void __init page_ext_init(void)
{
unsigned long pfn;
int nid;
if (!invoke_need_callbacks())
return;
for_each_node_state(nid, N_MEMORY) {
unsigned long start_pfn, end_pfn;
start_pfn = node_start_pfn(nid);
end_pfn = node_end_pfn(nid);
/*
* start_pfn and end_pfn may not be aligned to SECTION and the
* page->flags of out of node pages are not initialized. So we
* scan [start_pfn, the biggest section's pfn < end_pfn) here.
*/
for (pfn = start_pfn; pfn < end_pfn;
pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
if (!pfn_valid(pfn))
continue;
/*
* Nodes's pfns can be overlapping.
* We know some arch can have a nodes layout such as
* -------------pfn-------------->
* N0 | N1 | N2 | N0 | N1 | N2|....
*/
if (pfn_to_nid(pfn) != nid)
continue;
if (init_section_page_ext(pfn, nid))
goto oom;
}
}
/* IAMROOT-12AB:
* -------------
* FLATMEM을 사용하는 32bit ARM에서 사용
*/
void __init page_ext_init_flatmem(void)
{
int nid, fail;
/* IAMROOT-12AB:
* -------------
* 디버깅을 위해 page_ext 구조체 할당이 필요한지 여부를 체크한다.
*
* page_ext_ops[]->need에 등록된 함수들에서 하나도 true 발생하지 않으면 return
*/
if (!invoke_need_callbacks())
return;
/* IAMROOT-12AB:
* -------------
* 노드가 사용하는 페이지 만큼 page_ext[]를 각 노드에 할당한다.
* 각 노드의 node_page_ext는 할당된 메모리를 가리킨다.
*/
for_each_online_node(nid) {
fail = alloc_node_page_ext(nid);
if (fail)
goto fail;
}
pr_info("allocated %ld bytes of page_ext\n", total_usage);
invoke_init_callbacks();
return;
fail:
pr_crit("allocation of page_ext failed.\n");
panic("Out of memory");
}
void __init page_ext_init_flatmem(void)
{
int nid, fail;
if (!invoke_need_callbacks())
return;
for_each_online_node(nid) {
fail = alloc_node_page_ext(nid);
if (fail)
goto fail;
}
pr_info("allocated %ld bytes of page_ext\n", total_usage);
invoke_init_callbacks();
return;
fail:
pr_crit("allocation of page_ext failed.\n");
panic("Out of memory");
}
