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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>,
	Linux ACPI <linux-acpi@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>
Subject: Re: [PATCH v1 1/1] ACPI: NFIT: Import GUID before use
Date: Fri, 16 Apr 2021 20:33:55 +0300	[thread overview]
Message-ID: <YHnKg4MHkZ4QIBHR@smile.fi.intel.com> (raw)
In-Reply-To: <CAPcyv4jzg23CoQeqAyAR=PUjB4HG-FSnD8G0J7S=p22ANmzDMQ@mail.gmail.com>

On Fri, Apr 16, 2021 at 09:15:34AM -0700, Dan Williams wrote:
> On Fri, Apr 16, 2021 at 1:58 AM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Fri, Apr 16, 2021 at 8:28 AM Dan Williams <dan.j.williams@intel.com> wrote:
> > > On Thu, Apr 15, 2021 at 6:59 AM Andy Shevchenko
> > > <andriy.shevchenko@linux.intel.com> wrote:
> > > >
> > > > Strictly speaking the comparison between guid_t and raw buffer
> > > > is not correct. Import GUID to variable of guid_t type and then
> > > > compare.
> > >
> > > Hmm, what about something like the following instead, because it adds
> > > safety. Any concerns about evaluating x twice in a macro should be
> > > alleviated by the fact that ARRAY_SIZE() will fail the build if (x) is
> > > not an array.
> >
> > ARRAY_SIZE doesn't check type.
> 
> See __must_be_array.
> 
> > I don't like hiding ugly casts like this.
> 
> See PTR_ERR, ERR_PTR, ERR_CAST.

It's special, i.e. error pointer case. We don't handle such here.

> There's nothing broken about the way the code currently stands, so I'd
> rather try to find something to move the implementation forward than
> sideways.

Submit a patch then. I rest my case b/c I consider that ugly castings worse
than additional API call, although it's not ideal.

-- 
With Best Regards,
Andy Shevchenko

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  reply	other threads:[~2021-04-16 17:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15 13:59 [PATCH v1 1/1] ACPI: NFIT: Import GUID before use Andy Shevchenko
2021-04-16  5:17 ` Dan Williams
     [not found]   ` <CAHp75VcpQREYFesS9q2TeqrR29hf0CvMESM42AVGAFzEYeRr_Q@mail.gmail.com>
2021-04-16 16:15     ` Dan Williams
2021-04-16 17:33       ` Andy Shevchenko [this message]
2021-04-16 18:04         ` Dan Williams

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