linux-kernel - Re: linux-next: build failure after merge of the rdma tree

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Date:   Wed, 28 Sep 2016 11:26:20 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Greg KH <greg@...ah.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>
Subject: Re: linux-next: build failure after merge of the rdma tree

On 9/28/16 11:23 AM, Greg KH wrote:
> On Wed, Sep 28, 2016 at 11:00:11AM -0400, Doug Ledford wrote:
>> On 9/27/16 9:43 PM, Stephen Rothwell wrote:
>>> Hi Stephen,
>>>
>>> On Tue, 27 Sep 2016 11:23:34 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>>>>
>>>> Hi Doug,
>>>>
>>>> After merging the rdma tree, today's linux-next build (x86_64
>>>> allmodconfig) failed like this:
>>>>
>>>> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c: In function 'kiblnd_hdev_setup_mrs':
>>>> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c:2317:7: error: implicit declaration of function 'ib_get_dma_mr' [-Werror=implicit-function-declaration]
>>>>   mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
>>>>        ^
>>>> drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c:2317:5: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
>>>>   mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
>>>>      ^
>>>>
>>>> Caused by commit
>>>>
>>>>   5ef990f06bd7 ("IB/core: remove ib_get_dma_mr")
>>>>
>>>> I have used the rdma tree from next-20160923 for today.
>>>
>>> As pointed out by Christoph, I should have just disabled the driver in
>>> staging, so today I just applied the patch below.  Doug, that should
>>> probably be applied to the rdma tree so that you don't break Linus'
>>> tree when it gets merged.
>>>
>>> From: Stephen Rothwell <sfr@...b.auug.org.au>
>>> Date: Wed, 28 Sep 2016 11:35:28 +1000
>>> Subject: [PATCH] starging/lustre: disable LNET infiniband support
>>>
>>> Commit 5ef990f06bd7 ("IB/core: remove ib_get_dma_mr") broke the
>>> lustre LNET infiniband support.  Since this is in drivers/staging,
>>> lets just disable it for now until ti can be fixed properly.
>>>
>>> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
>>> ---
>>>  drivers/staging/lustre/lnet/Kconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/staging/lustre/lnet/Kconfig b/drivers/staging/lustre/lnet/Kconfig
>>> index 2b5930150cda..13b43278a38d 100644
>>> --- a/drivers/staging/lustre/lnet/Kconfig
>>> +++ b/drivers/staging/lustre/lnet/Kconfig
>>> @@ -35,6 +35,7 @@ config LNET_SELFTEST
>>>  config LNET_XPRT_IB
>>>  	tristate "LNET infiniband support"
>>>  	depends on LNET && INFINIBAND && INFINIBAND_ADDR_TRANS
>>> +	depends on BROKEN
>>>  	default LNET && INFINIBAND
>>>  	help
>>>  	  This option allows the LNET users to use infiniband as an
>>>
>>
>> That doesn't seem like a particularly good thing to put in.  Wouldn't
>> you end up just reverting it later when they fix lustre?  And are you
>> going to revert the revert when it breaks again and revert the revert of
>> the revert when it's fixed again?
> 
> Yup :)
> 
> Well, in reality just keep adding and removing the line without dealing
> with reverts, much simpler...
> 
>> That just seems a lot of churn.  I
>> thought it was generally accepted that things in staging might or might
>> not work and if they don't, we don't care?  Am I wrong on that?
> 
> Nope, you are not wrong, but it is nice to not break some people's
> builds if it's possible.

Okie dokie, got it.


-- 
Doug Ledford <dledford@...hat.com>    GPG Key ID: 0E572FDD
  Red Hat, Inc.
  100 E. Davie St
  Raleigh, NC 27601 USA



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