D30642.diff
No OneTemporary
Actions

Size

927 B

Referenced Files

None

Subscribers

None

D30642.diff
View Options

	diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
	--- a/sys/arm64/arm64/pmap.c
	+++ b/sys/arm64/arm64/pmap.c
	@@ -3518,7 +3518,11 @@

	if ((newl2 & (ATTR_S1_AP_RW_BIT \| ATTR_SW_DBM)) ==
	(ATTR_S1_AP(ATTR_S1_AP_RO) \| ATTR_SW_DBM)) {
	- if (!atomic_fcmpset_64(l2, &newl2, newl2 & ~ATTR_SW_DBM))
	+ /*
	+ * When the mapping is clean, i.e., ATTR_S1_AP_RO is set,
	+ * ATTR_SW_DBM can be cleared without a TLB invalidation.
	+ */
	+ if (!atomic_fcmpset_64(firstl3, &newl2, newl2 & ~ATTR_SW_DBM))
	goto setl2;
	newl2 &= ~ATTR_SW_DBM;
	}
	@@ -3529,6 +3533,11 @@
	setl3:
	if ((oldl3 & (ATTR_S1_AP_RW_BIT \| ATTR_SW_DBM)) ==
	(ATTR_S1_AP(ATTR_S1_AP_RO) \| ATTR_SW_DBM)) {
	+ /*
	+ * When the mapping is clean, i.e., ATTR_S1_AP_RO is
	+ * set, ATTR_SW_DBM can be cleared without a TLB
	+ * invalidation.
	+ */
	if (!atomic_fcmpset_64(l3, &oldl3, oldl3 &
	~ATTR_SW_DBM))
	goto setl3;