[PATCH] uclinux: add NULL check, 0 end valid check and some more exports to nommu.c

[pandora-kernel.git] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index fd4e8df..064d704 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -57,6 +57,11 @@ DECLARE_RWSEM(nommu_vma_sem);
 struct vm_operations_struct generic_file_vm_ops = {
 };
 
+EXPORT_SYMBOL(vmalloc);
+EXPORT_SYMBOL(vfree);
+EXPORT_SYMBOL(vmalloc_to_page);
+EXPORT_SYMBOL(vmalloc_32);
+
 /*
  * Handle all mappings that got truncated by a "truncate()"
  * system call.
@@ -142,6 +147,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
        return(i);
 }
 
+EXPORT_SYMBOL(get_user_pages);
+
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;
 
@@ -852,7 +859,7 @@ unsigned long do_mmap_pgoff(struct file *file,
  error_getting_vma:
        up_write(&nommu_vma_sem);
        kfree(vml);
-       printk("Allocation of vml for %lu byte allocation from process %d failed\n",
+       printk("Allocation of vma for %lu byte allocation from process %d failed\n",
               len, current->pid);
        show_free_areas();
        return -ENOMEM;
@@ -909,7 +916,7 @@ int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
 
        for (parent = &mm->context.vmlist; *parent; parent = &(*parent)->next)
                if ((*parent)->vma->vm_start == addr &&
-                   (*parent)->vma->vm_end == end)
+                   ((len == 0) || ((*parent)->vma->vm_end == end)))
                        goto found;
 
        printk("munmap of non-mmaped memory by process %d (%s): %p\n",
@@ -1054,7 +1061,8 @@ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr)
 int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
                unsigned long to, unsigned long size, pgprot_t prot)
 {
-       return -EPERM;
+       vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+       return 0;
 }
 
 void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
@@ -1073,9 +1081,10 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
 
 void update_mem_hiwater(struct task_struct *tsk)
 {
-       unsigned long rss = get_mm_counter(tsk->mm, rss);
+       unsigned long rss;
 
        if (likely(tsk->mm)) {
+               rss = get_mm_counter(tsk->mm, rss);
                if (tsk->mm->hiwater_rss < rss)
                        tsk->mm->hiwater_rss = rss;
                if (tsk->mm->hiwater_vm < tsk->mm->total_vm)