[PATCH 1/4] mm: pass set_count and set_reserved to __init_single_page

Yajun Deng
2023-09-22T07:10:10Z

When we init a single page, we need to mark this page reserved if it
does. And somes page may not need to set page count, such as compound
pages.

Pass set_count and set_reserved to __init_single_page, let the caller
decide if it needs to set page count or mark page reserved.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
---
mm/hugetlb.c | 2 +-
mm/internal.h | 3 ++-
mm/mm_init.c | 30 ++++++++++++++++--------------
3 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e2123d1bb4a2..4f91e47430ce 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3196,7 +3196,7 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
struct page *page = pfn_to_page(pfn);

- __init_single_page(page, pfn, zone, nid);
+ __init_single_page(page, pfn, zone, nid, true, false);
prep_compound_tail((struct page *)folio, pfn - head_pfn);
ret = page_ref_freeze(page, 1);
VM_BUG_ON(!ret);
diff --git a/mm/internal.h b/mm/internal.h
index 7a961d12b088..8bded7f98493 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1210,7 +1210,8 @@ struct vma_prepare {
};

void __meminit __init_single_page(struct page *page, unsigned long pfn,
- unsigned long zone, int nid);
+ unsigned long zone, int nid, bool set_count,
+ bool set_reserved);

/* shrinker related functions */
unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 06a72c223bce..c40042098a82 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -557,11 +557,13 @@ static void __init find_zone_movable_pfns_for_nodes(void)
}

void __meminit __init_single_page(struct page *page, unsigned long pfn,
- unsigned long zone, int nid)
+ unsigned long zone, int nid, bool set_count,
+ bool set_reserved)
{
mm_zero_struct_page(page);
set_page_links(page, zone, nid, pfn);
- init_page_count(page);
+ if (set_count)
+ init_page_count(page);
page_mapcount_reset(page);
page_cpupid_reset_last(page);
page_kasan_tag_reset(page);
@@ -572,6 +574,8 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn,
if (!is_highmem_idx(zone))
set_page_address(page, __va(pfn << PAGE_SHIFT));
#endif
+ if (set_reserved)
+ __SetPageReserved(page);
}

#ifdef CONFIG_NUMA
@@ -714,7 +718,7 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid)
if (zone_spans_pfn(zone, pfn))
break;
}
- __init_single_page(pfn_to_page(pfn), pfn, zid, nid);
+ __init_single_page(pfn_to_page(pfn), pfn, zid, nid, true, false);
}
#else
static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {}
@@ -821,8 +825,8 @@ static void __init init_unavailable_range(unsigned long spfn,
pfn = pageblock_end_pfn(pfn) - 1;
continue;
}
- __init_single_page(pfn_to_page(pfn), pfn, zone, node);
- __SetPageReserved(pfn_to_page(pfn));
+ __init_single_page(pfn_to_page(pfn), pfn, zone, node,
+ true, true);
pgcnt++;
}

@@ -884,7 +888,7 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone
}

page = pfn_to_page(pfn);
- __init_single_page(page, pfn, zone, nid);
+ __init_single_page(page, pfn, zone, nid, true, false);
if (context == MEMINIT_HOTPLUG)
__SetPageReserved(page);

@@ -965,11 +969,9 @@ static void __init memmap_init(void)
#ifdef CONFIG_ZONE_DEVICE
static void __ref __init_zone_device_page(struct page *page, unsigned long pfn,
unsigned long zone_idx, int nid,
- struct dev_pagemap *pgmap)
+ struct dev_pagemap *pgmap,
+ bool set_count)
{
-
- __init_single_page(page, pfn, zone_idx, nid);
-
/*
* Mark page reserved as it will need to wait for onlining
* phase for it to be fully associated with a zone.
@@ -977,7 +979,7 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn,
* We can use the non-atomic __set_bit operation for setting
* the flag as we are still initializing the pages.
*/
- __SetPageReserved(page);
+ __init_single_page(page, pfn, zone_idx, nid, set_count, true);

/*
* ZONE_DEVICE pages union ->lru with a ->pgmap back pointer
@@ -1041,7 +1043,7 @@ static void __ref memmap_init_compound(struct page *head,
for (pfn = head_pfn + 1; pfn < end_pfn; pfn++) {
struct page *page = pfn_to_page(pfn);

- __init_zone_device_page(page, pfn, zone_idx, nid, pgmap);
+ __init_zone_device_page(page, pfn, zone_idx, nid, pgmap, false);
prep_compound_tail(head, pfn - head_pfn);
set_page_count(page, 0);

@@ -1084,7 +1086,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
for (pfn = start_pfn; pfn < end_pfn; pfn += pfns_per_compound) {
struct page *page = pfn_to_page(pfn);

- __init_zone_device_page(page, pfn, zone_idx, nid, pgmap);
+ __init_zone_device_page(page, pfn, zone_idx, nid, pgmap, true);

if (pfns_per_compound == 1)
continue;
@@ -2058,7 +2060,7 @@ static unsigned long __init deferred_init_pages(struct zone *zone,
} else {
page++;
}
- __init_single_page(page, pfn, zid, nid);
+ __init_single_page(page, pfn, zid, nid, true, false);
nr_pages++;
}
return (nr_pages);
--
2.25.1