3 files changed, 21 insertions, 12 deletions

diff --git a/arch/ia64/kernel/cyclone.c b/arch/ia64/kernel/cyclone.c
index 6ade3790ce07..e00b21514f7c 100644
--- a/arch/ia64/kernel/cyclone.c
+++ b/arch/ia64/kernel/cyclone.c
@@ -36,7 +36,7 @@ int __init init_cyclone_clock(void)
 	u32* volatile cyclone_timer;	/* Cyclone MPMC0 register */
 
 	if (!use_cyclone)
-		return -ENODEV;
+		return 0;
 
 	printk(KERN_INFO "Summit chipset: Starting Cyclone Counter.\n");
 
diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S
index 9f80569a32b0..dcd906fe5749 100644
--- a/arch/ia64/kernel/ivt.S
+++ b/arch/ia64/kernel/ivt.S
@@ -561,11 +561,12 @@ ENTRY(dirty_bit)
 	;;					// avoid RAW on r18
 	mov ar.ccv=r18				// set compare value for cmpxchg
 	or r25=_PAGE_D|_PAGE_A,r18		// set the dirty and accessed bits
+	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
 	;;
-	cmpxchg8.acq r26=[r17],r25,ar.ccv
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only update if page is present
 	mov r24=PAGE_SHIFT<<2
 	;;
-	cmp.eq p6,p7=r26,r18
+(p6)	cmp.eq p6,p7=r26,r18			// Only compare if page is present
 	;;
 (p6)	itc.d r25				// install updated PTE
 	;;
@@ -626,11 +627,12 @@ ENTRY(iaccess_bit)
 	;;
 	mov ar.ccv=r18				// set compare value for cmpxchg
 	or r25=_PAGE_A,r18			// set the accessed bit
+	tbit.z p7,p6 = r18,_PAGE_P_BIT	 	// Check present bit
 	;;
-	cmpxchg8.acq r26=[r17],r25,ar.ccv
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page present
 	mov r24=PAGE_SHIFT<<2
 	;;
-	cmp.eq p6,p7=r26,r18
+(p6)	cmp.eq p6,p7=r26,r18			// Only if page present
 	;;
 (p6)	itc.i r25				// install updated PTE
 	;;
@@ -680,11 +682,12 @@ ENTRY(daccess_bit)
 	;;					// avoid RAW on r18
 	mov ar.ccv=r18				// set compare value for cmpxchg
 	or r25=_PAGE_A,r18			// set the dirty bit
+	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
 	;;
-	cmpxchg8.acq r26=[r17],r25,ar.ccv
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page is present
 	mov r24=PAGE_SHIFT<<2
 	;;
-	cmp.eq p6,p7=r26,r18
+(p6)	cmp.eq p6,p7=r26,r18			// Only if page is present
 	;;
 (p6)	itc.d r25				// install updated PTE
 	/*
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index 8fd93afa75a7..e883d85906db 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -123,8 +123,9 @@ mca_page_isolate(unsigned long paddr)
 void
 mca_handler_bh(unsigned long paddr)
 {
-	printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n",
-		current->pid, current->comm);
+	printk(KERN_ERR
+		"OS_MCA: process [pid: %d](%s) encounters MCA (paddr=%lx)\n",
+		current->pid, current->comm, paddr);
 
 	spin_lock(&mca_bh_lock);
 	switch (mca_page_isolate(paddr)) {
@@ -132,7 +133,7 @@ mca_handler_bh(unsigned long paddr)
 		printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
 		break;
 	case ISOLATE_NG:
-		printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr);
+		printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr);
 		break;
 	default:
 		break;
@@ -567,10 +568,15 @@ recover_from_processor_error(int platform, slidx_table_t *slidx,
 		return 0;
 
 	/*
-	 * If there is no bus error, record is weird but we need not to recover.
+	 * The cache check and bus check bits have four possible states
+	 *   cc bc
+	 *    0  0	Weird record, not recovered
+	 *    1  0	Cache error, not recovered
+	 *    0  1	I/O error, attempt recovery
+	 *    1  1	Memory error, attempt recovery
 	 */
 	if (psp->bc == 0 || pbci == NULL)
-		return 1;
+		return 0;
 
 	/*
 	 * Sorry, we cannot handle so many.