ACPI: ibm-acpi: break fan_read into separate functions

[powerpc.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index c7ed061..497e502 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -30,6 +30,10 @@
 #include <asm/cacheflush.h>
 #include <asm/tlb.h>
 
+#ifndef arch_mmap_check
+#define arch_mmap_check(addr, len, flags)      (0)
+#endif
+
 static void unmap_region(struct mm_struct *mm,
                struct vm_area_struct *vma, struct vm_area_struct *prev,
                unsigned long start, unsigned long end);
@@ -112,7 +116,7 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
                 * which are reclaimable, under pressure.  The dentry
                 * cache and most inode caches should fall into this
                 */
-               free += atomic_read(&slab_reclaim_pages);
+               free += global_page_state(NR_SLAB_RECLAIMABLE);
 
                /*
                 * Leave the last 3% for root
@@ -896,17 +900,6 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
        int accountable = 1;
        unsigned long charged = 0, reqprot = prot;
 
-       if (file) {
-               if (is_file_hugepages(file))
-                       accountable = 0;
-
-               if (!file->f_op || !file->f_op->mmap)
-                       return -ENODEV;
-
-               if ((prot & PROT_EXEC) &&
-                   (file->f_vfsmnt->mnt_flags & MNT_NOEXEC))
-                       return -EPERM;
-       }
        /*
         * Does the application expect PROT_READ to imply PROT_EXEC?
         *
@@ -920,6 +913,10 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
        if (!len)
                return -EINVAL;
 
+       error = arch_mmap_check(addr, len, flags);
+       if (error)
+               return error;
+
        /* Careful about overflows.. */
        len = PAGE_ALIGN(len);
        if (!len || len > TASK_SIZE)
@@ -992,6 +989,16 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
                case MAP_PRIVATE:
                        if (!(file->f_mode & FMODE_READ))
                                return -EACCES;
+                       if (file->f_vfsmnt->mnt_flags & MNT_NOEXEC) {
+                               if (vm_flags & VM_EXEC)
+                                       return -EPERM;
+                               vm_flags &= ~VM_MAYEXEC;
+                       }
+                       if (is_file_hugepages(file))
+                               accountable = 0;
+
+                       if (!file->f_op || !file->f_op->mmap)
+                               return -ENODEV;
                        break;
 
                default:
@@ -1097,12 +1104,6 @@ munmap_back:
                        goto free_vma;
        }
 
-       /* Don't make the VMA automatically writable if it's shared, but the
-        * backer wishes to know when pages are first written to */
-       if (vma->vm_ops && vma->vm_ops->page_mkwrite)
-               vma->vm_page_prot =
-                       protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC)];
-
        /* We set VM_ACCOUNT in a shared mapping's vm_flags, to inform
         * shmem_zero_setup (perhaps called through /dev/zero's ->mmap)
         * that memory reservation must be checked; but that reservation
@@ -1120,6 +1121,10 @@ munmap_back:
        pgoff = vma->vm_pgoff;
        vm_flags = vma->vm_flags;
 
+       if (vma_wants_writenotify(vma))
+               vma->vm_page_prot =
+                       protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC)];
+
        if (!file || !vma_merge(mm, prev, addr, vma->vm_end,
                        vma->vm_flags, NULL, file, pgoff, vma_policy(vma))) {
                file = vma->vm_file;
@@ -1866,6 +1871,7 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
        unsigned long flags;
        struct rb_node ** rb_link, * rb_parent;
        pgoff_t pgoff = addr >> PAGE_SHIFT;
+       int error;
 
        len = PAGE_ALIGN(len);
        if (!len)
@@ -1874,6 +1880,12 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
        if ((addr + len) > TASK_SIZE || (addr + len) < addr)
                return -EINVAL;
 
+       flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
+
+       error = arch_mmap_check(addr, len, flags);
+       if (error)
+               return error;
+
        /*
         * mlock MCL_FUTURE?
         */
@@ -1914,8 +1926,6 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
        if (security_vm_enough_memory(len >> PAGE_SHIFT))
                return -ENOMEM;
 
-       flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
-
        /* Can we just expand an old private anonymous mapping? */
        if (vma_merge(mm, prev, addr, addr + len, flags,
                                        NULL, NULL, pgoff, NULL))