From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71])
	by kanga.kvack.org (Postfix) with ESMTP id C0CB56B55F0
	for <linux-mm@kvack.org>; Fri, 31 Aug 2018 04:11:28 -0400 (EDT)
Received: by mail-wr1-f71.google.com with SMTP id w6-v6so7781015wrc.22
        for <linux-mm@kvack.org>; Fri, 31 Aug 2018 01:11:28 -0700 (PDT)
Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65])
        by mx.google.com with SMTPS id x185-v6sor1893186wme.27.2018.08.31.01.11.27
        for <linux-mm@kvack.org>
        (Google Transport Security);
        Fri, 31 Aug 2018 01:11:27 -0700 (PDT)
Date: Fri, 31 Aug 2018 10:11:24 +0200
From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: Re: [PATCH v6 11/11] arm64: annotate user pointers casts detected by
 sparse
Message-ID: <20180831081123.6mo62xnk54pvlxmc@ltop.local>
References: <cover.1535629099.git.andreyknvl@google.com>
 <5d54526e5ff2e5ad63d0dfdd9ab17cf359afa4f2.1535629099.git.andreyknvl@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <5d54526e5ff2e5ad63d0dfdd9ab17cf359afa4f2.1535629099.git.andreyknvl@google.com>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, Robin Murphy <robin.murphy@arm.com>, Al Viro <viro@zeniv.linux.org.uk>, Kees Cook <keescook@chromium.org>, Kate Stewart <kstewart@linuxfoundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Shuah Khan <shuah@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>, Kostya Serebryany <kcc@google.com>, Evgeniy Stepanov <eugenis@google.com>, Lee Smith <Lee.Smith@arm.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Chintan Pandya <cpandya@codeaurora.org>

On Thu, Aug 30, 2018 at 01:41:16PM +0200, Andrey Konovalov wrote:
> This patch adds __force annotations for __user pointers casts detected by
> sparse with the -Wcast-from-as flag enabled (added in [1]).
> 
> [1] https://github.com/lucvoo/sparse-dev/commit/5f960cb10f56ec2017c128ef9d16060e0145f292

Hi,

It would be nice to have some explanation for why these added __force
are useful.

-- Luc Van Oostenryck