linux-kernel - Re: [PATCH] cpufreq: s3c64xx: Remove pointless NULL check in s3c64xx_cpufreq_driver

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Date:   Wed, 23 Oct 2019 11:43:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] cpufreq: s3c64xx: Remove pointless NULL check in
 s3c64xx_cpufreq_driver_init

On Wed, Oct 23, 2019 at 08:53:02AM +0530, Viresh Kumar wrote:
> On 22-10-19, 17:09, Nathan Chancellor wrote:
> > When building with Clang + -Wtautological-pointer-compare:
> > 
> > drivers/cpufreq/s3c64xx-cpufreq.c:152:6: warning: comparison of array
> > 's3c64xx_freq_table' equal to a null pointer is always false
> > [-Wtautological-pointer-compare]
> >         if (s3c64xx_freq_table == NULL) {
> >             ^~~~~~~~~~~~~~~~~~    ~~~~
> > 1 warning generated.
> > 
> > The definition of s3c64xx_freq_table is surrounded by an ifdef
> > directive for CONFIG_CPU_S3C6410, which is always true for this driver
> > because it depends on it in drivers/cpufreq/Kconfig.arm (and if it
> > weren't, there would be a build error because s3c64xx_freq_table would
> > not be a defined symbol).

> +broonie, who wrote this patch to see his views on why he kept it like
> this.

The driver should also have supported s3c6400 as well.

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