linux-kernel - Re: [PATCH 16/23] x86/bugs: Remove default case for fully switched enums

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Message-ID: <20230902090216.GAZPL6GF8qIT9AGc9a@fat_crate.local>
Date:   Sat, 2 Sep 2023 11:02:16 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Babu Moger <babu.moger@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, David.Kaplan@....com,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Nikolay Borisov <nik.borisov@...e.com>,
        gregkh@...uxfoundation.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 16/23] x86/bugs: Remove default case for fully switched
 enums

On Fri, Aug 25, 2023 at 12:01:47AM -0700, Josh Poimboeuf wrote:
> For enum switch statements which handle all possible cases, remove the
> default case so a compiler warning gets printed if one of the enums gets
> accidentally omitted from the switch statement.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
> ---
>  arch/x86/kernel/cpu/bugs.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)

You could just as well take care of the default: cases in
update_srbds_msr(), retbleed_select_mitigation(), unpriv_ebpf_notify(),
spectre_v2_parse_user_cmdline() and cpu_show_common() and get rid of
them all in this file and have the compiler warn for all of them.

Thx.

-- 
Regards/Gruss,
    Boris.

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