svn commit: r291850 - head/sys/i386/i386

[Konstantin Belousov]

Author: kib
Date: Sat Dec  5 08:46:41 2015
New Revision: 291850
URL: https://svnweb.freebsd.org/changeset/base/291850

Log:
  In the pmap_set_pg() function, which enables the global bit on the
  ptes mapping the kernel on CPUs where global TLB entries are
  supported, revert to flushing only non-global entries, i.e. to the
  pre-r291688 state.  There is no need to flush global TLB entries,
  since only global entries created during the previous iterations of
  the loop could exist at this moment.
  
  Submitted by:	alc
  Differential revision:	https://reviews.freebsd.org/D4368

Modified:
  head/sys/i386/i386/pmap.c

Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c	Sat Dec  5 08:34:51 2015	(r291849)
+++ head/sys/i386/i386/pmap.c	Sat Dec  5 08:46:41 2015	(r291850)
@@ -655,7 +655,7 @@ pmap_set_pg(void)
 		va = KERNBASE + KERNLOAD;
 		while (va  < endva) {
 			pdir_pde(PTD, va) |= pgeflag;
-			invltlb_glob();	/* Play it safe, invltlb() every time */
+			invltlb();	/* Flush non-PG_G entries. */
 			va += NBPDR;
 		}
 	} else {
@@ -664,7 +664,7 @@ pmap_set_pg(void)
 			pte = vtopte(va);
 			if (*pte)
 				*pte |= pgeflag;
-			invltlb_glob();	/* Play it safe, invltlb() every time */
+			invltlb();	/* Flush non-PG_G entries. */
 			va += PAGE_SIZE;
 		}
 	}