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Date:   Wed, 20 Feb 2019 12:12:43 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] intel_th: Mark expected switch fall-throughs

Hi all,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 2/12/19 3:43 PM, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warnings:
> 
> drivers/hwtracing/intel_th/sth.c: In function ‘sth_stm_packet’:
> drivers/hwtracing/intel_th/sth.c:86:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    reg += 4;
>    ~~~~^~~~
> drivers/hwtracing/intel_th/sth.c:87:2: note: here
>   case STP_PACKET_XSYNC:
>   ^~~~
> drivers/hwtracing/intel_th/sth.c:88:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    reg += 8;
>    ~~~~^~~~
> drivers/hwtracing/intel_th/sth.c:89:2: note: here
>   case STP_PACKET_TRIG:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/hwtracing/intel_th/sth.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/hwtracing/intel_th/sth.c b/drivers/hwtracing/intel_th/sth.c
> index 4b7ae47789d2..3a1f4e650378 100644
> --- a/drivers/hwtracing/intel_th/sth.c
> +++ b/drivers/hwtracing/intel_th/sth.c
> @@ -84,8 +84,12 @@ static ssize_t notrace sth_stm_packet(struct stm_data *stm_data,
>  	/* Global packets (GERR, XSYNC, TRIG) are sent with register writes */
>  	case STP_PACKET_GERR:
>  		reg += 4;
> +		/* fall through */
> +
>  	case STP_PACKET_XSYNC:
>  		reg += 8;
> +		/* fall through */
> +
>  	case STP_PACKET_TRIG:
>  		if (flags & STP_PACKET_TIMESTAMPED)
>  			reg += 4;
> 

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