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kernel: fix pointer truncation in xspanalloc(), fix format prints

--- a/sys/src/9/port/xalloc.c

+++ b/sys/src/9/port/xalloc.c

@@ -57,6 +57,7 @@

 	upages = conf.upages;

 	kpages = conf.npage - upages;

+

 	pm = palloc.mem;

 	for(i=0; i<nelem(conf.mem); i++){

 		m = &conf.mem[i];

@@ -99,7 +100,7 @@

 		panic("xspanalloc: %lud %d %lux", size, align, span);

 	if(span > 2) {

-		v = (a + span) & ~(span-1);

+		v = (a + span) & ~((uintptr)span-1);

 		t = v - a;

 		if(t > 0)

 			xhole(PADDR(a), t);

@@ -111,7 +112,7 @@

 		v = a;

 	if(align > 1)

-		v = (v + align) & ~(align-1);

+		v = (v + align) & ~((uintptr)align-1);

 	return (void*)v;

 }

@@ -261,16 +262,17 @@

 {

 	int i;

 	Hole *h;

+	uintptr s;

 	i = 0;

 	for(h = xlists.flist; h; h = h->link)

 		i++;

-

 	print("%d holes free\n", i);

-	i = 0;

+

+	s = 0;

 	for(h = xlists.table; h; h = h->link) {

 		print("%#p %#p %p\n", h->addr, h->top, h->size);

-		i += h->size;

+		s += h->size;

 	}

-	print("%d bytes free\n", i);

+	print("%lld bytes free\n", (vlong)s);

 }

-- 

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