From 1aa8aea535977f0e0b398f39d052e7befff81da6 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Thu, 19 May 2016 17:12:00 -0700 Subject: mm: uninline page_mapped() It's huge. Uninlining it saves 206 bytes per callsite. Shaves 4924 bytes from the x86_64 allmodconfig vmlinux. [akpm@linux-foundation.org: coding-style fixes] Cc: Steve Capper Cc: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/util.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'mm/util.c') diff --git a/mm/util.c b/mm/util.c index 6cc81e7b8705..8a1b3a1fb595 100644 --- a/mm/util.c +++ b/mm/util.c @@ -346,6 +346,29 @@ void *page_rmapping(struct page *page) return __page_rmapping(page); } +/* + * Return true if this page is mapped into pagetables. + * For compound page it returns true if any subpage of compound page is mapped. + */ +bool page_mapped(struct page *page) +{ + int i; + + if (likely(!PageCompound(page))) + return atomic_read(&page->_mapcount) >= 0; + page = compound_head(page); + if (atomic_read(compound_mapcount_ptr(page)) >= 0) + return true; + if (PageHuge(page)) + return false; + for (i = 0; i < hpage_nr_pages(page); i++) { + if (atomic_read(&page[i]._mapcount) >= 0) + return true; + } + return false; +} +EXPORT_SYMBOL(page_mapped); + struct anon_vma *page_anon_vma(struct page *page) { unsigned long mapping; -- cgit v1.2.3-59-g8ed1b