linux-kernel - Re: [PATCH v1] : Switch to use new generic UUID API

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Message-ID: <CAHp75Vf4ndBaS6BjAM==7csYB9EYDvjV9jT9C6kioDryzb_HnQ@mail.gmail.com>
Date:   Thu, 24 Jan 2019 15:36:38 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Javier González <javier@...igon.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christoph Hellwig <hch@....de>,
        Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] : Switch to use new generic UUID API

On Thu, Jan 24, 2019 at 3:19 PM Javier González <javier@...igon.com> wrote:
> > On 24 Jan 2019, at 13.16, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> > On Mon, Jan 21, 2019 at 09:47:32AM +0100, Christoph Hellwig wrote:
> >> On Thu, Jan 10, 2019 at 04:30:51PM +0200, Andy Shevchenko wrote:
> >>> There are new types and helpers that are supposed to be used in new code.
> >>>
> >>> As a preparation to get rid of legacy types and API functions do
> >>> the conversion here.
> >>
> >> This seems to miss a "lightnvm" in the subject line.
> >>
> >>> static inline void pblk_setup_uuid(struct pblk *pblk)
> >>> {
> >>> +   guid_gen((guid_t *)&pblk->instance_uuid);
> >>> }
> >>
> >> I think we can just kill this wrapper.
> >>
> >> But more importantly the instance_uuid fied, and the header.uuid one
> >> it is copied from should be turned into an actual guid_t, the memcpys
> >> and memcmps should also be replaced with the proper UUID API.
> >
> > header.uuid is defined using __u8 type, I'm not sure we can use guid_t there.
> >
>
> We can turn it into a guid_t and bump the minor version.

It's not so easy. __uXX types are dedicated for external APIs. guid_t
is kernel internal type disregard of (still) presence some uapi bits.
So, the question is those __uXX types in the driver definition is a
simple mistake, (weird) style decision, or what?

-- 
With Best Regards,
Andy Shevchenko