Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=14a62c34b134d24f7fedb8fd66028ecdcffb32c8
Commit:     14a62c34b134d24f7fedb8fd66028ecdcffb32c8
Parent:     a3828064be4ed8e95907d3943e7af13cb709694d
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:34:10 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:34:10 2008 +0100

    x86: unify ioremap
    
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 arch/x86/mm/init_64.c |  301 ++++++++++++++++++++++++++++---------------------
 1 files changed, 175 insertions(+), 126 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 8a7b725..bb732bb 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -47,10 +47,10 @@
 #include <asm/numa.h>
 
 #ifndef Dprintk
-#define Dprintk(x...)
+# define Dprintk(x...)
 #endif
 
-const struct dma_mapping_ops* dma_ops;
+const struct dma_mapping_ops *dma_ops;
 EXPORT_SYMBOL(dma_ops);
 
 static unsigned long dma_reserve __initdata;
@@ -67,22 +67,26 @@ void show_mem(void)
 {
        long i, total = 0, reserved = 0;
        long shared = 0, cached = 0;
-       pg_data_t *pgdat;
        struct page *page;
+       pg_data_t *pgdat;
 
        printk(KERN_INFO "Mem-info:\n");
        show_free_areas();
-       printk(KERN_INFO "Free swap:       %6ldkB\n", 
nr_swap_pages<<(PAGE_SHIFT-10));
+       printk(KERN_INFO "Free swap:       %6ldkB\n",
+               nr_swap_pages << (PAGE_SHIFT-10));
 
        for_each_online_pgdat(pgdat) {
-               for (i = 0; i < pgdat->node_spanned_pages; ++i) {
-                       /* this loop can take a while with 256 GB and 4k pages
-                          so update the NMI watchdog */
-                       if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) {
+               for (i = 0; i < pgdat->node_spanned_pages; ++i) {
+                       /*
+                        * This loop can take a while with 256 GB and
+                        * 4k pages so defer the NMI watchdog:
+                        */
+                       if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
                                touch_nmi_watchdog();
-                       }
+
                        if (!pfn_valid(pgdat->node_start_pfn + i))
                                continue;
+
                        page = pfn_to_page(pgdat->node_start_pfn + i);
                        total++;
                        if (PageReserved(page))
@@ -91,32 +95,37 @@ void show_mem(void)
                                cached++;
                        else if (page_count(page))
                                shared += page_count(page) - 1;
-               }
+               }
        }
-       printk(KERN_INFO "%lu pages of RAM\n", total);
-       printk(KERN_INFO "%lu reserved pages\n",reserved);
-       printk(KERN_INFO "%lu pages shared\n",shared);
-       printk(KERN_INFO "%lu pages swap cached\n",cached);
+       printk(KERN_INFO "%lu pages of RAM\n",          total);
+       printk(KERN_INFO "%lu reserved pages\n",        reserved);
+       printk(KERN_INFO "%lu pages shared\n",          shared);
+       printk(KERN_INFO "%lu pages swap cached\n",     cached);
 }
 
 int after_bootmem;
 
 static __init void *spp_getpage(void)
-{ 
+{
        void *ptr;
+
        if (after_bootmem)
-               ptr = (void *) get_zeroed_page(GFP_ATOMIC); 
+               ptr = (void *) get_zeroed_page(GFP_ATOMIC);
        else
                ptr = alloc_bootmem_pages(PAGE_SIZE);
-       if (!ptr || ((unsigned long)ptr & ~PAGE_MASK))
-               panic("set_pte_phys: cannot allocate page data %s\n", 
after_bootmem?"after bootmem":"");
+
+       if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
+               panic("set_pte_phys: cannot allocate page data %s\n",
+                       after_bootmem ? "after bootmem" : "");
+       }
 
        Dprintk("spp_getpage %p\n", ptr);
+
        return ptr;
-} 
+}
 
-static __init void set_pte_phys(unsigned long vaddr,
-                        unsigned long phys, pgprot_t prot)
+static __init void
+set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
 {
        pgd_t *pgd;
        pud_t *pud;
@@ -132,10 +141,11 @@ static __init void set_pte_phys(unsigned long vaddr,
        }
        pud = pud_offset(pgd, vaddr);
        if (pud_none(*pud)) {
-               pmd = (pmd_t *) spp_getpage(); 
+               pmd = (pmd_t *) spp_getpage();
                set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
                if (pmd != pmd_offset(pud, 0)) {
-                       printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, 
pmd_offset(pud,0));
+                       printk("PAGETABLE BUG #01! %p <-> %p\n",
+                               pmd, pmd_offset(pud, 0));
                        return;
                }
        }
@@ -164,8 +174,8 @@ static __init void set_pte_phys(unsigned long vaddr,
 }
 
 /* NOTE: this is meant to be run only at boot */
-void __init 
-__set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
+void __init
+__set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 {
        unsigned long address = __fix_to_virt(idx);
 
@@ -180,18 +190,19 @@ static unsigned long __initdata table_start;
 static unsigned long __meminitdata table_end;
 
 static __meminit void *alloc_low_page(unsigned long *phys)
-{ 
+{
        unsigned long pfn = table_end++;
        void *adr;
 
        if (after_bootmem) {
                adr = (void *)get_zeroed_page(GFP_ATOMIC);
                *phys = __pa(adr);
+
                return adr;
        }
 
-       if (pfn >= end_pfn) 
-               panic("alloc_low_page: ran out of memory"); 
+       if (pfn >= end_pfn)
+               panic("alloc_low_page: ran out of memory");
 
        adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
        memset(adr, 0, PAGE_SIZE);
@@ -200,44 +211,49 @@ static __meminit void *alloc_low_page(unsigned long *phys)
 }
 
 static __meminit void unmap_low_page(void *adr)
-{ 
-
+{
        if (after_bootmem)
                return;
 
        early_iounmap(adr, PAGE_SIZE);
-} 
+}
 
 /* Must run before zap_low_mappings */
 __meminit void *early_ioremap(unsigned long addr, unsigned long size)
 {
-       unsigned long vaddr;
        pmd_t *pmd, *last_pmd;
+       unsigned long vaddr;
        int i, pmds;
 
        pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
        vaddr = __START_KERNEL_map;
        pmd = level2_kernel_pgt;
        last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
+
        for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
                for (i = 0; i < pmds; i++) {
                        if (pmd_present(pmd[i]))
-                               goto next;
+                               goto continue_outer_loop;
                }
                vaddr += addr & ~PMD_MASK;
                addr &= PMD_MASK;
+
                for (i = 0; i < pmds; i++, addr += PMD_SIZE)
                        set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
                __flush_tlb_all();
+
                return (void *)vaddr;
-       next:
+continue_outer_loop:
                ;
        }
        printk("early_ioremap(0x%lx, %lu) failed\n", addr, size);
+
        return NULL;
 }
 
-/* To avoid virtual aliases later */
+/*
+ * To avoid virtual aliases later:
+ */
 __meminit void early_iounmap(void *addr, unsigned long size)
 {
        unsigned long vaddr;
@@ -247,8 +263,10 @@ __meminit void early_iounmap(void *addr, unsigned long 
size)
        vaddr = (unsigned long)addr;
        pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
        pmd = level2_kernel_pgt + pmd_index(vaddr);
+
        for (i = 0; i < pmds; i++)
                pmd_clear(pmd + i);
+
        __flush_tlb_all();
 }
 
@@ -262,9 +280,10 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, 
unsigned long end)
                pmd_t *pmd = pmd_page + pmd_index(address);
 
                if (address >= end) {
-                       if (!after_bootmem)
+                       if (!after_bootmem) {
                                for (; i < PTRS_PER_PMD; i++, pmd++)
                                        set_pmd(pmd, __pmd(0));
+                       }
                        break;
                }
 
@@ -280,19 +299,19 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, 
unsigned long end)
 static void __meminit
 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
 {
-       pmd_t *pmd = pmd_offset(pud,0);
+       pmd_t *pmd = pmd_offset(pud, 0);
        spin_lock(&init_mm.page_table_lock);
        phys_pmd_init(pmd, address, end);
        spin_unlock(&init_mm.page_table_lock);
        __flush_tlb_all();
 }
 
-static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, 
unsigned long end)
-{ 
+static void __meminit
+phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
+{
        int i = pud_index(addr);
 
-
-       for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) {
+       for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
                unsigned long pmd_phys;
                pud_t *pud = pud_page + pud_index(addr);
                pmd_t *pmd;
@@ -300,10 +319,11 @@ static void __meminit phys_pud_init(pud_t *pud_page, 
unsigned long addr, unsigne
                if (addr >= end)
                        break;
 
-               if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) {
-                       set_pud(pud, __pud(0)); 
+               if (!after_bootmem &&
+                               !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
+                       set_pud(pud, __pud(0));
                        continue;
-               } 
+               }
 
                if (pud_val(*pud)) {
                        phys_pmd_update(pud, addr, end);
@@ -311,14 +331,16 @@ static void __meminit phys_pud_init(pud_t *pud_page, 
unsigned long addr, unsigne
                }
 
                pmd = alloc_low_page(&pmd_phys);
+
                spin_lock(&init_mm.page_table_lock);
                set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
                phys_pmd_init(pmd, addr, end);
                spin_unlock(&init_mm.page_table_lock);
+
                unmap_low_page(pmd);
        }
        __flush_tlb_all();
-} 
+}
 
 static void __init find_early_table_space(unsigned long end)
 {
@@ -329,11 +351,13 @@ static void __init find_early_table_space(unsigned long 
end)
        tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
                 round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
 
-       /* RED-PEN putting page tables only on node 0 could
-          cause a hotspot and fill up ZONE_DMA. The page tables
-          need roughly 0.5KB per GB. */
-       start = 0x8000;
-       table_start = find_e820_area(start, end, tables);
+       /*
+        * RED-PEN putting page tables only on node 0 could
+        * cause a hotspot and fill up ZONE_DMA. The page tables
+        * need roughly 0.5KB per GB.
+        */
+       start = 0x8000;
+       table_start = find_e820_area(start, end, tables);
        if (table_start == -1UL)
                panic("Cannot find space for the kernel page tables");
 
@@ -345,20 +369,23 @@ static void __init find_early_table_space(unsigned long 
end)
                (table_start << PAGE_SHIFT) + tables);
 }
 
-/* Setup the direct mapping of the physical memory at PAGE_OFFSET.
-   This runs before bootmem is initialized and gets pages directly from the 
-   physical memory. To access them they are temporarily mapped. */
+/*
+ * Setup the direct mapping of the physical memory at PAGE_OFFSET.
+ * This runs before bootmem is initialized and gets pages directly from
+ * the physical memory. To access them they are temporarily mapped.
+ */
 void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
-{ 
-       unsigned long next; 
+{
+       unsigned long next;
 
        Dprintk("init_memory_mapping\n");
 
-       /* 
+       /*
         * Find space for the kernel direct mapping tables.
-        * Later we should allocate these tables in the local node of the memory
-        * mapped.  Unfortunately this is done currently before the nodes are 
-        * discovered.
+        *
+        * Later we should allocate these tables in the local node of the
+        * memory mapped. Unfortunately this is done currently before the
+        * nodes are discovered.
         */
        if (!after_bootmem)
                find_early_table_space(end);
@@ -367,8 +394,8 @@ void __init_refok init_memory_mapping(unsigned long start, 
unsigned long end)
        end = (unsigned long)__va(end);
 
        for (; start < end; start = next) {
-               unsigned long pud_phys; 
                pgd_t *pgd = pgd_offset_k(start);
+               unsigned long pud_phys;
                pud_t *pud;
 
                if (after_bootmem)
@@ -377,13 +404,13 @@ void __init_refok init_memory_mapping(unsigned long 
start, unsigned long end)
                        pud = alloc_low_page(&pud_phys);
 
                next = start + PGDIR_SIZE;
-               if (next > end) 
-                       next = end; 
+               if (next > end)
+                       next = end;
                phys_pud_init(pud, __pa(start), __pa(next));
                if (!after_bootmem)
                        set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
                unmap_low_page(pud);
-       } 
+       }
 
        if (!after_bootmem)
                mmu_cr4_features = read_cr4();
@@ -396,6 +423,7 @@ void __init_refok init_memory_mapping(unsigned long start, 
unsigned long end)
 void __init paging_init(void)
 {
        unsigned long max_zone_pfns[MAX_NR_ZONES];
+
        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
        max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
        max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
@@ -407,39 +435,48 @@ void __init paging_init(void)
 }
 #endif
 
-/* Unmap a kernel mapping if it exists. This is useful to avoid prefetches
-   from the CPU leading to inconsistent cache lines. address and size
-   must be aligned to 2MB boundaries. 
-   Does nothing when the mapping doesn't exist. */
-void __init clear_kernel_mapping(unsigned long address, unsigned long size) 
+/*
+ * Unmap a kernel mapping if it exists. This is useful to avoid
+ * prefetches from the CPU leading to inconsistent cache lines.
+ * address and size must be aligned to 2MB boundaries.
+ * Does nothing when the mapping doesn't exist.
+ */
+void __init clear_kernel_mapping(unsigned long address, unsigned long size)
 {
        unsigned long end = address + size;
 
        BUG_ON(address & ~LARGE_PAGE_MASK);
-       BUG_ON(size & ~LARGE_PAGE_MASK); 
-       
-       for (; address < end; address += LARGE_PAGE_SIZE) { 
+       BUG_ON(size & ~LARGE_PAGE_MASK);
+
+       for (; address < end; address += LARGE_PAGE_SIZE) {
                pgd_t *pgd = pgd_offset_k(address);
                pud_t *pud;
                pmd_t *pmd;
+
                if (pgd_none(*pgd))
                        continue;
+
                pud = pud_offset(pgd, address);
                if (pud_none(*pud))
-                       continue; 
+                       continue;
+
                pmd = pmd_offset(pud, address);
                if (!pmd || pmd_none(*pmd))
-                       continue; 
-               if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { 
-                       /* Could handle this, but it should not happen 
currently. */
-                       printk(KERN_ERR 
-              "clear_kernel_mapping: mapping has been split. will leak 
memory\n"); 
-                       pmd_ERROR(*pmd); 
+                       continue;
+
+               if (!(pmd_val(*pmd) & _PAGE_PSE)) {
+                       /*
+                        * Could handle this, but it should not happen
+                        * currently:
+                        */
+                       printk(KERN_ERR "clear_kernel_mapping: "
+                               "mapping has been split. will leak memory\n");
+                       pmd_ERROR(*pmd);
                }
-               set_pmd(pmd, __pmd(0));                 
+               set_pmd(pmd, __pmd(0));
        }
        __flush_tlb_all();
-} 
+}
 
 /*
  * Memory hotplug specific functions
@@ -466,16 +503,13 @@ int arch_add_memory(int nid, u64 start, u64 size)
        unsigned long nr_pages = size >> PAGE_SHIFT;
        int ret;
 
-       init_memory_mapping(start, (start + size -1));
+       init_memory_mapping(start, start + size-1);
 
        ret = __add_pages(zone, start_pfn, nr_pages);
        if (ret)
-               goto error;
+               printk("%s: Problem encountered in __add_pages!\n", __func__);
 
        return ret;
-error:
-       printk("%s: Problem encountered in __add_pages!\n", __func__);
-       return ret;
 }
 EXPORT_SYMBOL_GPL(arch_add_memory);
 
@@ -489,8 +523,8 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
-                        kcore_vsyscall;
+static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
+                        kcore_modules, kcore_vsyscall;
 
 void __init mem_init(void)
 {
@@ -518,7 +552,6 @@ void __init mem_init(void)
 #endif
        reservedpages = end_pfn - totalram_pages -
                                        absent_pages_in_range(0, end_pfn);
-
        after_bootmem = 1;
 
        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
@@ -526,15 +559,16 @@ void __init mem_init(void)
        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
        /* Register memory areas for /proc/kcore */
-       kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 
-       kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 
+       kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+       kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
                   VMALLOC_END-VMALLOC_START);
        kclist_add(&kcore_kernel, &_stext, _end - _stext);
        kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
-       kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, 
+       kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
                                 VSYSCALL_END - VSYSCALL_START);
 
-       printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, 
%ldk data, %ldk init)\n",
+       printk("Memory: %luk/%luk available (%ldk kernel code, "
+                               "%ldk reserved, %ldk data, %ldk init)\n",
                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
                end_pfn << (PAGE_SHIFT-10),
                codesize >> 10,
@@ -561,6 +595,7 @@ void free_init_pages(char *what, unsigned long begin, 
unsigned long end)
        set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
 #else
        printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
+
        for (addr = begin; addr < end; addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
@@ -596,7 +631,7 @@ void mark_rodata_ro(void)
 #ifdef CONFIG_KPROBES
        start = (unsigned long)__start_rodata;
 #endif
-       
+
        end = (unsigned long)__end_rodata;
        start = (start + PAGE_SIZE - 1) & PAGE_MASK;
        end &= PAGE_MASK;
@@ -627,17 +662,21 @@ void free_initrd_mem(unsigned long start, unsigned long 
end)
 }
 #endif
 
-void __init reserve_bootmem_generic(unsigned long phys, unsigned len) 
-{ 
+void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
+{
 #ifdef CONFIG_NUMA
        int nid = phys_to_nid(phys);
 #endif
        unsigned long pfn = phys >> PAGE_SHIFT;
+
        if (pfn >= end_pfn) {
-               /* This can happen with kdump kernels when accessing firmware
-                  tables. */
+               /*
+                * This can happen with kdump kernels when accessing
+                * firmware tables:
+                */
                if (pfn < end_pfn_map)
                        return;
+
                printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
                                phys, len);
                return;
@@ -645,9 +684,9 @@ void __init reserve_bootmem_generic(unsigned long phys, 
unsigned len)
 
        /* Should check here against the e820 map to avoid double free */
 #ifdef CONFIG_NUMA
-       reserve_bootmem_node(NODE_DATA(nid), phys, len);
-#else                  
-       reserve_bootmem(phys, len);    
+       reserve_bootmem_node(NODE_DATA(nid), phys, len);
+#else
+       reserve_bootmem(phys, len);
 #endif
        if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
                dma_reserve += len / PAGE_SIZE;
@@ -655,46 +694,49 @@ void __init reserve_bootmem_generic(unsigned long phys, 
unsigned len)
        }
 }
 
-int kern_addr_valid(unsigned long addr) 
-{ 
+int kern_addr_valid(unsigned long addr)
+{
        unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
-       pgd_t *pgd;
-       pud_t *pud;
-       pmd_t *pmd;
-       pte_t *pte;
+       pgd_t *pgd;
+       pud_t *pud;
+       pmd_t *pmd;
+       pte_t *pte;
 
        if (above != 0 && above != -1UL)
-               return 0; 
-       
+               return 0;
+
        pgd = pgd_offset_k(addr);
        if (pgd_none(*pgd))
                return 0;
 
        pud = pud_offset(pgd, addr);
        if (pud_none(*pud))
-               return 0; 
+               return 0;
 
        pmd = pmd_offset(pud, addr);
        if (pmd_none(*pmd))
                return 0;
+
        if (pmd_large(*pmd))
                return pfn_valid(pmd_pfn(*pmd));
 
        pte = pte_offset_kernel(pmd, addr);
        if (pte_none(*pte))
                return 0;
+
        return pfn_valid(pte_pfn(*pte));
 }
 
-/* A pseudo VMA to allow ptrace access for the vsyscall page.  This only
-   covers the 64bit vsyscall page now. 32bit has a real VMA now and does
-   not need special handling anymore. */
-
+/*
+ * A pseudo VMA to allow ptrace access for the vsyscall page.  This only
+ * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
+ * not need special handling anymore:
+ */
 static struct vm_area_struct gate_vma = {
-       .vm_start = VSYSCALL_START,
-       .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT),
-       .vm_page_prot = PAGE_READONLY_EXEC,
-       .vm_flags = VM_READ | VM_EXEC
+       .vm_start       = VSYSCALL_START,
+       .vm_end         = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
+       .vm_page_prot   = PAGE_READONLY_EXEC,
+       .vm_flags       = VM_READ | VM_EXEC
 };
 
 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
@@ -709,14 +751,17 @@ struct vm_area_struct *get_gate_vma(struct task_struct 
*tsk)
 int in_gate_area(struct task_struct *task, unsigned long addr)
 {
        struct vm_area_struct *vma = get_gate_vma(task);
+
        if (!vma)
                return 0;
+
        return (addr >= vma->vm_start) && (addr < vma->vm_end);
 }
 
-/* Use this when you have no reliable task/vma, typically from interrupt
- * context.  It is less reliable than using the task's vma and may give
- * false positives.
+/*
+ * Use this when you have no reliable task/vma, typically from interrupt
+ * context. It is less reliable than using the task's vma and may give
+ * false positives:
  */
 int in_gate_area_no_task(unsigned long addr)
 {
@@ -736,8 +781,8 @@ const char *arch_vma_name(struct vm_area_struct *vma)
 /*
  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
  */
-int __meminit vmemmap_populate(struct page *start_page,
-                                               unsigned long size, int node)
+int __meminit
+vmemmap_populate(struct page *start_page, unsigned long size, int node)
 {
        unsigned long addr = (unsigned long)start_page;
        unsigned long end = (unsigned long)(start_page + size);
@@ -752,6 +797,7 @@ int __meminit vmemmap_populate(struct page *start_page,
                pgd = vmemmap_pgd_populate(addr, node);
                if (!pgd)
                        return -ENOMEM;
+
                pud = vmemmap_pud_populate(pgd, addr, node);
                if (!pud)
                        return -ENOMEM;
@@ -759,19 +805,22 @@ int __meminit vmemmap_populate(struct page *start_page,
                pmd = pmd_offset(pud, addr);
                if (pmd_none(*pmd)) {
                        pte_t entry;
-                       void *p = vmemmap_alloc_block(PMD_SIZE, node);
+                       void *p;
+
+                       p = vmemmap_alloc_block(PMD_SIZE, node);
                        if (!p)
                                return -ENOMEM;
 
-                       entry = pfn_pte(__pa(p) >> PAGE_SHIFT, 
PAGE_KERNEL_LARGE);
+                       entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
+                                                       PAGE_KERNEL_LARGE);
                        set_pmd(pmd, __pmd(pte_val(entry)));
 
                        printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n",
                                addr, addr + PMD_SIZE - 1, p, node);
-               } else
+               } else {
                        vmemmap_verify((pte_t *)pmd, node, addr, next);
+               }
        }
-
        return 0;
 }
 #endif
-
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