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.