diff options
author | Andrew Morton <akpm@linux-foundation.org> | 2016-05-19 17:12:00 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-19 19:12:14 -0700 |
commit | 1aa8aea535977f0e0b398f39d052e7befff81da6 (patch) | |
tree | b62bccedaf7ff2763dfc3788557482d16eb1cb46 /mm | |
parent | 29f9cb53d25cd9916537b44b0af7f0b95a2e4438 (diff) | |
download | linux-1aa8aea535977f0e0b398f39d052e7befff81da6.tar.bz2 |
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 <steve.capper@arm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/util.c | 23 |
1 files changed, 23 insertions, 0 deletions
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; |