linux-kernel - Re: lightnvm: pblk: avoid ref warning on cache creation

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Date:   Fri, 23 Nov 2018 08:31:05 +0000
From:   Javier Gonzalez <javier@...xlabs.com>
To:     Matias Bjørling <mb@...htnvm.io>
CC:     "javier@...igon.com" <javier@...igon.com>,
        Hans Holmberg <hans.holmberg@...xlabs.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: lightnvm: pblk: avoid ref warning on cache creation



> On 23 Nov 2018, at 09.24, Matias Bjørling <mb@...htnvm.io> wrote:
> 
> On 11/23/2018 09:16 AM, Javier Gonzalez wrote:
>>> On 23 Nov 2018, at 09.14, Matias Bjørling <mb@...htnvm.io> wrote:
>>> 
>>>> On 11/22/2018 02:46 PM, Javier González wrote:
>>>> Matias,
>>>> Can you pick this up for 4.20? Even though it is not an error per se, it
>>>> does trigger an ugly false positive warning when CONFIG_REFCOUNT_FULL is
>>>> set.
>>>> Thanks,
>>>> Javier
>>>> Javier González (1):
>>>>   lightnvm: pblk: avoid ref warning on cache creation
>>>>  drivers/lightnvm/pblk-init.c | 14 +++++---------
>>>>  1 file changed, 5 insertions(+), 9 deletions(-)
>>> 
>>> It is too late to get it for 4.20. I'll pull it in for 4.21.
>> Well, if it is a fix it’s not too late AFAIK. It also applies to a patch picked up in this series. We should have catches this before.
>> But I guess it’s your call.
> 
> There is a likelihood that Linus would catch it, with the result of fire & fury. I don't feel like using one of my cat life's for this one.

I don’t get how a fix in rc3 will result in Jens or Linus complaining. But Ok, let’s release 4.20 with a false positive warning for use-after-free on pblk creation. 


>>> We can put on a Fixes: 1864de94ec9d6 "lightnvm: pblk: stop recreating global caches" if you want Greg and friends to pick picked it up for stable kernels?
>> I didn’t add it as it is not a bug in itself. But it is good to add it. Can you do it.
> 
> I'll do it.

Thanks. 

Javier.