linux-2.6.33/__get_vm_area_node() 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/__get_vm_area_node() へ行く。
  • 1 (2010-12-02 (木) 16:11:57)

---

参照元†

• linux-2.6.33/get_vm_area()

説明†

• パス: [[linux-2.6.33/]]

• FIXME: これは何？
  • 説明

引数†

• unsigned long size
• unsigned long align
• unsigned long flags
• unsigned long start
• unsigned long end
• int node
• gfp_t gfp_mask
  • linux-2.6.33/gfp_t
• void *caller

返り値†

• struct vm_struct *

参考†

実装†

static struct vm_struct *__get_vm_area_node(unsigned long size,
		unsigned long align, unsigned long flags, unsigned long start,
		unsigned long end, int node, gfp_t gfp_mask, void *caller)
{
	static struct vmap_area *va;
	struct vm_struct *area;

• • linux-2.6.33/vmap_area

	BUG_ON(in_interrupt());

• • linux-2.6.33/BUG_ON()

• linux-2.6.33/in_interrupt()

	if (flags & VM_IOREMAP) {
		int bit = fls(size);

• • linux-2.6.33/VM_IOREMAP

• linux-2.6.33/fls()

		if (bit > IOREMAP_MAX_ORDER)
			bit = IOREMAP_MAX_ORDER;
		else if (bit < PAGE_SHIFT)
			bit = PAGE_SHIFT;

		align = 1ul << bit;

• • linux-2.6.33/IOREMAP_MAX_ORDER

• linux-2.6.33/PAGE_SHIFT

	}

	size = PAGE_ALIGN(size);
	if (unlikely(!size))
		return NULL;

• • linux-2.6.33/PAGE_ALIGN()

• linux-2.6.33/unlikely()

	area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
	if (unlikely(!area))
		return NULL;

• • linux-2.6.33/kzalloc_node()

• linux-2.6.33/GFP_RECLAIM_MASK

	/*
	 * We always allocate a guard page.
	 */
	size += PAGE_SIZE;

	va = alloc_vmap_area(size, align, start, end, node, gfp_mask);
	if (IS_ERR(va)) {
		kfree(area);
		return NULL;
	}

• • linux-2.6.33/alloc_vmap_area()

• linux-2.6.33/IS_ERR()

• • linux-2.6.33/kfree()

    	insert_vmalloc_vm(area, va, flags, caller);
    	return area;

• linux-2.6.33/insert_vmalloc_vm()

}

コメント†