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Sun, 20 Oct 2019 08:25:17 -0700 (PDT) Date: Sun, 20 Oct 2019 20:55:10 +0530 From: Manivannan Sadhasivam To: Stephen Boyd Subject: Re: [PATCH v5 2/8] clk: Warn if clk_init_data is not zero initialized Message-ID: <20191020152510.GA12864@Mani-XPS-13-9360> References: <20190916161447.32715-1-manivannan.sadhasivam@linaro.org> <20190916161447.32715-3-manivannan.sadhasivam@linaro.org> <20190917203854.8CF702054F@mail.kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190917203854.8CF702054F@mail.kernel.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191020_082520_363980_1C45EE23 X-CRM114-Status: GOOD ( 19.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mturquette@baylibre.com, linux-kernel@vger.kernel.org, darren.tsao@bitmain.com, robh+dt@kernel.org, haitao.suo@bitmain.com, fisher.cheng@bitmain.com, alec.lin@bitmain.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Stephen, On Tue, Sep 17, 2019 at 01:38:53PM -0700, Stephen Boyd wrote: > Quoting Manivannan Sadhasivam (2019-09-16 09:14:41) > > The new implementation for determining parent map uses multiple ways > > to pass parent info. The order in which it gets processed depends on > > the first available member. Hence, it is necessary to zero init the > > clk_init_data struct so that the expected member gets processed correctly. > > So, add a warning if multiple clk_init_data members are available during > > clk registration. > > > > Signed-off-by: Manivannan Sadhasivam > > --- > > drivers/clk/clk.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c > > index c0990703ce54..7d6d6984c979 100644 > > --- a/drivers/clk/clk.c > > +++ b/drivers/clk/clk.c > > @@ -3497,6 +3497,14 @@ static int clk_core_populate_parent_map(struct clk_core *core) > > if (!num_parents) > > return 0; > > > > + /* > > + * Check for non-zero initialized clk_init_data struct. This is > > + * required because, we only require one of the (parent_names/ > > + * parent_data/parent_hws) to be set at a time. Otherwise, the > > + * current code would use first available member. > > + */ > > + WARN_ON((parent_names && parent_data) || (parent_names && parent_hws)); > > + > > This will warn for many drivers because they set clk_init_data on the > stack and assign parent_names but let junk from the stack be assigned to > parent_data. Yes, I agree. > The code uses parent_names first and then looks for > parent_data or parent_hws because of this fact of life that we've never > required clk_init_data to be initialized to all zero. > Do you want me to just drop this patch or have any idea to make it better? Thanks, Mani > > /* > > * Avoid unnecessary string look-ups of clk_core's possible parents by > > * having a cache of names/clk_hw pointers to clk_core pointers. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel