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Subject: Re: [PATCH 07/21] PCI: designware: Make use of IS_ALIGNED()
To:     Andrey Smirnov <andrew.smirnov@gmail.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Fabio Estevam <fabio.estevam@nxp.com>,
        Chris Healy <cphealy@gmail.com>,
        Lucas Stach <l.stach@pengutronix.de>,
        Leonard Crestez <leonard.crestez@nxp.com>,
        "A.s. Dong" <aisheng.dong@nxp.com>,
        Richard Zhu <hongxing.zhu@nxp.com>,
        "linux-imx@nxp.com" <linux-imx@nxp.com>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20181221072716.29017-1-andrew.smirnov@gmail.com>
 <20181221072716.29017-8-andrew.smirnov@gmail.com>
From:   Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Message-ID: <9b275993-c511-50d3-e18e-b421010c1bba@synopsys.com>
Date:   Wed, 2 Jan 2019 09:33:01 +0000
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Hi,

On 21/12/2018 07:27, Andrey Smirnov wrote:
> Make the intent a bit more clear as well as get rid of explicit
> arithmetic by using IS_ALIGNED() to determine if "addr" is aligned to
> "size". No functional change intended.
> 
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Fabio Estevam <fabio.estevam@nxp.com>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Cc: Leonard Crestez <leonard.crestez@nxp.com>
> Cc: "A.s. Dong" <aisheng.dong@nxp.com>
> Cc: Richard Zhu <hongxing.zhu@nxp.com>
> Cc: linux-imx@nxp.com
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-pci@vger.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 93ef8c31fb39..67236379c61a 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -22,7 +22,7 @@
>  
>  int dw_pcie_read(void __iomem *addr, int size, u32 *val)
>  {
> -	if ((uintptr_t)addr & (size - 1)) {
> +	if (!IS_ALIGNED((uintptr_t)addr, size)) {
>  		*val = 0;
>  		return PCIBIOS_BAD_REGISTER_NUMBER;
>  	}
> @@ -43,7 +43,7 @@ int dw_pcie_read(void __iomem *addr, int size, u32 *val)
>  
>  int dw_pcie_write(void __iomem *addr, int size, u32 val)
>  {
> -	if ((uintptr_t)addr & (size - 1))
> +	if (!IS_ALIGNED((uintptr_t)addr, size))
>  		return PCIBIOS_BAD_REGISTER_NUMBER;
>  
>  	if (size == 4)
> 

Sounds good.

Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>