From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752155AbdF1OB2 (ORCPT <rfc822;w@1wt.eu>);
        Wed, 28 Jun 2017 10:01:28 -0400
Received: from mail-pf0-f177.google.com ([209.85.192.177]:36189 "EHLO
        mail-pf0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751659AbdF1OBX (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 28 Jun 2017 10:01:23 -0400
Subject: Re: linux-next: build failure after merge of the block tree
From: Jens Axboe <axboe@kernel.dk>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        PowerPC <linuxppc-dev@lists.ozlabs.org>
References: <20170628180456.30cb9242@canb.auug.org.au>
 <664cc88d-18a5-18c4-5bce-4d4352d15f4f@kernel.dk>
Message-ID: <2bd17edb-4a5b-5bf8-7074-1156a5249325@kernel.dk>
Date: Wed, 28 Jun 2017 08:01:20 -0600
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.1.1
MIME-Version: 1.0
In-Reply-To: <664cc88d-18a5-18c4-5bce-4d4352d15f4f@kernel.dk>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 06/28/2017 06:43 AM, Jens Axboe wrote:
> On 06/28/2017 02:04 AM, Stephen Rothwell wrote:
>> Hi Jens,
>>
>> After merging the block tree, today's linux-next build (powerpc
>> allnoconfig) failed like this:
>>
>> fs/fcntl.o: In function `do_fcntl': 
>> fcntl.c:(.text+0x6d4): undefined reference to `__get_user_bad'
>> fcntl.c:(.text+0x730): undefined reference to `__get_user_bad'
>>
>> Probably caused by commit
>>
>>   c75b1d9421f8 ("fs: add fcntl() interface for setting/getting write life time hints")
>>
>> On powerpc (at least) you cannot use get_user() to fetch anything larger
>> than "unsigned long" i.e. 32 bits on 32 bit powerpc.
>>
>> This has been discussed before (and, I think, a fix attempted).
> 
> Gah, thanks for letting me know. I'll test your patch and queue it
> up to fix this issue.

But put_user() is fine? Just checking here, since the change adds
both a u64 put and get user.

-- 
Jens Axboe