From 99e3e53f4e0fd807607bf381e14f6de8feedd383 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Mon, 7 Apr 2014 15:37:21 -0700 Subject: [PATCH] mm: cleanup size checks in filemap_fault() and filemap_map_pages() Minor cleanups: - 'size' variable is now in bytes, not pages; - use round_up(): it should be easier to read. Signed-off-by: Kirill A. Shutemov Cc: Linus Torvalds Cc: Mel Gorman Cc: Rik van Riel Cc: Andi Kleen Cc: Matthew Wilcox Cc: Dave Hansen Cc: Alexander Viro Cc: Dave Chinner Cc: Ning Qu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/filemap.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 3f9b5fb..b952d99 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1953,11 +1953,11 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) struct inode *inode = mapping->host; pgoff_t offset = vmf->pgoff; struct page *page; - pgoff_t size; + loff_t size; int ret = 0; - size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (offset >= size) + size = round_up(i_size_read(inode), PAGE_CACHE_SIZE); + if (offset >= size >> PAGE_CACHE_SHIFT) return VM_FAULT_SIGBUS; /* @@ -2006,8 +2006,8 @@ retry_find: * Found the page and have a reference on it. * We must recheck i_size under page lock. */ - size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (unlikely(offset >= size)) { + size = round_up(i_size_read(inode), PAGE_CACHE_SIZE); + if (unlikely(offset >= size >> PAGE_CACHE_SHIFT)) { unlock_page(page); page_cache_release(page); return VM_FAULT_SIGBUS; @@ -2111,8 +2111,8 @@ repeat: if (page->mapping != mapping || !PageUptodate(page)) goto unlock; - size = i_size_read(mapping->host) + PAGE_CACHE_SIZE - 1; - if (page->index >= size >> PAGE_CACHE_SHIFT) + size = round_up(i_size_read(mapping->host), PAGE_CACHE_SIZE); + if (page->index >= size >> PAGE_CACHE_SHIFT) goto unlock; pte = vmf->pte + page->index - vmf->pgoff; -- 2.7.4