linux-kernel - Re: [PATCH 1/6] lightnvm: pblk: check for failed mempool alloc.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <086e6df7-65d8-57b7-6605-d585985a3ddf@kernel.dk>
Date:   Wed, 6 Sep 2017 09:13:46 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Javier González <jg@...htnvm.io>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matias Bjørling <matias@...xlabs.com>
Subject: Re: [PATCH 1/6] lightnvm: pblk: check for failed mempool alloc.

On 09/06/2017 09:12 AM, Javier González wrote:
>> On 6 Sep 2017, at 17.09, Jens Axboe <axboe@...nel.dk> wrote:
>>
>> On 09/06/2017 09:08 AM, Johannes Thumshirn wrote:
>>> On Wed, Sep 06, 2017 at 05:01:01PM +0200, Javier González wrote:
>>>> Check for failed mempool allocations and act accordingly.
>>>
>>> Are you sure it is needed? Quoting from mempool_alloc()s Documentation:
>>> "[...] Note that due to preallocation, this function *never* fails when called
>>> from process contexts. (it might fail if called from an IRQ context.) [...]"
>>
>> It's not needed, mempool() will never fail if __GFP_WAIT is set in the
>> mask. The use case here is GFP_KERNEL, which does include __GFP_WAIT.
> 
> Thanks for the clarification. Do you just drop the patch, or do you want
> me to re-send the series?

No need to resend. I'll pick up the others in a day or two, once people
have had some time to go over them.

-- 
Jens Axboe