netdev - Re: [PATCH V2 12/15] ARM: vexpress: cleanup cppcheck shifting error

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Date:   Mon, 24 Jun 2019 14:57:29 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Phong Tran <tranmanphong@...il.com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
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Subject: Re: [PATCH V2 12/15] ARM: vexpress: cleanup cppcheck shifting error

On Mon, Jun 24, 2019 at 08:51:02PM +0700, Phong Tran wrote:
> [arch/arm/mach-vexpress/spc.c:366]: (error) Shifting signed 32-bit value
> by 31 bits is undefined behaviour
> 
> Signed-off-by: Phong Tran <tranmanphong@...il.com>
> ---
>  arch/arm/mach-vexpress/spc.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/mach-vexpress/spc.c b/arch/arm/mach-vexpress/spc.c
> index 0f5381d13494..425ce633667a 100644
> --- a/arch/arm/mach-vexpress/spc.c
> +++ b/arch/arm/mach-vexpress/spc.c
> @@ -57,8 +57,8 @@
>  
>  /* SPC CPU/cluster reset statue */
>  #define STANDBYWFI_STAT		0x3c
> -#define STANDBYWFI_STAT_A15_CPU_MASK(cpu)	(1 << (cpu))
> -#define STANDBYWFI_STAT_A7_CPU_MASK(cpu)	(1 << (3 + (cpu)))
> +#define STANDBYWFI_STAT_A15_CPU_MASK(cpu)	BIT((cpu))
> +#define STANDBYWFI_STAT_A7_CPU_MASK(cpu)	BIT((3 + (cpu)))

I guess you did this using a script, however, in the above two cases,
you don't need the extra parens - it was necessary in the original
though.

>  
>  /* SPC system config interface registers */
>  #define SYSCFG_WDATA		0x70
> @@ -69,7 +69,7 @@
>  #define A7_PERFVAL_BASE		0xC30
>  
>  /* Config interface control bits */
> -#define SYSCFG_START		(1 << 31)
> +#define SYSCFG_START		BIT(31)
>  #define SYSCFG_SCC		(6 << 20)
>  #define SYSCFG_STAT		(14 << 20)
>  
> @@ -90,8 +90,8 @@
>  #define CA15_DVFS	0
>  #define CA7_DVFS	1
>  #define SPC_SYS_CFG	2
> -#define STAT_COMPLETE(type)	((1 << 0) << (type << 2))
> -#define STAT_ERR(type)		((1 << 1) << (type << 2))
> +#define STAT_COMPLETE(type)	(BIT(0) << (type << 2))
> +#define STAT_ERR(type)		(BIT(1) << (type << 2))
>  #define RESPONSE_MASK(type)	(STAT_COMPLETE(type) | STAT_ERR(type))
>  
>  struct ve_spc_opp {
> @@ -162,7 +162,7 @@ void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set)
>  	if (cluster >= MAX_CLUSTERS)
>  		return;
>  
> -	mask = 1 << cpu;
> +	mask = BIT(cpu);
>  
>  	if (!cluster_is_a15(cluster))
>  		mask <<= 4;
> -- 
> 2.11.0
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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