linux-2.6.33/remove_vm_area() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/remove_vm_area() へ行く。
  • 1 (2010-12-02 (木) 15:07:50)

参照元†

• linux-2.6.33/__vunmap()

説明†

• パス: linux-2.6.33/mm/vmalloc.c

• FIXME: これは何？
  • 説明

引数†

• const void *addr

返り値†

• struct vm_struct *
  • linux-2.6.33/vm_struct

参考†

実装†

/**
 *	remove_vm_area  -  find and remove a continuous kernel virtual area
 *	@addr:		base address
 *
 *	Search for the kernel VM area starting at @addr, and remove it.
 *	This function returns the found VM area, but using it is NOT safe
 *	on SMP machines, except for its size or flags.
 */
struct vm_struct *remove_vm_area(const void *addr)
{
	struct vmap_area *va;

• • linux-2.6.33/vmap_area

	va = find_vmap_area((unsigned long)addr);

• • linux-2.6.33/find_vmap_area()

	if (va && va->flags & VM_VM_AREA) {
		struct vm_struct *vm = va->private;
		struct vm_struct *tmp, **p;

• • linux-2.6.33/VM_VM_AREA

		/*
		 * remove from list and disallow access to this vm_struct
		 * before unmap. (address range confliction is maintained by
		 * vmap.)
		 */
		write_lock(&vmlist_lock);
		for (p = &vmlist; (tmp = *p) != vm; p = &tmp->next)
			;

• • linux-2.6.33/write_lock()

		*p = tmp->next;
		write_unlock(&vmlist_lock);

• • linux-2.6.33/write_unlock()

		vmap_debug_free_range(va->va_start, va->va_end);

• • linux-2.6.33/vmap_debug_free_range()

		free_unmap_vmap_area(va);
		vm->size -= PAGE_SIZE;

• • linux-2.6.33/free_unmap_vmap_area()

• linux-2.6.33/PAGE_SIZE

		return vm;
	}
	return NULL;
}

コメント†