linux-kernel - Re: [PATCH] x86: Use fallthrough pseudo-keyword

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Date:   Mon, 17 Aug 2020 15:02:27 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        "Gustavo A. R. Silva" <kernel.org@...eddedor>
Subject: Re: [PATCH] x86: Use fallthrough pseudo-keyword

On Tue, Jul 07, 2020 at 03:03:03PM -0500, Gustavo A. R. Silva wrote:
> Replace the existing /* fall through */ comments and its variants with
> the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
> fall-through markings when it is the case.
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

...

> @@ -362,7 +361,6 @@ static short get_segment_selector(struct pt_regs *regs, int seg_reg_idx)
>  		case INAT_SEG_REG_GS:
>  			return vm86regs->gs;
>  		case INAT_SEG_REG_IGNORE:
> -			/* fall through */
>  		default:
>  			return -EINVAL;
>  		}
> @@ -386,7 +384,6 @@ static short get_segment_selector(struct pt_regs *regs, int seg_reg_idx)
>  		 */
>  		return get_user_gs(regs);
>  	case INAT_SEG_REG_IGNORE:
> -		/* fall through */
>  	default:
>  		return -EINVAL;
>  	}

What's the logic for those two to not get a fallthrough; marker?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette