linux-kernel - Re: [PATCH] irqchip/gic-v3: mark expected switch fall-through

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Date:   Mon, 29 Jul 2019 10:53:28 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Matteo Croce <mcroce@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH] irqchip/gic-v3: mark expected switch fall-through

On 29/07/2019 01:11, Matteo Croce wrote:
> Mark switch cases where we are expecting to fall through,
> fixes the following warnings:
> 
> drivers/irqchip/irq-gic-v3.c: In function ‘gic_cpu_sys_reg_init’:
> ./arch/arm64/include/asm/sysreg.h:853:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   asm volatile(__msr_s(r, "%x0") : : "rZ" (__val));  \
>   ^~~
> ./arch/arm64/include/asm/arch_gicv3.h:20:29: note: in expansion of macro ‘write_sysreg_s’
>  #define write_gicreg(v, r)  write_sysreg_s(v, SYS_ ## r)
>                              ^~~~~~~~~~~~~~
> drivers/irqchip/irq-gic-v3.c:773:4: note: in expansion of macro ‘write_gicreg’
>     write_gicreg(0, ICC_AP0R2_EL1);
>     ^~~~~~~~~~~~
> drivers/irqchip/irq-gic-v3.c:774:3: note: here
>    case 6:
>    ^~~~
> 
> drivers/irqchip/irq-gic-v3.c:788:3: note: in expansion of macro ‘write_gicreg’
>    write_gicreg(0, ICC_AP1R2_EL1);
>    ^~~~~~~~~~~~
>   CC      net/ipv4/af_inet.o
> drivers/irqchip/irq-gic-v3.c:789:2: note: here
>   case 6:
>   ^~~~
> 
> ./arch/arm64/include/asm/arch_gicv3.h:20:29: note: in expansion of macro ‘write_sysreg_s’
>  #define write_gicreg(v, r)  write_sysreg_s(v, SYS_ ## r)
>                              ^~~~~~~~~~~~~~
> drivers/irqchip/irq-gic-v3.c:790:3: note: in expansion of macro ‘write_gicreg’
>    write_gicreg(0, ICC_AP1R1_EL1);
>    ^~~~~~~~~~~~
> drivers/irqchip/irq-gic-v3.c:791:2: note: here
>   case 5:
>   ^~~~
> 
> Signed-off-by: Matteo Croce <mcroce@...hat.com>
> ---
>  drivers/irqchip/irq-gic-v3.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index 9bca4896fa6f..4a5d220698f6 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -771,8 +771,10 @@ static void gic_cpu_sys_reg_init(void)
>  		case 7:
>  			write_gicreg(0, ICC_AP0R3_EL1);
>  			write_gicreg(0, ICC_AP0R2_EL1);
> +			/* fallthrough */
>  		case 6:
>  			write_gicreg(0, ICC_AP0R1_EL1);
> +			/* fallthrough */
>  		case 5:
>  		case 4:
>  			write_gicreg(0, ICC_AP0R0_EL1);
> @@ -786,8 +788,10 @@ static void gic_cpu_sys_reg_init(void)
>  	case 7:
>  		write_gicreg(0, ICC_AP1R3_EL1);
>  		write_gicreg(0, ICC_AP1R2_EL1);
> +		/* fallthrough */
>  	case 6:
>  		write_gicreg(0, ICC_AP1R1_EL1);
> +		/* fallthrough */
>  	case 5:
>  	case 4:
>  		write_gicreg(0, ICC_AP1R0_EL1);
> 

Already fixed here[1].

	M.

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?h=irq/irqchip-5.3&id=52f8c8b32ea2f2044efcb4214c1857e29f421c5d
-- 
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