4 files changed, 66 insertions, 37 deletions

diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 4ba373c5b8c8..be54176e9eb2 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -233,7 +233,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
         len = (unsigned long) nr_pages << PAGE_SHIFT;
         end = start + len;
         if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
-                                        start, len)))
+                                        (void __user *)start, len)))
                 goto slow_irqon;
 
         /*
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b8e461d49412..9db01db6e3cd 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -350,8 +350,10 @@ phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
                  * pagetable pages as RO. So assume someone who pre-setup
                  * these mappings are more intelligent.
                  */
-                if (pte_val(*pte))
+                if (pte_val(*pte)) {
+                        pages++;
                         continue;
+                }
 
                 if (0)
                         printk("   pte=%p addr=%lx pte=%016lx\n",
@@ -418,8 +420,10 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
                          * not differ with respect to page frame and
                          * attributes.
                          */
-                        if (page_size_mask & (1 << PG_LEVEL_2M))
+                        if (page_size_mask & (1 << PG_LEVEL_2M)) {
+                                pages++;
                                 continue;
+                        }
                         new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
                 }
 
@@ -499,8 +503,10 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
                          * not differ with respect to page frame and
                          * attributes.
                          */
-                        if (page_size_mask & (1 << PG_LEVEL_1G))
+                        if (page_size_mask & (1 << PG_LEVEL_1G)) {
+                                pages++;
                                 continue;
+                        }
                         prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
                 }
 
@@ -665,12 +671,13 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         unsigned long last_map_addr = 0;
         unsigned long page_size_mask = 0;
         unsigned long start_pfn, end_pfn;
+        unsigned long pos;
 
         struct map_range mr[NR_RANGE_MR];
         int nr_range, i;
         int use_pse, use_gbpages;
 
-        printk(KERN_INFO "init_memory_mapping\n");
+        printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
 
         /*
          * Find space for the kernel direct mapping tables.
@@ -704,35 +711,50 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 
         /* head if not big page alignment ?*/
         start_pfn = start >> PAGE_SHIFT;
-        end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT)
+        pos = start_pfn << PAGE_SHIFT;
+        end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
                         << (PMD_SHIFT - PAGE_SHIFT);
-        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
+        if (start_pfn < end_pfn) {
+                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
+                pos = end_pfn << PAGE_SHIFT;
+        }
 
         /* big page (2M) range*/
-        start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+        start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
                          << (PMD_SHIFT - PAGE_SHIFT);
-        end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT)
+        end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
                          << (PUD_SHIFT - PAGE_SHIFT);
-        if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)))
-                end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT));
-        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                        page_size_mask & (1<<PG_LEVEL_2M));
+        if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
+                end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
+        if (start_pfn < end_pfn) {
+                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+                                page_size_mask & (1<<PG_LEVEL_2M));
+                pos = end_pfn << PAGE_SHIFT;
+        }
 
         /* big page (1G) range */
-        start_pfn = end_pfn;
-        end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
-        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+        start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
+                         << (PUD_SHIFT - PAGE_SHIFT);
+        end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
+        if (start_pfn < end_pfn) {
+                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
                                 page_size_mask &
                                  ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
+                pos = end_pfn << PAGE_SHIFT;
+        }
 
         /* tail is not big page (1G) alignment */
-        start_pfn = end_pfn;
-        end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
-        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                        page_size_mask & (1<<PG_LEVEL_2M));
+        start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
+                         << (PMD_SHIFT - PAGE_SHIFT);
+        end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+        if (start_pfn < end_pfn) {
+                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+                                page_size_mask & (1<<PG_LEVEL_2M));
+                pos = end_pfn << PAGE_SHIFT;
+        }
 
         /* tail is not big page (2M) alignment */
-        start_pfn = end_pfn;
+        start_pfn = pos>>PAGE_SHIFT;
         end_pfn = end>>PAGE_SHIFT;
         nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
 
@@ -831,12 +853,12 @@ int arch_add_memory(int nid, u64 start, u64 size)
         unsigned long nr_pages = size >> PAGE_SHIFT;
         int ret;
 
-        last_mapped_pfn = init_memory_mapping(start, start + size-1);
+        last_mapped_pfn = init_memory_mapping(start, start + size);
         if (last_mapped_pfn > max_pfn_mapped)
                 max_pfn_mapped = last_mapped_pfn;
 
         ret = __add_pages(zone, start_pfn, nr_pages);
-        WARN_ON(1);
+        WARN_ON_ONCE(ret);
 
         return ret;
 }
@@ -878,6 +900,7 @@ static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
 void __init mem_init(void)
 {
         long codesize, reservedpages, datasize, initsize;
+        unsigned long absent_pages;
 
         start_periodic_check_for_corruption();
 
@@ -893,8 +916,9 @@ void __init mem_init(void)
 #else
         totalram_pages = free_all_bootmem();
 #endif
-        reservedpages = max_pfn - totalram_pages -
-                                        absent_pages_in_range(0, max_pfn);
+
+        absent_pages = absent_pages_in_range(0, max_pfn);
+        reservedpages = max_pfn - totalram_pages - absent_pages;
         after_bootmem = 1;
 
         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
@@ -911,10 +935,11 @@ void __init mem_init(void)
                                  VSYSCALL_END - VSYSCALL_START);
 
         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
-                                "%ldk reserved, %ldk data, %ldk init)\n",
+                         "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
                 max_pfn << (PAGE_SHIFT-10),
                 codesize >> 10,
+                absent_pages << (PAGE_SHIFT-10),
                 reservedpages << (PAGE_SHIFT-10),
                 datasize >> 10,
                 initsize >> 10);
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index ae71e11eb3e5..d4c4307ff3e0 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -387,7 +387,7 @@ static void __iomem *ioremap_default(resource_size_t phys_addr,
                                         unsigned long size)
 {
         unsigned long flags;
-        void *ret;
+        void __iomem *ret;
         int err;
 
         /*
@@ -399,11 +399,11 @@ static void __iomem *ioremap_default(resource_size_t phys_addr,
         if (err < 0)
                 return NULL;
 
-        ret = (void *) __ioremap_caller(phys_addr, size, flags,
-                                        __builtin_return_address(0));
+        ret = __ioremap_caller(phys_addr, size, flags,
+                               __builtin_return_address(0));
 
         free_memtype(phys_addr, phys_addr + size);
-        return (void __iomem *)ret;
+        return ret;
 }
 
 void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
@@ -622,7 +622,7 @@ static inline void __init early_clear_fixmap(enum fixed_addresses idx)
                 __early_set_fixmap(idx, 0, __pgprot(0));
 }
 
-static void *prev_map[FIX_BTMAPS_SLOTS] __initdata;
+static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
 static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
 static int __init check_early_ioremap_leak(void)
 {
@@ -645,7 +645,7 @@ static int __init check_early_ioremap_leak(void)
 }
 late_initcall(check_early_ioremap_leak);
 
-static void __init *__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
+static void __init __iomem *__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
 {
         unsigned long offset, last_addr;
         unsigned int nrpages;
@@ -713,23 +713,23 @@ static void __init *__early_ioremap(unsigned long phys_addr, unsigned long size,
         if (early_ioremap_debug)
                 printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
 
-        prev_map[slot] = (void *) (offset + fix_to_virt(idx0));
+        prev_map[slot] = (void __iomem *)(offset + fix_to_virt(idx0));
         return prev_map[slot];
 }
 
 /* Remap an IO device */
-void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
+void __init __iomem *early_ioremap(unsigned long phys_addr, unsigned long size)
 {
         return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO);
 }
 
 /* Remap memory */
-void __init *early_memremap(unsigned long phys_addr, unsigned long size)
+void __init __iomem *early_memremap(unsigned long phys_addr, unsigned long size)
 {
         return __early_ioremap(phys_addr, size, PAGE_KERNEL);
 }
 
-void __init early_iounmap(void *addr, unsigned long size)
+void __init early_iounmap(void __iomem *addr, unsigned long size)
 {
         unsigned long virt_addr;
         unsigned long offset;
@@ -779,7 +779,7 @@ void __init early_iounmap(void *addr, unsigned long size)
                 --idx;
                 --nrpages;
         }
-        prev_map[slot] = 0;
+        prev_map[slot] = NULL;
 }
 
 void __this_fixmap_does_not_exist(void)
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 738fd0f24958..eb1bf000d12e 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -481,12 +481,16 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
         return 1;
 }
 #else
+/* This check is needed to avoid cache aliasing when PAT is enabled */
 static inline int range_is_allowed(unsigned long pfn, unsigned long size)
 {
         u64 from = ((u64)pfn) << PAGE_SHIFT;
         u64 to = from + size;
         u64 cursor = from;
 
+        if (!pat_enabled)
+                return 1;
+
         while (cursor < to) {
                 if (!devmem_is_allowed(pfn)) {
                         printk(KERN_INFO