参照元

説明

引数

返り値

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;
	va = find_vmap_area((unsigned long)addr);
	if (va && va->flags & VM_VM_AREA) {
		struct vm_struct *vm = va->private;
		struct vm_struct *tmp, **p;
		/*
		 * 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)
			;
		*p = tmp->next;
		write_unlock(&vmlist_lock);
		vmap_debug_free_range(va->va_start, va->va_end);
		free_unmap_vmap_area(va);
		vm->size -= PAGE_SIZE;
		return vm;
	}
	return NULL;
}

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