3 files changed, 10 insertions, 4 deletions

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 79f8b39801a8..f6b6bfa88ecf 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -9,6 +9,7 @@
  *
  *  DMA uncached mapping support.
  */
+#include <linux/bootmem.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/gfp.h>
@@ -162,6 +163,8 @@ static u64 get_coherent_dma_mask(struct device *dev)
         u64 mask = (u64)DMA_BIT_MASK(32);
 
         if (dev) {
+                unsigned long max_dma_pfn;
+
                 mask = dev->coherent_dma_mask;
 
                 /*
@@ -173,6 +176,8 @@ static u64 get_coherent_dma_mask(struct device *dev)
                         return 0;
                 }
 
+                max_dma_pfn = min(max_pfn, arm_dma_pfn_limit);
+
                 /*
                  * If the mask allows for more memory than we can address,
                  * and we actually have that much memory, then fail the
@@ -180,7 +185,7 @@ static u64 get_coherent_dma_mask(struct device *dev)
                  */
                 if (sizeof(mask) != sizeof(dma_addr_t) &&
                     mask > (dma_addr_t)~0 &&
-                    dma_to_pfn(dev, ~0) > arm_dma_pfn_limit) {
+                    dma_to_pfn(dev, ~0) > max_dma_pfn) {
                         dev_warn(dev, "Coherent DMA mask %#llx is larger than dma_addr_t allows\n",
                                  mask);
                         dev_warn(dev, "Driver did not use or check the return value from dma_set_coherent_mask()?\n");
@@ -192,7 +197,7 @@ static u64 get_coherent_dma_mask(struct device *dev)
                  * fits within the allowable addresses which we can
                  * allocate.
                  */
-                if (dma_to_pfn(dev, mask) < arm_dma_pfn_limit) {
+                if (dma_to_pfn(dev, mask) < max_dma_pfn) {
                         dev_warn(dev, "Coherent DMA mask %#llx (pfn %#lx-%#lx) covers a smaller range of system memory than the DMA zone pfn 0x0-%#lx\n",
                                  mask,
                                  dma_to_pfn(dev, 0), dma_to_pfn(dev, mask) + 1,
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index d27158c38eb0..5e85ed371364 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -146,7 +146,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 
         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
         info.length = len;
-        info.low_limit = PAGE_SIZE;
+        info.low_limit = FIRST_USER_ADDRESS;
         info.high_limit = mm->mmap_base;
         info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
         info.align_offset = pgoff << PAGE_SHIFT;
diff --git a/arch/arm/mm/pgd.c b/arch/arm/mm/pgd.c
index 0acb089d0f70..1046b373d1ae 100644
--- a/arch/arm/mm/pgd.c
+++ b/arch/arm/mm/pgd.c
@@ -87,7 +87,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
                 init_pud = pud_offset(init_pgd, 0);
                 init_pmd = pmd_offset(init_pud, 0);
                 init_pte = pte_offset_map(init_pmd, 0);
-                set_pte_ext(new_pte, *init_pte, 0);
+                set_pte_ext(new_pte + 0, init_pte[0], 0);
+                set_pte_ext(new_pte + 1, init_pte[1], 0);
                 pte_unmap(init_pte);
                 pte_unmap(new_pte);
         }