From a50b854e073cd3335bbbada8dcff83a857297dd7 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Mon, 23 Sep 2019 15:34:25 -0700 Subject: mm: introduce page_size() Patch series "Make working with compound pages easier", v2. These three patches add three helpers and convert the appropriate places to use them. This patch (of 3): It's unnecessarily hard to find out the size of a potentially huge page. Replace 'PAGE_SIZE << compound_order(page)' with page_size(page). Link: http://lkml.kernel.org/r/20190721104612.19120-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Michal Hocko Reviewed-by: Andrew Morton Reviewed-by: Ira Weiny Acked-by: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/iov_iter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/iov_iter.c') diff --git a/lib/iov_iter.c b/lib/iov_iter.c index f1e0569b4539..639d5e7014c1 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -878,7 +878,7 @@ static inline bool page_copy_sane(struct page *page, size_t offset, size_t n) head = compound_head(page); v += (page - head) << PAGE_SHIFT; - if (likely(n <= v && v <= (PAGE_SIZE << compound_order(head)))) + if (likely(n <= v && v <= (page_size(head)))) return true; WARN_ON(1); return false; -- cgit v1.2.3