Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
 format=flowed
Content-Transfer-Encoding: 7bit
Date:   Thu, 20 Aug 2020 11:49:09 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To:     Maulik Shah <mkshah@codeaurora.org>
Cc:     bjorn.andersson@linaro.org, agross@kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        ulf.hansson@linaro.org, swboyd@chromium.org, dianders@chromium.org,
        rnayak@codeaurora.org, ilina@codeaurora.org, lsrao@codeaurora.org,
        John Stultz <john.stultz@linaro.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH 1/2] Revert "drivers: qcom: rpmh-rsc: Use rcuidle
 tracepoints for rpmh"
In-Reply-To: <1597831670-17401-2-git-send-email-mkshah@codeaurora.org>
References: <1597831670-17401-1-git-send-email-mkshah@codeaurora.org>
 <1597831670-17401-2-git-send-email-mkshah@codeaurora.org>
Message-ID: <8456a8006c0c165bb33dc34219eb7e5e@codeaurora.org>
User-Agent: Roundcube Webmail/1.3.9
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 2020-08-19 15:37, Maulik Shah wrote:
> This change was done based on an test results of unmerged series of
> adding RSC power domain and using .power_off callback of genpd to
> invoke rpmh_flush().
> 
>      Call trace:
>       dump_backtrace+0x0/0x174
>       show_stack+0x20/0x2c
>       dump_stack+0xc8/0x124
>       lockdep_rcu_suspicious+0xe4/0x104
>       __tcs_buffer_write+0x230/0x2d0
>       rpmh_rsc_write_ctrl_data+0x210/0x270
>       rpmh_flush+0x84/0x24c
>       rpmh_domain_power_off+0x78/0x98
>       _genpd_power_off+0x40/0xc0
>       genpd_power_off+0x168/0x208
> 
> Later the final merged solution is to use CPU PM notification to invoke
> rpmh_flush() and .power_off callback of genpd is not implemented in the
> driver.
> 
> Remove this change since RCU will not be idle during CPU PM 
> notifications
> hence not required to use _rcuidle tracepoint. Using _rcuidle 
> tracepoint
> prevented rpmh driver to be loadable module as these are not exported
> symbols.
> 
> This reverts commit efde2659b0fe835732047357b2902cca14f054d9.
> 
> Cc: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
> Cc: John Stultz <john.stultz@linaro.org>
> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> ---

Reviewed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>

Thanks,
Sai

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a 
member
of Code Aurora Forum, hosted by The Linux Foundation