Re: [PATCH V4 4/6] PCI: rcar: Replace (8 * n) with (BITS_PER_BYTE * n)

[Simon Horman <horms@verge.net.au>]

On Mon, Mar 25, 2019 at 12:40:59PM +0100, marek.vasut@gmail.com wrote:
> From: Marek Vasut <marek.vasut+renesas@gmail.com>
> 
> Replace (8 * n) with (BITS_PER_BYTE * n) to make bit shift operations
> consistent. No functional change.
> 
> Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
> Cc: Geert Uytterhoeven <geert+renesas@glider.be>
> Cc: Phil Edworthy <phil.edworthy@renesas.com>
> Cc: Simon Horman <horms+renesas@verge.net.au>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: linux-renesas-soc@vger.kernel.org
> To: linux-pci@vger.kernel.org
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

> ---
> V2: Bundle this patch with other cleanups before resending
> V3: Add Wolfram's R-B
> V4: Change the patch from n << 3 to BITS_PER_BYTE * n
> ---
>  drivers/pci/controller/pcie-rcar.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
> index 6699211fdc9a..96210768e774 100644
> --- a/drivers/pci/controller/pcie-rcar.c
> +++ b/drivers/pci/controller/pcie-rcar.c
> @@ -170,7 +170,7 @@ enum {
>  
>  static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
>  {
> -	unsigned int shift = 8 * (where & 3);
> +	unsigned int shift = BITS_PER_BYTE * (where & 3);
>  	u32 val = rcar_pci_read_reg(pcie, where & ~3);
>  
>  	val &= ~(mask << shift);
> @@ -180,7 +180,7 @@ static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
>  
>  static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
>  {
> -	unsigned int shift = 8 * (where & 3);
> +	unsigned int shift = BITS_PER_BYTE * (where & 3);
>  	u32 val = rcar_pci_read_reg(pcie, where & ~3);
>  
>  	return val >> shift;
> @@ -280,9 +280,9 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
>  	}
>  
>  	if (size == 1)
> -		*val = (*val >> (8 * (where & 3))) & 0xff;
> +		*val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
>  	else if (size == 2)
> -		*val = (*val >> (8 * (where & 2))) & 0xffff;
> +		*val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
>  
>  	dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
>  		bus->number, devfn, where, size, (unsigned long)*val);
> @@ -308,11 +308,11 @@ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
>  		bus->number, devfn, where, size, (unsigned long)val);
>  
>  	if (size == 1) {
> -		shift = 8 * (where & 3);
> +		shift = BITS_PER_BYTE * (where & 3);
>  		data &= ~(0xff << shift);
>  		data |= ((val & 0xff) << shift);
>  	} else if (size == 2) {
> -		shift = 8 * (where & 2);
> +		shift = BITS_PER_BYTE * (where & 2);
>  		data &= ~(0xffff << shift);
>  		data |= ((val & 0xffff) << shift);
>  	} else
> -- 
> 2.20.1
>