From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yw0-f199.google.com (mail-yw0-f199.google.com [209.85.161.199]) by kanga.kvack.org (Postfix) with ESMTP id 7D9A56B007E for ; Mon, 2 May 2016 11:17:35 -0400 (EDT) Received: by mail-yw0-f199.google.com with SMTP id x189so196035630ywe.2 for ; Mon, 02 May 2016 08:17:35 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id 134si14955898qkh.103.2016.05.02.08.17.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 02 May 2016 08:17:34 -0700 (PDT) Date: Mon, 2 May 2016 16:15:38 +0200 From: Oleg Nesterov Subject: Re: GUP guarantees wrt to userspace mappings redesign Message-ID: <20160502141538.GA5961@redhat.com> References: <20160428181726.GA2847@node.shutemov.name> <20160428125808.29ad59e5@t450s.home> <20160428232127.GL11700@redhat.com> <20160429005106.GB2847@node.shutemov.name> <20160428204542.5f2053f7@ul30vt.home> <20160429070611.GA4990@node.shutemov.name> <20160429163444.GM11700@redhat.com> <20160502104119.GA23305@node.shutemov.name> <20160502111513.GA4079@gmail.com> <20160502121402.GB23305@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160502121402.GB23305@node.shutemov.name> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Jerome Glisse , Hugh Dickins , Linus Torvalds , Andrew Morton , Andrea Arcangeli , Alex Williamson , kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, "linux-mm@kvack.org" I am sure I missed the problem, but... On 05/02, Kirill A. Shutemov wrote: > > Quick look around: > > - I don't see any check page_count() around __replace_page() in uprobes, > so it can easily replace pinned page. Why it should? even if it races with get_user_pages_fast()... this doesn't differ from the case when an application writes to MAP_PRIVATE non-anonymous region, no? Oleg. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org