linux-kernel - Re: [PATCH][next] PCI: imx6: Use fallthrough pseudo-keyword

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200716220629.GA663054@bjorn-Precision-5520>
Date:   Thu, 16 Jul 2020 17:06:29 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] PCI: imx6: Use fallthrough pseudo-keyword

On Thu, Jul 16, 2020 at 04:10:52PM -0500, Gustavo A. R. Silva wrote:
> Replace the existing /* fall through */ comments and its variants with
> the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
> fall-through markings when it is the case.
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Hi Gustavo,

I'm certainly fine with these patches, and thanks for doing them!

And thanks for providing a link to the rationale.  But the URL
contains "latest", so I think it may break if deprecated.rst or the
section is ever renamed.

I think I would prefer if we could reference the current text, e.g.,
via

  https://www.kernel.org/doc/html/v5.7-rc7/process/deprecated.html#implicit-switch-case-fall-through

(The v5.7 doc would be better but doesn't seem to be generated yet; I
pinged the helpdesk about that.)

Or we could refer to b9918bdcac1f ("Documentation/process: Add
fallthrough pseudo-keyword"), although it's not nearly as pretty as
the HTML.

> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 4e5c379ae418..1119ded593d0 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -439,7 +439,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
>  		break;
> -	case IMX6QP:		/* FALLTHROUGH */
> +	case IMX6QP:
>  	case IMX6Q:
>  		/* power up core phy and enable ref clock */
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> @@ -642,7 +642,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
>  				   IMX6SX_GPR12_PCIE_RX_EQ_2);
> -		/* FALLTHROUGH */
> +		fallthrough;
>  	default:
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  				   IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> @@ -1107,7 +1107,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>  			dev_err(dev, "pcie_aux clock source missing or invalid\n");
>  			return PTR_ERR(imx6_pcie->pcie_aux);
>  		}
> -		/* fall through */
> +		fallthrough;
>  	case IMX7D:
>  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
>  			imx6_pcie->controller_id = 1;
> -- 
> 2.27.0
>