use a Mach* instead of machno.  the new signature fits usage
better.  why call machcolor(mp->machno) just to have machcolor
immediately check if machno is in-bounds of the sys->machptr
array?

Reference: /n/atom/patch/applied2013/machcolorsig
Date: Mon Oct  7 06:38:29 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/main.c	Mon Oct  7 06:36:14 2013
+++ /sys/src/nix/k10/main.c	Mon Oct  7 06:36:14 2013
@@ -49,7 +49,7 @@
 	m->rdtsc = rdtsc();
 
 	DBG("cpu%d color %d tsc %lld\n",
-		m->machno, machcolor(m->machno), m->rdtsc);
+		m->machno, machcolor(m), m->rdtsc);
 
 	/*
 	 * Enable the timer interrupt.
--- /sys/src/nix/k10/devacpi.c	Mon Oct  7 06:36:14 2013
+++ /sys/src/nix/k10/devacpi.c	Mon Oct  7 06:36:14 2013
@@ -879,30 +879,26 @@
 uintmem
 acpimblocksize(uintmem addr, int *dom)
 {
-	Srat *sl;
+	Srat *s;
 
-	for(sl = srat; sl != nil; sl = sl->next)
-		if(sl->type == SRmem)
-		if(sl->mem.addr <= addr && sl->mem.addr + sl->mem.len > addr){
-			*dom = sl->mem.dom;
-			return sl->mem.len - (addr - sl->mem.addr);
+	for(s = srat; s != nil; s = s->next)
+		if(s->type == SRmem)
+		if(s->mem.addr <= addr && s->mem.addr + s->mem.len > addr){
+			*dom = s->mem.dom;
+			return s->mem.len - (addr - s->mem.addr);
 		}
 	return 0;
 }
 
 int
-machcolor(uint machno)
+machcolor(Mach *mp)
 {
-	Srat *sl;
-	Mach *mp;
+	Srat *s;
 
-	if(machno >= MACHMAX)
-		return -1;
-	if((mp = sys->machptr[machno]) == nil)
-		return -1;
-	for(sl = srat; sl != nil; sl = sl->next)
-		if(sl->type == SRlapic && sl->lapic.apic == mp->apicno)
-			return sl->lapic.dom;
+	for(s = srat; s != nil; s = s->next)
+		if(s->type == SRlapic)
+		if(s->lapic.apic == mp->apicno)
+			return s->lapic.dom;
 	return -1;
 }
 
@@ -1509,8 +1505,6 @@
 		ioalloc(addr, len, 0, "acpi");
 }
 
-<<<<<<< devacpi.c.orig
-=======
 enum {
 	Blegacy		= 1<<0,
 	B8042kbd	= 1<<1,
@@ -1533,7 +1527,6 @@
 	sys->nocmos = i&Bnocmos;
 }
 
->>>>>>> devacpi.c
 int
 devacpiinit(void)
 {
@@ -1542,10 +1535,7 @@
 		acpirsdptr();
 		if(fadt.smicmd == 0)
 			return -1;
-<<<<<<< devacpi.c.orig
-=======
 		iapcbootarch();
->>>>>>> devacpi.c
 	}
 	return 0;
 }
@@ -1559,18 +1549,11 @@
 	 * This was written for the stock kernel.
 	 * This code must use 64 registers to be acpi ready in nix.
 	 */
-<<<<<<< devacpi.c.orig
-	if(1 || devacpiinit() < 0)
-=======
 	if(devacpiinit() < 0)
->>>>>>> devacpi.c
 		error("no acpi");
 
-<<<<<<< devacpi.c.orig
-=======
 	error("acpi disabled");
 
->>>>>>> devacpi.c
 	/*
 	 * should use fadt->xpm* and fadt->xgpe* registers for 64 bits.
 	 * We are not ready in this kernel for that.
--- /sys/src/nix/port/sysproc.c	Mon Oct  7 06:36:14 2013
+++ /sys/src/nix/port/sysproc.c	Mon Oct  7 06:36:14 2013
@@ -247,7 +247,7 @@
 		if(mp->sch->nrdy > m->sch->nrdy)/* more loaded than us, ignore */
 			continue;
 		p->mp = mp;
-		p->color = machcolor(mp->machno);
+		p->color = machcolor(mp);
 		machno = mach + 1;
 iprint("donate %d -> %d\n", m->machno, mp->machno);
 		sched();
@@ -385,7 +385,7 @@
 	|| datalim < textlim || bsslim < datalim)
 		error(Ebadexec);
 
-	up->color = machcolor(m->machno);
+	up->color = machcolor(m);
 
 	/*
 	 * The new stack is created in ESEG, temporarily mapped elsewhere.
@@ -1126,7 +1126,6 @@
 	 * int semacquire(int* addr, int block);
 	 */
 	addr = va_arg(list, int*);
-	addr = validaddr(addr, sizeof(int), 1);
 	evenaddr(PTR2UINT(addr));
 	block = va_arg(list, int);
 
--- /sys/src/nix/port/portfns.h	Mon Oct  7 06:36:14 2013
+++ /sys/src/nix/port/portfns.h	Mon Oct  7 06:36:14 2013
@@ -163,7 +163,7 @@
 long		logread(Log*, void*, ulong, long);
 Page*		lookpage(Image*, ulong);
 Cmdtab*		lookupcmd(Cmdbuf*, Cmdtab*, int);
-int		machcolor(uint);
+int		machcolor(Mach*);
 void		mallocinit(void);
 long		mallocreadsummary(Chan*, void*, long, long);
 void		mallocsummary(void);
--- /sys/src/nix/port/proc.c	Mon Oct  7 06:36:14 2013
+++ /sys/src/nix/port/proc.c	Mon Oct  7 06:36:14 2013
@@ -68,7 +68,7 @@
 {
 	int color;
 
-	color = machcolor(mp->machno);
+	color = machcolor(mp);
 	if(color < 0){
 //		print("cpu%d: unknown color\n", mp->machno);
 		color = 0;
@@ -847,7 +847,7 @@
 	 */
 	if(up == nil || p != up)
 		return;
-	up->color = machcolor(up->mp->machno);
+	up->color = machcolor(up->mp);
 	qlock(&up->seglock);
 	for(i = 0; i < NSEG; i++)
 		if(up->seg[i])