Re: [PATCH] drivers: staging: vme: Changed (1 << n) to BIT(n)

From: Andy Shevchenko
Date: Sun Nov 08 2015 - 16:43:33 EST

On Sun, Nov 8, 2015 at 10:39 PM, Egor Uleyskiy <egor.ulieiskii@xxxxxxxxx> wrote:
> From: Egor Uleyskiy <egor.ulieiskii@xxxxxxxxx>
>
> Signed-off-by: Egor Uleyskiy <egor.ulieiskii@xxxxxxxxx>
> ---
> drivers/staging/vme/devices/vme_pio2.h | 93 ++++++++++++++++------------------
> 1 file changed, 45 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/staging/vme/devices/vme_pio2.h b/drivers/staging/vme/devices/vme_pio2.h
> index d5d94c4..29d7a58 100644
> --- a/drivers/staging/vme/devices/vme_pio2.h
> +++ b/drivers/staging/vme/devices/vme_pio2.h
> @@ -1,6 +1,8 @@
> #ifndef _VME_PIO2_H_
> #define _VME_PIO2_H_
>
> +#include <linux/bitops.h>
> +
> #define PIO2_CARDS_MAX 32
>
> #define PIO2_VARIANT_LENGTH 5
> @@ -48,8 +50,6 @@ static const int PIO2_REGS_INT_MASK[8] = { PIO2_REGS_INT_MASK0,
> PIO2_REGS_INT_MASK6,
> PIO2_REGS_INT_MASK7 };
>
> -
> -
> #define PIO2_REGS_CTRL 0x18
> #define PIO2_REGS_VME_VECTOR 0x19
> #define PIO2_REGS_CNTR0 0x20
> @@ -63,7 +63,6 @@ static const int PIO2_REGS_INT_MASK[8] = { PIO2_REGS_INT_MASK0,
>
> #define PIO2_REGS_ID 0x30
>
> -
> /* PIO2_REGS_DATAx (0x0 - 0x3) */
>
> static const int PIO2_CHANNEL_BANK[32] = { 0, 0, 0, 0, 0, 0, 0, 0,
> @@ -71,38 +70,38 @@ static const int PIO2_CHANNEL_BANK[32] = { 0, 0, 0, 0, 0, 0, 0, 0,
> 2, 2, 2, 2, 2, 2, 2, 2,
> 3, 3, 3, 3, 3, 3, 3, 3 };
>
> -#define PIO2_CHANNEL0_BIT (1 << 0)
> -#define PIO2_CHANNEL1_BIT (1 << 1)
> -#define PIO2_CHANNEL2_BIT (1 << 2)
> -#define PIO2_CHANNEL3_BIT (1 << 3)
> -#define PIO2_CHANNEL4_BIT (1 << 4)
> -#define PIO2_CHANNEL5_BIT (1 << 5)
> -#define PIO2_CHANNEL6_BIT (1 << 6)
> -#define PIO2_CHANNEL7_BIT (1 << 7)
> -#define PIO2_CHANNEL8_BIT (1 << 0)
> -#define PIO2_CHANNEL9_BIT (1 << 1)
> -#define PIO2_CHANNEL10_BIT (1 << 2)
> -#define PIO2_CHANNEL11_BIT (1 << 3)
> -#define PIO2_CHANNEL12_BIT (1 << 4)
> -#define PIO2_CHANNEL13_BIT (1 << 5)
> -#define PIO2_CHANNEL14_BIT (1 << 6)
> -#define PIO2_CHANNEL15_BIT (1 << 7)
> -#define PIO2_CHANNEL16_BIT (1 << 0)
> -#define PIO2_CHANNEL17_BIT (1 << 1)
> -#define PIO2_CHANNEL18_BIT (1 << 2)
> -#define PIO2_CHANNEL19_BIT (1 << 3)
> -#define PIO2_CHANNEL20_BIT (1 << 4)
> -#define PIO2_CHANNEL21_BIT (1 << 5)
> -#define PIO2_CHANNEL22_BIT (1 << 6)
> -#define PIO2_CHANNEL23_BIT (1 << 7)
> -#define PIO2_CHANNEL24_BIT (1 << 0)
> -#define PIO2_CHANNEL25_BIT (1 << 1)
> -#define PIO2_CHANNEL26_BIT (1 << 2)
> -#define PIO2_CHANNEL27_BIT (1 << 3)
> -#define PIO2_CHANNEL28_BIT (1 << 4)
> -#define PIO2_CHANNEL29_BIT (1 << 5)
> -#define PIO2_CHANNEL30_BIT (1 << 6)
> -#define PIO2_CHANNEL31_BIT (1 << 7)
> +#define PIO2_CHANNEL0_BIT BIT(0)
> +#define PIO2_CHANNEL1_BIT BIT(1)
> +#define PIO2_CHANNEL2_BIT BIT(2)
> +#define PIO2_CHANNEL3_BIT BIT(3)
> +#define PIO2_CHANNEL4_BIT BIT(4)
> +#define PIO2_CHANNEL5_BIT BIT(5)
> +#define PIO2_CHANNEL6_BIT BIT(6)
> +#define PIO2_CHANNEL7_BIT BIT(7)
> +#define PIO2_CHANNEL8_BIT BIT(0)
> +#define PIO2_CHANNEL9_BIT BIT(1)
> +#define PIO2_CHANNEL10_BIT BIT(2)
> +#define PIO2_CHANNEL11_BIT BIT(3)
> +#define PIO2_CHANNEL12_BIT BIT(4)
> +#define PIO2_CHANNEL13_BIT BIT(5)
> +#define PIO2_CHANNEL14_BIT BIT(6)
> +#define PIO2_CHANNEL15_BIT BIT(7)
> +#define PIO2_CHANNEL16_BIT BIT(0)
> +#define PIO2_CHANNEL17_BIT BIT(1)
> +#define PIO2_CHANNEL18_BIT BIT(2)
> +#define PIO2_CHANNEL19_BIT BIT(3)
> +#define PIO2_CHANNEL20_BIT BIT(4)
> +#define PIO2_CHANNEL21_BIT BIT(5)
> +#define PIO2_CHANNEL22_BIT BIT(6)
> +#define PIO2_CHANNEL23_BIT BIT(7)
> +#define PIO2_CHANNEL24_BIT BIT(0)
> +#define PIO2_CHANNEL25_BIT BIT(1)
> +#define PIO2_CHANNEL26_BIT BIT(2)
> +#define PIO2_CHANNEL27_BIT BIT(3)
> +#define PIO2_CHANNEL28_BIT BIT(4)
> +#define PIO2_CHANNEL29_BIT BIT(5)
> +#define PIO2_CHANNEL30_BIT BIT(6)
> +#define PIO2_CHANNEL31_BIT BIT(7)
>
> static const int PIO2_CHANNEL_BIT[32] = { PIO2_CHANNEL0_BIT, PIO2_CHANNEL1_BIT,
> PIO2_CHANNEL2_BIT, PIO2_CHANNEL3_BIT,
> @@ -123,12 +122,12 @@ static const int PIO2_CHANNEL_BIT[32] = { PIO2_CHANNEL0_BIT, PIO2_CHANNEL1_BIT,
> };
>
> /* PIO2_REGS_INT_STAT_CNTR (0xc) */
> -#define PIO2_COUNTER0 (1 << 0)
> -#define PIO2_COUNTER1 (1 << 1)
> -#define PIO2_COUNTER2 (1 << 2)
> -#define PIO2_COUNTER3 (1 << 3)
> -#define PIO2_COUNTER4 (1 << 4)
> -#define PIO2_COUNTER5 (1 << 5)
> +#define PIO2_COUNTER0 BIT(0)
> +#define PIO2_COUNTER1 BIT(1)
> +#define PIO2_COUNTER2 BIT(2)
> +#define PIO2_COUNTER3 BIT(3)
> +#define PIO2_COUNTER4 BIT(4)
> +#define PIO2_COUNTER5 BIT(5)
>
> static const int PIO2_COUNTER[6] = { PIO2_COUNTER0, PIO2_COUNTER1,
> PIO2_COUNTER2, PIO2_COUNTER3,
> @@ -136,8 +135,8 @@ static const int PIO2_COUNTER[6] = { PIO2_COUNTER0, PIO2_COUNTER1,
>
> /* PIO2_REGS_CTRL (0x18) */
> #define PIO2_VME_INT_MASK 0x7
> -#define PIO2_LED (1 << 6)
> -#define PIO2_LOOP (1 << 7)
> +#define PIO2_LED BIT(6)
> +#define PIO2_LOOP BIT(7)
>
> /* PIO2_REGS_VME_VECTOR (0x19) */
> #define PIO2_VME_VECTOR_SPUR 0x0
> @@ -182,7 +181,7 @@ static const int PIO2_CNTR_CTRL[6] = { PIO2_REGS_CTRL_WRD0,
> PIO2_REGS_CTRL_WRD1 };
>
> #define PIO2_CNTR_SC_DEV0 0
> -#define PIO2_CNTR_SC_DEV1 (1 << 6)
> +#define PIO2_CNTR_SC_DEV1 BIT(6)
> #define PIO2_CNTR_SC_DEV2 (2 << 6)
> #define PIO2_CNTR_SC_RDBACK (3 << 6)

With the first parts which are an excellent clean up, this one makes
two styles out of one.
Greg, what would you suggest to do? For my opinion in such cases
direct values or previous syntax looks better.

>
> @@ -191,12 +190,12 @@ static const int PIO2_CNTR_SC_DEV[6] = { PIO2_CNTR_SC_DEV0, PIO2_CNTR_SC_DEV1,
> PIO2_CNTR_SC_DEV1, PIO2_CNTR_SC_DEV2 };
>
> #define PIO2_CNTR_RW_LATCH 0
> -#define PIO2_CNTR_RW_LSB (1 << 4)
> +#define PIO2_CNTR_RW_LSB BIT(4)
> #define PIO2_CNTR_RW_MSB (2 << 4)
> #define PIO2_CNTR_RW_BOTH (3 << 4)
>
> #define PIO2_CNTR_MODE0 0
> -#define PIO2_CNTR_MODE1 (1 << 1)
> +#define PIO2_CNTR_MODE1 BIT(1)
> #define PIO2_CNTR_MODE2 (2 << 1)
> #define PIO2_CNTR_MODE3 (3 << 1)
> #define PIO2_CNTR_MODE4 (4 << 1)
> @@ -204,8 +203,6 @@ static const int PIO2_CNTR_SC_DEV[6] = { PIO2_CNTR_SC_DEV0, PIO2_CNTR_SC_DEV1,
>
> #define PIO2_CNTR_BCD 1
>
> -
> -
> enum pio2_bank_config { NOFIT, INPUT, OUTPUT, BOTH };
> enum pio2_int_config { NONE = 0, LOW2HIGH = 1, HIGH2LOW = 2, EITHER = 4 };
>
> --
> 2.5.0
>
> --
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--
With Best Regards,
Andy Shevchenko
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