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dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=RQ0ri5VC; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=lW32py9y; spf=none (imf24.hostedemail.com: domain of joao.m.martins@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=joao.m.martins@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Stat-Signature: yxn98r57f8gtwewcfy6k5d84uh8n8jsy X-Rspamd-Queue-Id: CC25AA00026F X-Rspamd-Server: rspam06 X-HE-Tag: 1623955560-392240 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Split the utility function prep_compound_page() into head and tail counterparts, and use them accordingly. This is in preparation for sharing the storage for / deduplicating compound page metadata. Signed-off-by: Joao Martins Acked-by: Mike Kravetz --- mm/page_alloc.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 8836e54721ae..95967ce55829 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -741,24 +741,34 @@ 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; + + set_page_count(p, 0); + 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; - set_page_count(p, 0); - 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