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Merge 5b24eeef06 ("mm/page_alloc: split prep_compound_page into head and tail subparts") into android-mainline

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Steps on the way to 5.17-rc1

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ib542956cd675d577b7e7fdf1df45cdea2052bacf
This commit is contained in:
Greg Kroah-Hartman
2022-02-09 14:44:49 +01:00
parent 9d42df3abe 5b24eeef06
commit cdf35470bb
1 changed files with 20 additions and 10 deletions
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30
mm/page_alloc.c
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@@ -726,23 +726,33 @@ void free_compound_page(struct page *page)
free_the_page(page, compound_order(page));
}
static void prep_compound_head(struct page *page, unsigned int order)
{
set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
set_compound_order(page, order);
atomic_set(compound_mapcount_ptr(page), -1);
if (hpage_pincount_available(page))
atomic_set(compound_pincount_ptr(page), 0);
}
static void prep_compound_tail(struct page *head, int tail_idx)
{
struct page *p = head + tail_idx;
p->mapping = TAIL_MAPPING;
set_compound_head(p, head);
}
void prep_compound_page(struct page *page, unsigned int order)
{
int i;
int nr_pages = 1 << order;
__SetPageHead(page);
for (i = 1; i < nr_pages; i++) {
struct page *p = page + i;
p->mapping = TAIL_MAPPING;
set_compound_head(p, page);
}
for (i = 1; i < nr_pages; i++)
prep_compound_tail(page, i);
set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
set_compound_order(page, order);
atomic_set(compound_mapcount_ptr(page), -1);
if (hpage_pincount_available(page))
atomic_set(compound_pincount_ptr(page), 0);
prep_compound_head(page, order);
}
#ifdef CONFIG_DEBUG_PAGEALLOC