netdev - Re: [RFC PATCH net-next v1 11/11] drivers/net/ethernet: clean up mis-targeted comments

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Date:   Fri, 11 Sep 2020 15:26:42 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Edward Cree <ecree@...arflare.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        <netdev@...r.kernel.org>, <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [RFC PATCH net-next v1 11/11] drivers/net/ethernet: clean up
 mis-targeted comments

On Fri, 11 Sep 2020 22:55:54 +0100 Edward Cree wrote:
> On 11/09/2020 22:42, Jesse Brandeburg wrote:
> > Thanks Ed, I think I might just remove the /** on that function then
> > (removing it from kdoc processing)  
> I dunno, that means
> a) kerneldoc won't generate html for this struct
> b) new additions to the struct without corresponding kerneldoc won't
>    generate warnings
>  both of which are not ideal outcomes.
> I realise there's value in having totally warning-clean code, but in
>  this case I think this one warning, even though it's indicating a
>  toolchain problem rather than a codebase problem, should better stay
>  (if only to put pressure on the toolchain to fix it).
> Otherwise, when and if the toolchain is fixed, what's the chance we'll
>  remember to put the /** back?
> 
> That's just my opinion, though; I won't block patches that disagree.

"Toolchain" sounds a little grand in this context, the script that
parses kdoc does basic regexps to convert the standard kernel macros:

	# replace DECLARE_BITMAP
	$members =~ s/__ETHTOOL_DECLARE_LINK_MODE_MASK\s*\(([^\)]+)\)/DECLARE_BITMAP($1, __ETHTOOL_LINK_MODE_MASK_NBITS)/gos;
	$members =~ s/DECLARE_BITMAP\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[BITS_TO_LONGS($2)\]/gos;
	# replace DECLARE_HASHTABLE
	$members =~ s/DECLARE_HASHTABLE\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[1 << (($2) - 1)\]/gos;
	# replace DECLARE_KFIFO
	$members =~ s/DECLARE_KFIFO\s*\(([^,)]+),\s*([^,)]+),\s*([^,)]+)\)/$2 \*$1/gos;
	# replace DECLARE_KFIFO_PTR
	$members =~ s/DECLARE_KFIFO_PTR\s*\(([^,)]+),\s*([^,)]+)\)/$2 \*$1/gos;

IDK if we can expect it to understand random driver's macros..


This is the only use of _MCDI_DECLARE_BUF() in the tree, how about
converting the declaration to:

#declare _MCDI_BUF_LEN(_len)   DIV_ROUND_UP(_len, 4)

	efx_dword_t txbuf[_MCDI_BUF_LEN(MC_CMD_PTP_IN_TRANSMIT_LENMAX)];

Would that work?