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merge

--- a/sys/src/9/pc/mmu.c

+++ b/sys/src/9/pc/mmu.c

@@ -524,8 +524,7 @@

 			panic("mmuwalk2: va %luX entry %luX", va, *table);

 		if(!(*table & PTEVALID)){

 			map = rampage();

-			if(map == nil)

-				panic("mmuwalk: page alloc failed");

+			memset(map, 0, BY2PG);

 			*table = PADDR(map)|PTEWRITE|PTEVALID;

 		}

 		table = KADDR(PPN(*table));

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -299,8 +299,6 @@

 	if(pte == nil || (*pte & PTESIZE) == 0 || (va & PGLSZ(1)-1) == 0)

 		return;

 	table = rampage();

-	if(table == nil)

-		panic("ptesplit: out of memory\n");

 	va &= -PGLSZ(1);

 	pa = *pte & ~PTESIZE;

 	for(off = 0; off < PGLSZ(1); off += PGLSZ(0))

-- 

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