linux-kernel - RE: linux-next: Tree for Sep 19

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Message-ID: <525DB349B3FB5444AE057A887CB2A8D88EF892@nice.asicdesigners.com>
Date:	Sat, 20 Sep 2014 01:43:05 +0000
From:	Anish Bhatt <anish@...lsio.com>
To:	Randy Dunlap <rdunlap@...radead.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"mchan@...adcom.com" <mchan@...adcom.com>
Subject: RE: linux-next: Tree for Sep 19

Original config causing issues can be seen here :
https://lkml.org/lkml/2014/9/9/500

As CNIC depends on IPV6, CNIC can be only compiled as a module when IPV6 is 
compiled as a module. This was the patch I originally commited. Previous 
behaviour was to disable all ipv6 code in such a case. However, having bnx2fc/i 
 as built-in overrides CNIC's tristate from m to built-in (as they select CNIC), 
 causing build issues. As far as I know, there is no way to control the state 
that select sets.
 -Anish
________________________________________
From: Randy Dunlap [rdunlap@...radead.org]
Sent: Friday, September 19, 2014 6:09 PM
To: Guenter Roeck; Stephen Rothwell
Cc: linux-next@...r.kernel.org; linux-kernel@...r.kernel.org; Anish Bhatt; David S. Miller; James E.J. Bottomley
Subject: Re: linux-next: Tree for Sep 19

On 09/19/14 17:15, Guenter Roeck wrote:
> On 09/19/2014 03:21 PM, Randy Dunlap wrote:
>> On 09/19/14 14:14, Guenter Roeck wrote:
>>> On Fri, Sep 19, 2014 at 04:58:17PM +1000, Stephen Rothwell wrote:
>>>> Hi all,
>>>>
>>>> Changes since 20140917:
>>>>
>>>> The fsl tree still had its build failure so I used the version from
>>>> next-20140917.
>>>>
>>>> The v4l-dvb tree lost its build failure.
>>>>
>>>> The security tree gained a conflict against the file-locks tree.
>>>>
>>>> Non-merge commits (relative to Linus' tree): 6014
>>>>   5488 files changed, 217522 insertions(+), 129375 deletions(-)
>>>>
>>>> ----------------------------------------------------------------------------
>>>>
>>> Guess this is most difficult one.
>>>
>>> mips:nlm_xlp_defconfig:
>>>
>>> warning: (SCSI_BNX2X_FCOE && LIBFCOE && TCM_QLA2XXX) selects LIBFC which has
>>> unmet direct dependencies (SCSI_LOWLEVEL && SCSI && SCSI_FC_ATTRS)
>>> warning: (SCSI_BNX2X_FCOE && LIBFCOE && TCM_QLA2XXX) selects LIBFC which has
>>> unmet direct dependencies (SCSI_LOWLEVEL && SCSI && SCSI_FC_ATTRS)
>>
>> Yes, I have a patch sitting on my hard drive that makes LIBFCOE and TCM_QLA2XXX
>> and SCSI_BNX2X_FCOE depend on SCSI_FC_ATTRS, but I'm not entirely happy about
>> having to hunt these down (even with the help of kconfig warnings).
>>
>
> One key problem is that nlm_xlp_defconfig does not configure NET anymore.
> this is after 'scsi_netlink : Make SCSI_NETLINK dependent on NET instead
> of selecting NET' was applied.
>
> In fact, there are many more affected configurations; the change from
> "select XXX" to "depends XXX" has far reaching consequences, as many
> configurations are no longer valid. For mips alone I find that this commit
> changes the following configurations.
>
> e55_defconfig
> gpr_defconfig
> ip27_defconfig
> jazz_defconfig
> loongson3_defconfig
> malta_defconfig
> malta_kvm_defconfig
> malta_kvm_guest_defconfig
> mtx1_defconfig
> nlm_xlp_defconfig
> nlm_xlr_defconfig
> rm200_defconfig
>
> e55_defconfig is almost the same as before, but only because CONFIG_NET
> was not configured for it to start with. For all others, CONFIG_NET is
> no longer set. This effectively means that out of 55 mips configurations,
> 11 or 20% are now bad. This is 3.17-rc5. vs. next-20140919.
>
> Frankly, I don't think this change was really helpful. On the contrary,
> we will be in a lot of trouble when this change makes it upstream.
> It might be be a good idea to be much more careful when making such
> changes. Cleaning up configuration dependencies is a laudable goal,
> but when it breaks configurations all over the place it does more damage
> than it is worth.

Yes, I suspect that we should just drop this effort and redo the original
problem's "fix".

Dave?

Anish, if you can remind me of the original problem and hopefully a kernel
.config file for it, I'll try to help with it.

--
~Randy
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