linux-kernel - Re: [Outreachy kernel] [PATCH v2] staging: rts5208: Replace a bit shift by a use of BIT.

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Date:   Wed, 22 Mar 2017 14:24:07 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v2] staging: rts5208: Replace a bit
 shift by a use of BIT.



On Wed, 22 Mar 2017, Arushi Singhal wrote:

> This patch replaces bit shifting on 1 with the BIT(x) macro.
> This was done with coccinelle:
> @@
> constant c;
> @@
>
> -1 << c
> +BIT(c)
>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>

Acked-by: Julia Lawall <julia.lawall@...6.fr>

> ---
> changes in v2
>  - remove the unnecessary parenthesis.
>
>  drivers/staging/rts5208/rtsx_chip.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rts5208/rtsx_chip.c b/drivers/staging/rts5208/rtsx_chip.c
> index 3511157a2c78..7f4107bffe31 100644
> --- a/drivers/staging/rts5208/rtsx_chip.c
> +++ b/drivers/staging/rts5208/rtsx_chip.c
> @@ -1490,7 +1490,7 @@ int rtsx_write_register(struct rtsx_chip *chip, u16 addr, u8 mask, u8 data)
>
>  	for (i = 0; i < MAX_RW_REG_CNT; i++) {
>  		val = rtsx_readl(chip, RTSX_HAIMR);
> -		if ((val & (1 << 31)) == 0) {
> +		if ((val & BIT(31)) == 0) {
>  			if (data != (u8)val) {
>  				rtsx_trace(chip);
>  				return STATUS_FAIL;
> @@ -1518,7 +1518,7 @@ int rtsx_read_register(struct rtsx_chip *chip, u16 addr, u8 *data)
>
>  	for (i = 0; i < MAX_RW_REG_CNT; i++) {
>  		val = rtsx_readl(chip, RTSX_HAIMR);
> -		if ((val & (1 << 31)) == 0)
> +		if ((val & BIT(31)) == 0)
>  			break;
>  	}
>
> --
> 2.11.0
>
> --
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