Re: [Wg-test-framework] linux 3.14.34 failure to detect disks on C600 storage controller

["Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>]

Well, I still don't see this as a driver bug.  Once you are building a kernel 
from source you are no longer a user, you're a developer.  A user should just 
use a distro and we've already established that Debian loads the correct 3.16 
driver and all its dependencies.

I'll ask around but I don't think I'll get much.  I still think the best idea 
is to build the 3.14 kernel starting from a 3.16 config, I'm guessing that will 
work and we can use that to find out what's wrong.

--
Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
Ph: 303/443-3786

-----Original Message-----
From: Ian Campbell [mailto:ian.campbell@xxxxxxxxxx] 
Sent: Monday, April 20, 2015 3:01 AM
To: Dugger, Donald D
Cc: Ian Jackson; wg-test-framework@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [Wg-test-framework] linux 3.14.34 failure to detect disks on C600 
storage controller

From a user perspective a bug in a driver's Kconfig which allows a non-working 
configuration to be generated is still a driver bug and should be fixed.

On Fri, 2015-04-17 at 17:04 +0000, Dugger, Donald D wrote:
> I'm not sure why you think there's a driver problem.  We've 
> demonstrated that the 3.16 kernel works properly so that indicates to 
> me that the code is correct.  It's possible that the 3.14 driver had a 
> bug that was fixed in 3.16 but even if that is the case then the 
> response from the driver people will be `it's fixed, use 3.16'.
> 
> I think there is value in trying my experiment of building a 3.14 
> kernel based upon a working 3.16 config file:
> 
>       1)  If the resulting 3.14 kernel works then it proves that we are not 
> fighting a driver bug (my suspicion)
>       2)  I think the two 3.14 config files will be close enough that we 
> can identify the necessary config options
> 
> --
> Don Dugger
> "Censeo Toto nos in Kansa esse decisse." - D. Gale
> Ph: 303/443-3786
> 
> -----Original Message-----
> From: Ian Jackson [mailto:Ian.Jackson@xxxxxxxxxxxxx]
> Sent: Friday, April 17, 2015 10:12 AM
> To: Dugger, Donald D
> Cc: Ian Campbell; wg-test-framework@xxxxxxxxxxxxxxxxxxxx
> Subject: RE: [Wg-test-framework] linux 3.14.34 failure to detect disks 
> on C600 storage controller
> 
> Dugger, Donald D writes ("RE: [Wg-test-framework] linux 3.14.34 failure to 
> detect disks on C600 storage controller"):
> > Well, another possibility is that the Debian 3.16 kernel has something 
> > builtin with `=y' that is needed, that wouldn't show up in the modules list.
> 
> That might be the case.
> 
> > Another thing you can try is to take the config file from the Debian 3.16 
> > kernel and use it as the base to make your 3.14 kernel.  Just copy that 
> > config file to `.config', do a `make oldconfig', answer any questions that 
> > come up, build and see if that kernel works.  3.16 isn't that far away from 
> > 3.14 so there hopefully aren't any major changes in the configs between the 
> > two.
> 
> I know how to build kernels, thank you.
> 
> I could try this, but even if it fingers the configuration it wouldn't tell 
> us which specific option works around what I think is probably driver bug.
> 
> I am already chasing down and trying to work around several other driver and 
> kernel bugs affecting various machines in the new test setup.  For example, 
> the swiotlb-related problem with Broadcom's tg3 driver.  Broadcom have been 
> providing engineering support for that.
> 
> Can you please get in touch with someone technical at Intel and have them 
> help investigate ?
> 
> Obviously it is in Intel's interests to get this problem fixed, not just in 
> general (since it's a driver for Intel hardware) but specifically in the 
> context of osstest and Xen: these machines are not going into the test pool 
> until we can get them to work, and as a result we are not testing Xen on them.
> 
> Thanks,
> Ian.
> 
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