random cleanup.  removed unused stuff, and comments about
long-gone bits.

Reference: /n/atom/patch/applied/nixportfixes
Date: Thu Jun 12 04:55:07 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/port/sysproc.c	Thu Jun 12 04:54:31 2014
+++ /sys/src/nix/port/sysproc.c	Thu Jun 12 04:54:34 2014
@@ -193,7 +193,7 @@
 	p->mp = up->mp;
 
 	wm = up->wired;
-	if(wm)
+	if(wm != nil)
 		procwired(p, wm->machno);
 	p->color = up->color;
 	ready(p);
@@ -525,9 +525,6 @@
 		}
 	}
 
-	/* Text.  Shared. Attaches to cache image if possible
-	 * but prepaged if EXAC
-	 */
 	img = attachimage(SG_TEXT|SG_RONLY, chan, up->color, UTZERO, textlim);
 	s = img->s;
 	up->seg[TSEG] = s;
--- /sys/src/nix/port/segment.c	Thu Jun 12 04:54:36 2014
+++ /sys/src/nix/port/segment.c	Thu Jun 12 04:54:37 2014
@@ -99,7 +99,6 @@
 {
 	Pte **pp, **emap;
 	Image *i;
-	extern void freezseg(Segment*);
 
 	if(s == 0)
 		return;
--- /sys/src/nix/port/portclock.c	Thu Jun 12 04:54:39 2014
+++ /sys/src/nix/port/portclock.c	Thu Jun 12 04:54:40 2014
@@ -269,9 +269,7 @@
 	t = ticks;
 	hz = HZ;
 	t *= 1000L;
-	t = t/hz;
-	ticks = t;
-	return ticks;
+	return t/hz;
 }
 
 ulong
--- /sys/src/nix/port/edf.c	Thu Jun 12 04:54:43 2014
+++ /sys/src/nix/port/edf.c	Thu Jun 12 04:54:45 2014
@@ -19,8 +19,6 @@
 static long	now;	/* Low order 32 bits of time in µs */
 
 /* Statistics stuff */
-ulong		nilcount;
-ulong		scheds;
 ulong		edfnrun;
 int		misseddeadlines;
 
@@ -79,7 +77,8 @@
 	return fmtstrcpy(f, buf);
 }
 
-long edfcycles;
+uvlong edfcycles;
+static uvlong edfenter;
 
 Edf*
 edflock(Proc *p)
@@ -91,9 +90,7 @@
 	ilock(&thelock);
 	if((e = p->edf) && (e->flags & Admitted)){
 		locksetpc(&thelock, getcallerpc(&p));
-#ifdef EDFCYCLES
-		edfcycles -= lcycles();
-#endif
+		cycles(&edfenter);
 		now = µs();
 		return e;
 	}
@@ -104,10 +101,10 @@
 void
 edfunlock(void)
 {
+	uvlong t;
 
-#ifdef EDFCYCLES
-	edfcycles += lcycles();
-#endif
+	cycles(&t);
+	edfcycles += t-edfenter;
 	edfnrun++;
 	iunlock(&thelock);
 }
--- /sys/src/nix/port/devsd.c	Thu Jun 12 04:54:49 2014
+++ /sys/src/nix/port/devsd.c	Thu Jun 12 04:54:51 2014
@@ -1275,7 +1275,7 @@
 		if(unit->sectors){
 			if(unit->dev->ifc->rctl == nil)
 				l += snprint(p+l, m-l,
-					"geometry %llud %lud\n",
+					"geometry %llud %ud\n",
 					unit->sectors, unit->secsize);
 			pp = unit->part;
 			for(i = 0; i < unit->npart; i++){