Remove the support for lazy cr3 switching from i386.

amd64 has already this micro-optimization removed.

Submitted by:	kib

1 files changed, 0 insertions, 92 deletions

diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c
index eb3c803..671e955 100644
--- a/sys/i386/xen/pmap.c
+++ b/sys/i386/xen/pmap.c
@@ -1681,98 +1681,6 @@ retry:
 * Pmap allocation/deallocation routines.
  ***************************************************/
 
-#ifdef SMP
-/*
- * Deal with a SMP shootdown of other users of the pmap that we are
- * trying to dispose of.  This can be a bit hairy.
- */
-static cpumask_t *lazymask;
-static u_int lazyptd;
-static volatile u_int lazywait;
-
-void pmap_lazyfix_action(void);
-
-void
-pmap_lazyfix_action(void)
-{
-	cpumask_t mymask = PCPU_GET(cpumask);
-
-#ifdef COUNT_IPIS
-	(*ipi_lazypmap_counts[PCPU_GET(cpuid)])++;
-#endif
-	if (rcr3() == lazyptd)
-		load_cr3(PCPU_GET(curpcb)->pcb_cr3);
-	atomic_clear_int(lazymask, mymask);
-	atomic_store_rel_int(&lazywait, 1);
-}
-
-static void
-pmap_lazyfix_self(cpumask_t mymask)
-{
-
-	if (rcr3() == lazyptd)
-		load_cr3(PCPU_GET(curpcb)->pcb_cr3);
-	atomic_clear_int(lazymask, mymask);
-}
-
-
-static void
-pmap_lazyfix(pmap_t pmap)
-{
-	cpumask_t mymask, mask;
-	u_int spins;
-
-	while ((mask = pmap->pm_active) != 0) {
-		spins = 50000000;
-		mask = mask & -mask;	/* Find least significant set bit */
-		mtx_lock_spin(&smp_ipi_mtx);
-#ifdef PAE
-		lazyptd = vtophys(pmap->pm_pdpt);
-#else
-		lazyptd = vtophys(pmap->pm_pdir);
-#endif
-		mymask = PCPU_GET(cpumask);
-		if (mask == mymask) {
-			lazymask = &pmap->pm_active;
-			pmap_lazyfix_self(mymask);
-		} else {
-			atomic_store_rel_int((u_int *)&lazymask,
-			    (u_int)&pmap->pm_active);
-			atomic_store_rel_int(&lazywait, 0);
-			ipi_selected(mask, IPI_LAZYPMAP);
-			while (lazywait == 0) {
-				ia32_pause();
-				if (--spins == 0)
-					break;
-			}
-		}
-		mtx_unlock_spin(&smp_ipi_mtx);
-		if (spins == 0)
-			printf("pmap_lazyfix: spun for 50000000\n");
-	}
-}
-
-#else	/* SMP */
-
-/*
- * Cleaning up on uniprocessor is easy.  For various reasons, we're
- * unlikely to have to even execute this code, including the fact
- * that the cleanup is deferred until the parent does a wait(2), which
- * means that another userland process has run.
- */
-static void
-pmap_lazyfix(pmap_t pmap)
-{
-	u_int cr3;
-
-	cr3 = vtophys(pmap->pm_pdir);
-	if (cr3 == rcr3()) {
-		load_cr3(PCPU_GET(curpcb)->pcb_cr3);
-		pmap->pm_active &= ~(PCPU_GET(cpumask));
-	}
-}
-#endif	/* SMP */
-
 /*
  * Release any resources held by the given physical map.
  * Called when a pmap initialized by pmap_pinit is being released.