Initialize wq before zalloc

zalloc uses work queues. Technically, we're okay as long as we don't *use* the zallocator until wq is initialed, but that seems fragile.

Initialize wq before zalloc
38fd95b5 · Austin Clements · bf9656f1 · 38fd95b5
--- a/kernel/main.cc
+++ b/kernel/main.cc
@@ -114,7 +114,8 @@ cmain(u64 mbmagic, u64 mbaddr)
  initlapic();
  initcmdline();
  initkalloc(mbaddr);
-  initz();
+  initwq();        // (after kalloc)
+  initz();         // (after wq)
  initproc();      // process table
  initsched();     // scheduler run queues
  initidle();
@@ -123,7 +124,6 @@ cmain(u64 mbmagic, u64 mbaddr)
  initinode();     // inode cache
  initdisk();      // disk
  initconsole();
-  initwq();
  initfutex();
  initsamp();
  initlockstat();