Re: bcache not working on 4.16.x

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Hi Coly!

Before I reboot with the patch applied, it emits a compiler warning you may
want to fix:

drivers/md/bcache/debug.c:20:23: Warnung: »debug« defined but not used
[-Wunused-variable]
static struct dentry *debug;
                      ^~~~~

See you after reboot. :-)

Regards,
Kai


2018-05-16 15:02 GMT+02:00 Coly Li <colyli@xxxxxxx>:
> On 2018/5/16 6:46 PM, Kai Krakow wrote:
>> Hello Kent!
>>
>> 2018-05-16 9:58 GMT+02:00 Kent Overstreet <kent.overstreet@xxxxxxxxx>:
>>> On Wed, May 02, 2018 at 12:53:17PM +0200, Massimo B. wrote:
>>>> Hello,
>>>>
>>>> have you been able to modprobe bcache on 4.16.x?
>>>> I have asked on IRC and it seemed nobody tried before, just me.
>>>> So nobody was able to confirm or confirm against...
>>>>
>>>> https://github.com/dracutdevs/dracut/issues/393
>>>> At least here I'm not able to modprobe the bcache module from an initramfs.
>>>> So I can't boot with that 4.16.x kernel as my root fs is on bcache.
>>>
>>> It was busted by 539d39eb27083405b82b9e604e88af01a9a46c63 (bcache: fix wrong
>>> return value in bch_debug_init()) - only breaks when CONFIG_DEBUG_FS=n
>>>
>>> also, that commit has a bunch of other unrelated changes in it...
>>
>> Thanks for the pointer, this sounds promising. Do you suggest to remove
>> the unrelated changes, or do you suggest to revert the change in
>> bch_debug_init()?
>>
>> I'll try to fiddle around with this commit this evening.
>
> Hi Massimo, Kai,
>
> Could you please to have a try with the attached patch ? This is a
> rebased version for 4.16.9, I verified it with a kernel has no debugfs
> enabled. Hope it works on your kernels.
>
> If the patches works for you all, I will post patches to 4.17 and
> 4.16-stable both.
>
> Thanks.
>
> Coly Li
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