linux-kernel - Re: [PATCH v2 2/5] i2c: designware: Optimize flag reading in i2c_dw

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Message-ID: <aQTMUrMbfgs59oBQ@smile.fi.intel.com>
Date: Fri, 31 Oct 2025 16:48:50 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Benoît Monin <benoit.monin@...tlin.com>
Cc: Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jan Dabros <jsd@...ihalf.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Théo Lebrun <theo.lebrun@...tlin.com>,
	Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
	Dmitry Guzman <dmitry.guzman@...ileye.com>,
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH v2 2/5] i2c: designware: Optimize flag reading in
 i2c_dw_read()

On Fri, Oct 31, 2025 at 03:35:40PM +0100, Benoît Monin wrote:
> Optimize the i2c_dw_read() function by reading the message flags only
> once per message, rather than for every byte.
> 
> The message index is only modified by the outer loop, so reading the
> flags in the inner loop was always getting the same value.

Does it affect the binary (compiled) file?

-- 
With Best Regards,
Andy Shevchenko