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Message-ID: <8521c712250bcffce5c71e8d2b2574de786d4572.camel@perches.com>
Subject: Re: [PATCH next v2 2/3] checkpatch: add ethtool_sprintf rules
From:   Joe Perches <joe@perches.com>
To:     Justin Stitt <justinstitt@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Shay Agroskin <shayagr@amazon.com>,
        Arthur Kiyanovski <akiyano@amazon.com>,
        David Arinzon <darinzon@amazon.com>,
        Noam Dagan <ndagan@amazon.com>,
        Saeed Bishara <saeedb@amazon.com>,
        Rasesh Mody <rmody@marvell.com>,
        Sudarsana Kalluru <skalluru@marvell.com>,
        GR-Linux-NIC-Dev@marvell.com,
        Dimitris Michailidis <dmichail@fungible.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
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        NXP Linux Team <linux-imx@nxp.com>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        Steen Hegelund <Steen.Hegelund@microchip.com>,
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        Mengyuan Lou <mengyuanlou@net-swift.com>,
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Cc:     linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Kees Cook <keescook@chromium.org>,
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Date:   Thu, 26 Oct 2023 15:38:39 -0700
In-Reply-To: <20231026-ethtool_puts_impl-v2-2-0d67cbdd0538@google.com>
References: <20231026-ethtool_puts_impl-v2-0-0d67cbdd0538@google.com>
         <20231026-ethtool_puts_impl-v2-2-0d67cbdd0538@google.com>
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On Thu, 2023-10-26 at 21:56 +0000, Justin Stitt wrote:
> Add some warnings for using ethtool_sprintf() where a simple
> ethtool_puts() would suffice.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -7011,6 +7011,25 @@ sub process {
>  			     "Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90\n" . $herecurr);
>  		}
>  
> +# ethtool_sprintf uses that should likely be ethtool_puts
> +		if ($line =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
> +			if(WARN("ETHTOOL_SPRINTF",
> +			   "Prefer ethtool_puts over ethtool_sprintf with only two arguments\n" . $herecurr) &&
> +         $fix) {
> +         $fixed[$fixlinenr] =~ s/ethtool_sprintf\s*\(/ethtool_puts\(/;
> +       }
> +		}
> +
> +		# use $rawline because $line loses %s via sanitization and thus we can't match against it.
> +		if ($rawline =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*\"\%s\"\s*,\s*$FuncArg\s*\)/) {
> +			if(WARN("ETHTOOL_SPRINTF",
> +			   "Prefer ethtool_puts over ethtool_sprintf with standalone \"%s\" specifier\n" . $herecurr) &&
> +         $fix) {
> +         $fixed[$fixlinenr] =~ s/ethtool_sprintf\s*\(\s*(.*?),.*?,(.*?)\)/ethtool_puts\($1,$2)/;

Thanks, but:

This fix wouldn't work if the first argument was itself a function
with multiple arguments.

And this is whitespace formatted incorrectly.

It:

o needs a space after if
o needs a space after the comma in the fix
o needs to use the appropriate amount and tabs for indentation
o needs alignment to open parentheses
o the backslashes are not required in the fix block

Do you want me to push what I wrote in the link below?
https://lore.kernel.org/lkml/7eec92d9e72d28e7b5202f41b02a383eb28ddd26.camel@perches.com/

> +       }
> +		}
> +
> +
>  # typecasts on min/max could be min_t/max_t
>  		if ($perl_version_ok &&
>  		    defined $stat &&
>