nits

Makefile

@@ -164,7 +164,7 @@ qemu: $K/kernel fs.img
 	sed "s/:1234/:$(GDBPORT)/" < $^ > $@
 
 qemu-gdb: $K/kernel .gdbinit fs.img
-	@echo "*** Now run 'gdb'." 1>&2
+	@echo "*** Now run 'gdb' in another window." 1>&2
 	$(QEMU) $(QEMUOPTS) -S $(QEMUGDB)
 
 # CUT HERE

kernel/syscall.c

@@ -20,7 +20,6 @@ fetchaddr(uint64 addr, uint64 *ip)
 }
 
 // Fetch the nul-terminated string at addr from the current process.
-// Doesn't actually copy the string - just sets *pp to point at it.
 // Returns length of string, not including nul, or -1 for error.
 int
 fetchstr(uint64 addr, char *buf, int max)