5 files changed, 30 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 5355244c99f..60c60ccf5e3 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -195,8 +195,9 @@ __ftrace_make_nop(struct module *mod,
 		return -EINVAL;
 	}
 
-	offset = (unsigned)((unsigned short)jmp[0]) << 16 |
-		(unsigned)((unsigned short)jmp[1]);
+	/* The bottom half is signed extended */
+	offset = ((unsigned)((unsigned short)jmp[0]) << 16) +
+		(int)((short)jmp[1]);
 
 	DEBUGP(" %x ", offset);
 
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 23b8b5e36f9..17efb7118db 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -190,7 +190,7 @@ int show_interrupts(struct seq_file *p, void *v)
 		seq_printf(p, "%3d: ", i);
 #ifdef CONFIG_SMP
 		for_each_online_cpu(j)
-			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+			seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 #else
 		seq_printf(p, "%10u ", kstat_irqs(i));
 #endif /* CONFIG_SMP */
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index da5a3855a0c..0f418127231 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -16,8 +16,6 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#define DEBUG
-
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/string.h>
@@ -258,7 +256,8 @@ int pci_read_irq_line(struct pci_dev *pci_dev)
 	} else {
 		pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
 			 oirq.size, oirq.specifier[0], oirq.specifier[1],
-		    oirq.controller->full_name);
+			 oirq.controller ? oirq.controller->full_name :
+			 "<default>");
 
 		virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
 					     oirq.size);
@@ -562,8 +561,21 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus,
 		 (unsigned long long)(offset + size - 1));
 
 	if (mmap_state == pci_mmap_mem) {
-		if ((offset + size) > hose->isa_mem_size)
-			return -ENXIO;
+		/* Hack alert !
+		 *
+		 * Because X is lame and can fail starting if it gets an error trying
+		 * to mmap legacy_mem (instead of just moving on without legacy memory
+		 * access) we fake it here by giving it anonymous memory, effectively
+		 * behaving just like /dev/zero
+		 */
+		if ((offset + size) > hose->isa_mem_size) {
+			printk(KERN_DEBUG
+			       "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n",
+			       current->comm, current->pid, pci_domain_nr(bus), bus->number);
+			if (vma->vm_flags & VM_SHARED)
+				return shmem_zero_setup(vma);
+			return 0;
+		}
 		offset += hose->isa_mem_phys;
 	} else {
 		unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index c09cffafb6e..f00f83109ab 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -590,6 +590,11 @@ static void __init check_cpu_slb_size(unsigned long node)
 {
 	u32 *slb_size_ptr;
 
+	slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
+	if (slb_size_ptr != NULL) {
+		mmu_slb_size = *slb_size_ptr;
+		return;
+	}
 	slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 	if (slb_size_ptr != NULL) {
 		mmu_slb_size = *slb_size_ptr;
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 94aa7b011b2..d3694498f3a 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -492,14 +492,14 @@ static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
 	struct vio_dev *viodev = to_vio_dev(dev);
 	void *ret;
 
-	if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) {
+	if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
 		atomic_inc(&viodev->cmo.allocs_failed);
 		return NULL;
 	}
 
 	ret = dma_iommu_ops.alloc_coherent(dev, size, dma_handle, flag);
 	if (unlikely(ret == NULL)) {
-		vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
+		vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
 		atomic_inc(&viodev->cmo.allocs_failed);
 	}
 
@@ -513,7 +513,7 @@ static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
 
 	dma_iommu_ops.free_coherent(dev, size, vaddr, dma_handle);
 
-	vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
+	vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
 }
 
 static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
@@ -572,6 +572,7 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
 	if (unlikely(!ret)) {
 		vio_cmo_dealloc(viodev, alloc_size);
 		atomic_inc(&viodev->cmo.allocs_failed);
+		return ret;
 	}
 
 	for (sgl = sglist, count = 0; count < ret; count++, sgl++)