From 1ff8038988adecfde71d82c0597727fc239d4e8c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 12 Dec 2005 16:24:33 -0800 Subject: [PATCH] get_user_pages: don't try to follow PFNMAP pages Nick Piggin points out that a few drivers play games with VM_IO (why? who knows..) and thus a pfn-remapped area may not have that bit set even if remap_pfn_range() set it originally. So make it explicit in get_user_pages() that we don't follow VM_PFNMAP pages, since pretty much by definition they do not have a "struct page" associated with them. 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 47c533eaa0..d22f78c8a3 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1009,7 +1009,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, continue; } - if (!vma || (vma->vm_flags & VM_IO) + if (!vma || (vma->vm_flags & (VM_IO | VM_PFNMAP)) || !(vm_flags & vma->vm_flags)) return i ? : -EFAULT; -- 2.39.5