linux-kernel - Re: [PATCH] IB: Revert "remove redundant INFINIBAND kconfig dependencies"

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Date:   Mon, 28 May 2018 11:02:40 -0700
From:   Greg Thelen <gthelen@...gle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     arnd@...db.de, Doug Ledford <dledford@...hat.com>,
        Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, oleg.drokin@...el.com,
        andreas.dilger@...el.com, jsimmons@...radead.org,
        gregkh@...uxfoundation.org, Steve French <sfrench@...ba.org>,
        ericvh@...il.com, rminnich@...dia.gov, lucho@...kov.net,
        "David S. Miller" <davem@...emloft.net>,
        santosh.shilimkar@...cle.com, trond.myklebust@...merspace.com,
        anna.schumaker@...app.com, bfields@...ldses.org,
        jlayton@...nel.org, Bart Van Assche <bart.vanassche@....com>,
        linux-rdma@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org, lustre-devel@...ts.lustre.org,
        devel@...verdev.osuosl.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        rds-devel@....oracle.com, linux-nfs@...r.kernel.org
Subject: Re: [PATCH] IB: Revert "remove redundant INFINIBAND kconfig dependencies"

Jason Gunthorpe <jgg@...pe.ca> wrote:

> On Fri, May 25, 2018 at 05:32:52PM -0700, Greg Thelen wrote:
>> On Fri, May 25, 2018 at 2:32 PM Arnd Bergmann <arnd@...db.de> wrote:

>> > Several subsystems depend on INFINIBAND_ADDR_TRANS, which in turn  
>> depends
>> > on INFINIBAND. However, when with CONFIG_INIFIBAND=m, this leads to a
>> > link error when another driver using it is built-in. The
>> > INFINIBAND_ADDR_TRANS dependency is insufficient here as this is
>> > a 'bool' symbol that does not force anything to be a module in turn.

>> > fs/cifs/smbdirect.o: In function `smbd_disconnect_rdma_work':
>> > smbdirect.c:(.text+0x1e4): undefined reference to `rdma_disconnect'
>> > net/9p/trans_rdma.o: In function `rdma_request':
>> > trans_rdma.c:(.text+0x7bc): undefined reference to `rdma_disconnect'
>> > net/9p/trans_rdma.o: In function `rdma_destroy_trans':
>> > trans_rdma.c:(.text+0x830): undefined reference to `ib_destroy_qp'
>> > trans_rdma.c:(.text+0x858): undefined reference to `ib_dealloc_pd'

>> > Fixes: 9533b292a7ac ("IB: remove redundant INFINIBAND kconfig
>> dependencies")
>> > Signed-off-by: Arnd Bergmann <arnd@...db.de>

>> Acked-by: Greg Thelen <gthelen@...gle.com>

>> Sorry for the 9533b292a7ac problem.
>> At this point the in release cycle, I think Arnd's revert is best.

>> If there is interest, I've put a little thought into an alternative fix:
>> making INFINIBAND_ADDR_TRANS tristate.  But it's nontrivial.
>> So I prefer this simple revert for now.

> Is that a normal thing to do?

For me: no, it's not normal.  In my use case I merely want to disable
INFINIBAND_ADDR_TRANS while continuing to use INFINIBAND.  This is
supported with f7cb7b85be55 ("IB: make INFINIBAND_ADDR_TRANS
configurable").

During f7cb7b85be55 development https://lkml.org/lkml/2018/4/30/1073
suggested that we drop dependency on both INFINIBAND and
INFINIBAND_ADDR_TRANS.  Thus 9533b292a7ac ("IB: remove redundant
INFINIBAND kconfig dependencies").

But 9533b292a7ac led to the randconfig build errors reported and thus
("IB: Revert "remove redundant INFINIBAND kconfig dependencies"").

So I see no need to do anything more than apply ("IB: Revert "remove
redundant INFINIBAND kconfig dependencies"").

>> Doug: do you need anything from me on this?

> I can take the revert..

> Jason

Thanks.