linux-kernel - Re: [PATCH 2/3] checkpatch: tweak extern in C warning

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Date:   Fri, 25 Jun 2021 21:31:42 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jim Cromie <jim.cromie@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] checkpatch: tweak extern in C warning

On Fri, 2021-06-25 at 21:40 -0600, Jim Cromie wrote:
> The extern-in-C rule has one important exception: the symbol is
> defined in/by the linker script.  By convention, these almost always
> contain: _start, _stop, _end.  Suppress the warning on such symbols.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
> @@ -6910,7 +6910,8 @@ sub process {
>  		    $stat =~ /^.\s*extern\s+/)
>  		{
>  			WARN("AVOID_EXTERNS",
> -			     "externs should be avoided in .c files\n" .  $herecurr);
> +			     "externs should be avoided in .c files\n($stat)\n" .  $herecurr)
> +			    unless $stat =~ /_start|_stop|_end/;

nak.

As far as I can tell, there's no reason these symbols
should not be in .h files.

besides that:

output is single line, $stat should not be used and
using unless is not desired.