From: Jonathan Cameron <jic23@kernel.org>
To: Andy Shevchenko <andy@kernel.org>
Cc: "Ceclan Dumitru" <mitrutzceclan@gmail.com>,
linus.walleij@linaro.org, brgl@bgdev.pl,
linux-gpio@vger.kernel.org,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Michael Walle" <michael@walle.cc>,
"Arnd Bergmann" <arnd@arndb.de>,
"ChiaEn Wu" <chiaen_wu@richtek.com>,
"Niklas Schnelle" <schnelle@linux.ibm.com>,
"Leonard Göhrs" <l.goehrs@pengutronix.de>,
"Mike Looijmans" <mike.looijmans@topic.nl>,
"Haibo Chen" <haibo.chen@nxp.com>,
"Hugo Villeneuve" <hvilleneuve@dimonoff.com>,
"David Lechner" <dlechner@baylibre.com>,
"Ceclan Dumitru" <dumitru.ceclan@analog.com>,
linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v13 2/3] iio: adc: ad_sigma_delta: Add optional irq selection
Date: Sat, 24 Feb 2024 17:02:25 +0000 [thread overview]
Message-ID: <20240224170225.4720f9a2@jic23-huawei> (raw)
In-Reply-To: <ZdS0kOKTWHlisuyn@smile.fi.intel.com>
On Tue, 20 Feb 2024 16:17:52 +0200
Andy Shevchenko <andy@kernel.org> wrote:
> On Tue, Feb 20, 2024 at 04:13:12PM +0200, Ceclan Dumitru wrote:
> > On 2/20/24 16:11, Andy Shevchenko wrote:
> > > On Tue, Feb 20, 2024 at 11:43:39AM +0200, Dumitru Ceclan wrote:
>
> ...
>
> > >> + if (!info->irq_num)
> > >> + sigma_delta->irq_num = spi->irq;
> > >> + else
> > >> + sigma_delta->irq_num = info->irq_num;
> > >
> > > Why not positive check?
> > >
> > Considered that selecting spi->irq is usually the default case, so it should
> > be the first branch
>
> Let compiler do its job, the negative conditions are harder to read/parse by
> human beings.
>
FWIW compiler almost certainly won't figure this out as it has nothing to go on
- history based branch prediction in processors will though! We don't want to
be hinting direction to the compiler for a case like this as that will make
it very painful if we get it wrong. Anyhow Andy's comment is valid even if
I disagree with the reason.
Jonathan
next prev parent reply other threads:[~2024-02-24 17:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-20 9:43 [PATCH v13 1/3] dt-bindings: adc: add AD7173 Dumitru Ceclan
2024-02-20 9:43 ` [PATCH v13 2/3] iio: adc: ad_sigma_delta: Add optional irq selection Dumitru Ceclan
2024-02-20 14:11 ` Andy Shevchenko
2024-02-20 14:13 ` Ceclan Dumitru
2024-02-20 14:17 ` Andy Shevchenko
2024-02-24 17:02 ` Jonathan Cameron [this message]
2024-02-20 9:43 ` [PATCH v13 3/3] iio: adc: ad7173: add AD7173 driver Dumitru Ceclan
2024-02-20 10:38 ` Nuno Sá
2024-02-20 11:25 ` Ceclan Dumitru
2024-02-20 12:15 ` Nuno Sá
2024-02-20 12:20 ` Nuno Sá
2024-02-20 14:19 ` Andy Shevchenko
2024-02-20 18:52 ` [PATCH v13 1/3] dt-bindings: adc: add AD7173 Conor Dooley
2024-02-24 18:29 ` Jonathan Cameron
2024-02-20 20:54 ` David Lechner
2024-02-21 8:29 ` Ceclan Dumitru
2024-02-21 20:00 ` Conor Dooley
2024-02-24 17:07 ` Jonathan Cameron
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