 
@@ -143,7 +142,6 @@ rootcreate(Chan *c, char *name, int omode, ulong perm)
 void	 
 rootclose(Chan *c)
 {
-	USED(c);
 	switch(c->qid.path) {
 	default:
 		break;
@@ -155,9 +153,8 @@ rootclose(Chan *c)
 }
 
 int
-rdrdy(void *a)
+rdrdy(void*)
 {
-	USED(a);
 	return reclist.q != 0;
 }
 
@@ -218,11 +215,10 @@ rootbread(Chan *c, long n, ulong offset)
 }
 
 long	 
-rootwrite(Chan *c, void *buf, long n, ulong offset)
+rootwrite(Chan *c, void *buf, long n, ulong)
 {
 	char tmp[256];
 
-	USED(offset);
 	switch(c->qid.path & ~CHDIR){
 	default:
 		error(Egreg);
@@ -245,16 +241,14 @@ rootbwrite(Chan *c, Block *bp, ulong offset)
 }
 
 void	 
-rootremove(Chan *c)
+rootremove(Chan*)
 {
-	USED(c);
 	error(Eperm);
 }
 
 void	 
-rootwstat(Chan *c, char *dp)
+rootwstat(Chan*, char*)
 {
-	USED(c, dp);
 	error(Eperm);
 }
 
diff --git a/port/devsrv.c b/port/devsrv.c
index 14b17383bdf8ac40d5648cad60b712e1bfa8e126..70c1b3d965406ada275fc2cd545a7e33b871c650 100644
--- a/port/devsrv.c
+++ b/port/devsrv.c
@@ -23,12 +23,10 @@ static Srv	*srv;
 static int	qidpath;
 
 int
-srvgen(Chan *c, Dirtab *tab, int ntab, int s, Dir *dp)
+srvgen(Chan *c, Dirtab*, int, int s, Dir *dp)
 {
 	Srv *sp;
 
-	USED(tab);
-	USED(ntab);
 	qlock(&srvlk);
 	for(sp = srv; sp && s; sp = sp->link)
 		s--;
@@ -213,15 +211,13 @@ srvwstat(Chan *c, char *dp)
 }
 
 void
-srvclose(Chan *c)
+srvclose(Chan*)
 {
-	USED(c);
 }
 
 long
-srvread(Chan *c, void *va, long n, ulong offset)
+srvread(Chan *c, void *va, long n, ulong)
 {
-	USED(offset);
 	isdir(c);
 	return devdirread(c, va, n, 0, 0, srvgen);
 }
@@ -233,14 +229,13 @@ srvbread(Chan *c, long n, ulong offset)
 }
 
 long
-srvwrite(Chan *c, void *va, long n, ulong offset)
+srvwrite(Chan *c, void *va, long n, ulong)
 {
 	Srv *sp;
 	Chan *c1;
 	int fd;
 	char buf[32];
 
-	USED(offset);
 	if(n >= sizeof buf)
 		error(Egreg);
 	memmove(buf, va, n);	/* so we can NUL-terminate */
diff --git a/port/net.c b/port/net.c
index b9efca8bed46f9515b3180c0f57d59add5df3ddb..43ee1a20a6dc73847eac279970b781887601ee76 100644
--- a/port/net.c
+++ b/port/net.c
@@ -32,7 +32,7 @@ findprot(Network *np, int id)
  *  generate a 3 level directory
  */
 int
-netgen(Chan *c, void *vp, int ntab, int i, Dir *dp)
+netgen(Chan *c, void *vp, int, int i, Dir *dp)
 {
 	Qid q;
 	char buf[32];
@@ -42,7 +42,6 @@ netgen(Chan *c, void *vp, int ntab, int i, Dir *dp)
 	int perm;
 	char *o;
 
-	USED(ntab);
 	q.vers = 0;
 
 	/* top level directory contains the name of the network */
diff --git a/port/netif.c b/port/netif.c
index ad580dc9ce9f6d206338fbd588e7b7d1f90421cf..c520f6823e57c054352e2f5cb2cd4cb345c4b0db 100644
--- a/port/netif.c
+++ b/port/netif.c
@@ -30,7 +30,7 @@ netifinit(Netif *nif, char *name, int nfile, ulong limit)
  *  generate a 3 level directory
  */
 static int
-netifgen(Chan *c, void *vp, int ntab, int i, Dir *dp)
+netifgen(Chan *c, void *vp, int, int i, Dir *dp)
 {
 	Qid q;
 	char buf[32];
@@ -40,7 +40,6 @@ netifgen(Chan *c, void *vp, int ntab, int i, Dir *dp)
 	int perm;
 	char *o;
 
-	USED(ntab);
 	q.vers = 0;
 
 	/* top level directory contains the name of the network */
@@ -102,6 +101,10 @@ netifgen(Chan *c, void *vp, int ntab, int i, Dir *dp)
 		q.path = NETQID(NETID(c->qid.path), Ntypeqid);
 		devdir(c, q, "type", 0, eve, 0444, dp);
 		break;
+	case 4:
+		q.path = NETQID(NETID(c->qid.path), Nifstatqid);
+		devdir(c, q, "ifstats", 0, eve, 0444, dp);
+		break;
 	default:
 		return -1;
 	}
@@ -187,6 +190,8 @@ netifread(Netif *nif, Chan *c, void *a, long n, ulong offset)
 	case Ntypeqid:
 		f = nif->f[NETID(c->qid.path)];
 		return readnum(offset, a, n, f->type, NUMSIZE);
+	case Nifstatqid:
+		return 0;
 	}
 	error(Ebadarg);
 	return -1;	/* not reached */
diff --git a/port/netif.h b/port/netif.h
index 12260064bd7b503509930a3e660cbed88298721c..2cc4d778e40dfaa23f7389761d6f07532f2cd4f9 100644
--- a/port/netif.h
+++ b/port/netif.h
@@ -13,6 +13,7 @@ enum
 	Nctlqid,
 	Nstatqid,
 	Ntypeqid,
+	Nifstatqid,
 };
 
 /*
@@ -65,7 +66,7 @@ struct Netif
 	int	inpackets;
 	int	outpackets;
 	int	crcs;		/* input crc errors */
-	int	oerrs;		/* output erros */
+	int	oerrs;		/* output errors */
 	int	frames;		/* framing errors */
 	int	overflows;	/* packet overflows */
 	int	buffs;		/* buffering errors */
diff --git a/port/page.c b/port/page.c
index bf06b6f9e609bdb15ee18b28cdbfda8053716c5a..a036a158c553dcf14bae50c4cdbd4a2f4fae25ef 100644
--- a/port/page.c
+++ b/port/page.c
@@ -165,9 +165,8 @@ retry:
 }
 
 int
-ispages(void *p)
+ispages(void*)
 {
-	USED(p);
 	return palloc.freecount >= swapalloc.highwater;
 }
 
diff --git a/port/print.c b/port/print.c
index f5dc7a757e6f73bc28c560e68320fd955109e668..dbb39da54d1d07087e3138d984a23fb95b76ed8f 100644
--- a/port/print.c
+++ b/port/print.c
@@ -525,10 +525,9 @@ sconv(void *o, Fconv *fp)
 
 static
 int
-percent(void *o, Fconv *fp)
+percent(void*, Fconv *fp)
 {
 
-	USED(o);
 	if(fp->out < fp->eout)
 		*fp->out++ = '%';
 	return 0;
@@ -536,12 +535,10 @@ percent(void *o, Fconv *fp)
 
 static
 int
-flags(void *o, Fconv *fp)
+flags(void*, Fconv *fp)
 {
 	int f;
 
-	USED(o);
-
 	f = 0;
 	switch(fp->chr) {
 	case '+':
diff --git a/port/segment.c b/port/segment.c
index df3c8ccf08f0e6db39233a3a0735fe9b0626d0e3..71aa31fd9a04acf80dd5bee0bbc2498eef9e9fa2 100644
--- a/port/segment.c
+++ b/port/segment.c
@@ -431,7 +431,6 @@ segattach(Proc *p, ulong attr, char *name, ulong va, ulong len)
 	Segment *s;
 	Physseg *ps;
 
-	USED(p);
 	if(va != 0 && (va&KZERO) == KZERO)	/* BUG: Only ok for now */
 		error(Ebadarg);
 
diff --git a/port/swap.c b/port/swap.c
index 2f3d5935ac7ad0558f890ecc518bee106c24704c..210d2b7e2fa4331bc0f34271f7f4fc2a47e40a17 100644
--- a/port/swap.c
+++ b/port/swap.c
@@ -103,7 +103,6 @@ pager(void *junk)
 	if(waserror()) 
 		panic("pager: os error\n");
 
-	USED(junk);
 	p = proctab(0);
 	ep = &p[conf.nproc];
 
@@ -321,9 +320,8 @@ executeio(void)
 }
 
 int
-needpages(void *p)
+needpages(void*)
 {
-	USED(p);
 	return palloc.freecount < swapalloc.headroom;
 }
 
diff --git a/port/sysproc.c b/port/sysproc.c
index 838ebc3299bedfc908dd6e874f6944b6c846bf0b..d409ea54a3de0fb786019f909e8acc3f69752e27 100644
--- a/port/sysproc.c
+++ b/port/sysproc.c
@@ -452,9 +452,8 @@ shargs(char *s, int n, char **ap)
 }
 
 int
-return0(void *a)
+return0(void*)
 {
-	USED(a);
 	return 0;
 }
 
@@ -519,9 +518,8 @@ syswait(ulong *arg)
 }
 
 long
-sysdeath(ulong *arg)
+sysdeath(ulong*)
 {
-	USED(arg);
 	pprint("deprecated system call\n");
 	pexit("Suicide", 0);
 	return 0;	/* not reached */
@@ -543,7 +541,6 @@ syserrstr(ulong *arg)
 long
 sysnotify(ulong *arg)
 {
-	USED(arg);
 	if(arg[0] != 0)
 		validaddr(arg[0], sizeof(ulong), 0);
 	up->notify = (int(*)(void*, char*))(arg[0]);