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mm: make is_free_buddy_page() take a const argument
This function does not modify its argument; let the callers know that so they can make better optimisation decisions. Link: https://lkml.kernel.org/r/20240326171045.410737-6-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1088,7 +1088,7 @@ static inline bool is_page_hwpoison(const struct page *page)
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return folio_test_hugetlb(folio) && PageHWPoison(&folio->page);
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return folio_test_hugetlb(folio) && PageHWPoison(&folio->page);
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}
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}
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extern bool is_free_buddy_page(struct page *page);
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bool is_free_buddy_page(const struct page *page);
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PAGEFLAG(Isolated, isolated, PF_ANY);
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PAGEFLAG(Isolated, isolated, PF_ANY);
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@ -6745,16 +6745,16 @@ void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
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/*
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/*
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* This function returns a stable result only if called under zone lock.
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* This function returns a stable result only if called under zone lock.
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*/
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*/
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bool is_free_buddy_page(struct page *page)
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bool is_free_buddy_page(const struct page *page)
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{
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{
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unsigned long pfn = page_to_pfn(page);
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unsigned long pfn = page_to_pfn(page);
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unsigned int order;
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unsigned int order;
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for (order = 0; order < NR_PAGE_ORDERS; order++) {
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for (order = 0; order < NR_PAGE_ORDERS; order++) {
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struct page *page_head = page - (pfn & ((1 << order) - 1));
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const struct page *head = page - (pfn & ((1 << order) - 1));
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if (PageBuddy(page_head) &&
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if (PageBuddy(head) &&
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buddy_order_unsafe(page_head) >= order)
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buddy_order_unsafe(head) >= order)
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break;
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break;
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}
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}
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