9 files changed, 34 insertions, 75 deletions

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 4a5397bfce27..7f225a4b2a26 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -255,9 +255,11 @@ static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 
 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 {
-#ifdef CONFIG_X86_64
         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 
+        if (dma_mask <= DMA_24BIT_MASK)
+                gfp |= GFP_DMA;
+#ifdef CONFIG_X86_64
         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
                 gfp |= GFP_DMA32;
 #endif
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index c4ce0332759e..3c539d111abb 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -18,9 +18,21 @@ swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
         return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
 }
 
+static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+                                        dma_addr_t *dma_handle, gfp_t flags)
+{
+        void *vaddr;
+
+        vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags);
+        if (vaddr)
+                return vaddr;
+
+        return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
+}
+
 struct dma_mapping_ops swiotlb_dma_ops = {
         .mapping_error = swiotlb_dma_mapping_error,
-        .alloc_coherent = swiotlb_alloc_coherent,
+        .alloc_coherent = x86_swiotlb_alloc_coherent,
         .free_coherent = swiotlb_free_coherent,
         .map_single = swiotlb_map_single_phys,
         .unmap_single = swiotlb_unmap_single,
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 9ce1ab6c268d..1e3b934a4cf7 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -774,7 +774,7 @@ void xen_poll_irq(int irq)
 
                 poll.nr_ports = 1;
                 poll.timeout = 0;
-                poll.ports = &evtchn;
+                set_xen_guest_handle(poll.ports, &evtchn);
 
                 if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
                         BUG();
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index d0e87cbe157c..9b91617b9582 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -39,8 +39,6 @@ static int xen_suspend(void *data)
 
         BUG_ON(!irqs_disabled());
 
-        load_cr3(swapper_pg_dir);
-
         err = device_power_down(PMSG_SUSPEND);
         if (err) {
                 printk(KERN_ERR "xen_suspend: device_power_down failed: %d\n",
diff --git a/drivers/xen/xencomm.c b/drivers/xen/xencomm.c
index 797cb4e31f07..a240b2c20b99 100644
--- a/drivers/xen/xencomm.c
+++ b/drivers/xen/xencomm.c
@@ -23,13 +23,7 @@
 #include <asm/page.h>
 #include <xen/xencomm.h>
 #include <xen/interface/xen.h>
-#ifdef __ia64__
-#include <asm/xen/xencomm.h>    /* for is_kern_addr() */
-#endif
-
-#ifdef HAVE_XEN_PLATFORM_COMPAT_H
-#include <xen/platform-compat.h>
-#endif
+#include <asm/xen/xencomm.h>    /* for xencomm_is_phys_contiguous() */
 
 static int xencomm_init(struct xencomm_desc *desc,
                         void *buffer, unsigned long bytes)
@@ -157,20 +151,11 @@ static int xencomm_create(void *buffer, unsigned long bytes,
         return 0;
 }
 
-/* check if memory address is within VMALLOC region  */
-static int is_phys_contiguous(unsigned long addr)
-{
-        if (!is_kernel_addr(addr))
-                return 0;
-
-        return (addr < VMALLOC_START) || (addr >= VMALLOC_END);
-}
-
 static struct xencomm_handle *xencomm_create_inline(void *ptr)
 {
         unsigned long paddr;
 
-        BUG_ON(!is_phys_contiguous((unsigned long)ptr));
+        BUG_ON(!xencomm_is_phys_contiguous((unsigned long)ptr));
 
         paddr = (unsigned long)xencomm_pa(ptr);
         BUG_ON(paddr & XENCOMM_INLINE_FLAG);
@@ -202,7 +187,7 @@ struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes)
         int rc;
         struct xencomm_desc *desc;
 
-        if (is_phys_contiguous((unsigned long)ptr))
+        if (xencomm_is_phys_contiguous((unsigned long)ptr))
                 return xencomm_create_inline(ptr);
 
         rc = xencomm_create(ptr, bytes, &desc, GFP_KERNEL);
@@ -219,7 +204,7 @@ struct xencomm_handle *__xencomm_map_no_alloc(void *ptr, unsigned long bytes,
         int rc;
         struct xencomm_desc *desc = NULL;
 
-        if (is_phys_contiguous((unsigned long)ptr))
+        if (xencomm_is_phys_contiguous((unsigned long)ptr))
                 return xencomm_create_inline(ptr);
 
         rc = xencomm_create_mini(ptr, bytes, xc_desc,
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index dbda475b13bd..06e157119d2b 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2169,12 +2169,11 @@ void early_boot_irqs_on(void)
 /*
  * Hardirqs will be enabled:
  */
-void trace_hardirqs_on_caller(unsigned long a0)
+void trace_hardirqs_on_caller(unsigned long ip)
 {
         struct task_struct *curr = current;
-        unsigned long ip;
 
-        time_hardirqs_on(CALLER_ADDR0, a0);
+        time_hardirqs_on(CALLER_ADDR0, ip);
 
         if (unlikely(!debug_locks || current->lockdep_recursion))
                 return;
@@ -2188,7 +2187,6 @@ void trace_hardirqs_on_caller(unsigned long a0)
         }
         /* we'll do an OFF -> ON transition: */
         curr->hardirqs_enabled = 1;
-        ip = (unsigned long) __builtin_return_address(0);
 
         if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
                 return;
@@ -2224,11 +2222,11 @@ EXPORT_SYMBOL(trace_hardirqs_on);
 /*
  * Hardirqs were disabled:
  */
-void trace_hardirqs_off_caller(unsigned long a0)
+void trace_hardirqs_off_caller(unsigned long ip)
 {
         struct task_struct *curr = current;
 
-        time_hardirqs_off(CALLER_ADDR0, a0);
+        time_hardirqs_off(CALLER_ADDR0, ip);
 
         if (unlikely(!debug_locks || current->lockdep_recursion))
                 return;
@@ -2241,7 +2239,7 @@ void trace_hardirqs_off_caller(unsigned long a0)
                  * We have done an ON -> OFF transition:
                  */
                 curr->hardirqs_enabled = 0;
-                curr->hardirq_disable_ip = _RET_IP_;
+                curr->hardirq_disable_ip = ip;
                 curr->hardirq_disable_event = ++curr->irq_events;
                 debug_atomic_inc(&hardirqs_off_events);
         } else
@@ -3417,9 +3415,10 @@ retry:
                 }
                 printk(" ignoring it.\n");
                 unlock = 0;
+        } else {
+                if (count != 10)
+                        printk(KERN_CONT " locked it.\n");
         }
-        if (count != 10)
-                printk(" locked it.\n");
 
         do_each_thread(g, p) {
                 /*
diff --git a/kernel/printk.c b/kernel/printk.c
index 6341af77eb65..f492f1583d77 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -233,45 +233,6 @@ static inline void boot_delay_msec(void)
 #endif
 
 /*
- * Return the number of unread characters in the log buffer.
- */
-static int log_buf_get_len(void)
-{
-        return logged_chars;
-}
-
-/*
- * Copy a range of characters from the log buffer.
- */
-int log_buf_copy(char *dest, int idx, int len)
-{
-        int ret, max;
-        bool took_lock = false;
-
-        if (!oops_in_progress) {
-                spin_lock_irq(&logbuf_lock);
-                took_lock = true;
-        }
-
-        max = log_buf_get_len();
-        if (idx < 0 || idx >= max) {
-                ret = -1;
-        } else {
-                if (len > max)
-                        len = max;
-                ret = len;
-                idx += (log_end - max);
-                while (len-- > 0)
-                        dest[len] = LOG_BUF(idx + len);
-        }
-
-        if (took_lock)
-                spin_unlock_irq(&logbuf_lock);
-
-        return ret;
-}
-
-/*
  * Commands to do_syslog:
  *
  *      0 -- Close the log.  Currently a NOP.
diff --git a/kernel/resource.c b/kernel/resource.c
index 4089d12af6e0..7fec0e427234 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -571,7 +571,7 @@ static void __init __reserve_region_with_split(struct resource *root,
 
 }
 
-void reserve_region_with_split(struct resource *root,
+void __init reserve_region_with_split(struct resource *root,
                 resource_size_t start, resource_size_t end,
                 const char *name)
 {
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index f8eebd489149..78330c37a61b 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -497,8 +497,10 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
                        (unsigned long long)*hwdev->dma_mask,
                        (unsigned long long)dev_addr);
-                panic("swiotlb_alloc_coherent: allocated memory is out of "
-                      "range for device");
+
+                /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
+                unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
+                return NULL;
         }
         *dma_handle = dev_addr;
         return ret;