linux-kernel - Re: [PATCH] ice: Fix clang -Wimplicit-fallthrough in ice_pull_qvec_from

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Date:   Tue, 19 Oct 2021 08:32:31 -0700
From:   Jesse Brandeburg <jesse.brandeburg@...el.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>
CC:     Nick Desaulniers <ndesaulniers@...gle.com>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>
Subject: Re: [PATCH] ice: Fix clang -Wimplicit-fallthrough in
 ice_pull_qvec_from_rc()

On 10/18/2021 6:42 PM, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/net/ethernet/intel/ice/ice_lib.c:1906:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
>          default:
>          ^
> drivers/net/ethernet/intel/ice/ice_lib.c:1906:2: note: insert 'break;' to avoid fall-through
>          default:
>          ^
>          break;
> 1 error generated.
> 
> Clang is a little more pedantic than GCC, which does not warn when
> falling through to a case that is just break or return. Clang's version
> is more in line with the kernel's own stance in deprecated.rst, which
> states that all switch/case blocks must end in either break,
> fallthrough, continue, goto, or return. Add the missing break to silence
> the warning.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1482
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>