From 0da7e01f5f37f441cccd7c8c0586e06db0981907 Mon Sep 17 00:00:00 2001 From: Dean Nelson Date: Tue, 16 Oct 2007 01:24:45 -0700 Subject: [PATCH] calculation of pgoff in do_linear_fault() uses mixed units The calculation of pgoff in do_linear_fault() should use PAGE_SHIFT and not PAGE_CACHE_SHIFT since vma->vm_pgoff is in units of PAGE_SIZE and not PAGE_CACHE_SIZE. At the moment linux/pagemap.h has PAGE_CACHE_SHIFT defined as PAGE_SHIFT, but should that ever change this calculation would break. Signed-off-by: Dean Nelson Acked-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index 2a8430844b6d..b3c42f0f65c2 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2361,7 +2361,7 @@ static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma, int write_access, pte_t orig_pte) { pgoff_t pgoff = (((address & PAGE_MASK) - - vma->vm_start) >> PAGE_CACHE_SHIFT) + vma->vm_pgoff; + - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; unsigned int flags = (write_access ? FAULT_FLAG_WRITE : 0); pte_unmap(page_table); -- GitLab