From: Dmitry Osipenko <digetx@gmail.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
Stephen Boyd <sboyd@kernel.org>,
linux-pm@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>,
Rafael Wysocki <rjw@rjwysocki.net>,
Sibi Sankar <sibis@codeaurora.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>
Subject: Re: [PATCH 07/13] opp: Allow _generic_set_opp_clk_only() to work for non-freq devices
Date: Tue, 26 Jan 2021 00:09:06 +0300 [thread overview]
Message-ID: <7d6573e3-7885-fb0b-2290-c181e2c557f9@gmail.com> (raw)
In-Reply-To: <20210122043506.lm6yiefzlyubq5my@vireshk-i7>
22.01.2021 07:35, Viresh Kumar пишет:
> On 21-01-21, 23:26, Dmitry Osipenko wrote:
>> 21.01.2021 14:17, Viresh Kumar пишет:
>>> In order to avoid conditional statements at the caller site, this patch
>>> updates _generic_set_opp_clk_only() to work for devices that don't
>>> change frequency (like power domains, etc.). Return 0 if the clk pointer
>>> passed to this routine is not valid.
>>>
>>> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
>>> ---
>> ...
>>
>> Hello Viresh,
>>
>> Thank you very much for yours effort! I gave a quick test to this series
>> and instantly found one small issue in this patch.
>>
>>> + /* We may reach here for devices which don't change frequency */
>>> + if (unlikely(!clk))
>>
>> I replaced dev_pm_opp_set_voltage() with dev_pm_opp_set_opp() in the
>> Tegra PD driver and got a crash, which happens because the above line
>> should be:
>>
>> if (IS_ERR(clk))
>
> Fixed, thanks.
>
Please remove unlikely() around IS_ERR(), it already has the unlikely().
https://elixir.bootlin.com/linux/v5.11-rc4/source/include/linux/err.h#L22
I'd also recommend to remove all the unlikely() from OPP code since it
doesn't bring any value if not used in a very performance-critical code
path. OPP core doesn't have such code paths. The [un]likely() only make
code less readable and may result in a worse assembly.
next prev parent reply other threads:[~2021-01-25 21:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 11:17 [PATCH 00/13] opp: Implement dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17 ` [PATCH 01/13] opp: Rename _opp_set_rate_zero() Viresh Kumar
2021-01-21 11:17 ` [PATCH 02/13] opp: No need to check clk for errors Viresh Kumar
2021-01-21 11:17 ` [PATCH 03/13] opp: Keep track of currently programmed OPP Viresh Kumar
2021-01-21 21:41 ` Dmitry Osipenko
2021-01-22 4:45 ` Viresh Kumar
2021-01-22 14:31 ` Dmitry Osipenko
2021-01-25 3:12 ` Viresh Kumar
2021-01-27 16:31 ` Akhil P Oommen
2021-01-28 4:14 ` Viresh Kumar
2021-07-07 10:24 ` Ionela Voinescu
2021-07-08 7:53 ` Viresh Kumar
2021-07-09 8:57 ` Ionela Voinescu
2021-07-12 4:14 ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 04/13] opp: Split _set_opp() out of dev_pm_opp_set_rate() Viresh Kumar
2021-01-21 11:17 ` [PATCH 05/13] opp: Allow _set_opp() to work for non-freq devices Viresh Kumar
2021-01-21 11:17 ` [PATCH 06/13] opp: Allow _generic_set_opp_regulator() " Viresh Kumar
2021-01-21 11:17 ` [PATCH 07/13] opp: Allow _generic_set_opp_clk_only() " Viresh Kumar
2021-01-21 20:26 ` Dmitry Osipenko
2021-01-22 4:35 ` Viresh Kumar
2021-01-25 21:09 ` Dmitry Osipenko [this message]
2021-01-27 6:58 ` Viresh Kumar
2021-01-21 11:17 ` [PATCH 08/13] opp: Update parameters of _set_opp_custom() Viresh Kumar
2021-01-21 11:17 ` [PATCH 09/13] opp: Implement dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17 ` [PATCH 10/13] cpufreq: qcom: Migrate to dev_pm_opp_set_opp() Viresh Kumar
2021-01-21 11:17 ` [PATCH 11/13] devfreq: tegra30: " Viresh Kumar
2021-01-21 21:36 ` Dmitry Osipenko
2021-01-22 6:26 ` Viresh Kumar
2021-01-22 15:28 ` Dmitry Osipenko
2021-01-25 3:14 ` Viresh Kumar
2021-01-25 16:00 ` Dmitry Osipenko
2021-01-27 9:10 ` [PATCH V2 " Viresh Kumar
2021-01-27 10:02 ` Viresh Kumar
2021-01-27 15:58 ` Dmitry Osipenko
2021-01-28 7:01 ` Viresh Kumar
2021-02-01 0:21 ` Chanwoo Choi
2021-02-01 19:57 ` Dmitry Osipenko
2021-01-21 11:17 ` [PATCH 12/13] drm: msm: " Viresh Kumar
2021-01-21 11:17 ` [PATCH 13/13] opp: Remove dev_pm_opp_set_bw() Viresh Kumar
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