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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: "Bjørn Mork" <bjorn@mork.no>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	platform-driver-x86@vger.kernel.org
Subject: Re: [PATCH v8 1/6] software node: rename is_array to is_inline
Date: Wed, 13 Nov 2019 00:08:13 -0800
Message-ID: <20191113080813.GO13374@dtor-ws> (raw)
In-Reply-To: <87woc4s1xg.fsf@miraculix.mork.no>

On Wed, Nov 13, 2019 at 07:52:43AM +0100, Bjørn Mork wrote:
> Dmitry Torokhov <dmitry.torokhov@gmail.com> writes:
> 
> > We do not need a special flag to know if we are dealing with an array,
> > as we can get that data from ratio between element length and the data
> > size, however we do need a flag to know whether the data is stored
> > directly inside property_entry or separately.
> 
> Doesn't a non-null prop->pointer tell you this?

No it does not because pointer is a part of a union.

> 
> And inverting the flag is unnecessarily risky IMHO. An all-zero prop
> might now result in dereferencing a NULL prop->pointer instead of using
> the empty prop->value.  Now I haven't looked at the code to see if this
> is a real problem.  But I believe it's better not having to do that
> anyway...

All-zero property is a terminator and thus we will not dereference
anything.

Thanks.

-- 
Dmitry

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08  4:22 [PATCH v8 0/6] software node: add support for reference properties Dmitry Torokhov
2019-11-08  4:22 ` [PATCH v8 1/6] software node: rename is_array to is_inline Dmitry Torokhov
2019-11-08  9:49   ` Rafael J. Wysocki
2019-11-13  6:52   ` Bjørn Mork
2019-11-13  8:08     ` Dmitry Torokhov [this message]
2019-11-08  4:22 ` [PATCH v8 2/6] software node: allow embedding of small arrays into property_entry Dmitry Torokhov
2019-11-08  4:22 ` [PATCH v8 3/6] software node: implement reference properties Dmitry Torokhov
2019-11-08  4:22 ` [PATCH v8 4/6] platform/x86: intel_cht_int33fe: use inline " Dmitry Torokhov
2019-11-08  4:22 ` [PATCH v8 5/6] software node: remove separate handling of references Dmitry Torokhov
2019-11-08  4:22 ` [PATCH v8 6/6] software node: add basic tests for property entries Dmitry Torokhov

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