netdev - Re: [PATCH net-next] net:drivers/net: Miscellaneous conversions to ETH

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Date:	Thu, 3 Oct 2013 07:41:27 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Joe Perches <joe@...ches.com>
cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Kalle Valo <kvalo@....qualcomm.com>,
	netdev <netdev@...r.kernel.org>, ath10k@...ts.infradead.org
Subject: Re: [PATCH net-next] net:drivers/net: Miscellaneous conversions to
 ETH_ALEN



On Wed, 2 Oct 2013, Joe Perches wrote:

> On Thu, 2013-10-03 at 00:38 +0200, Julia Lawall wrote:
> > 
> > 
> > On Wed, 2 Oct 2013, Joe Perches wrote:
> > 
> > > On Wed, 2013-10-02 at 10:44 -0700, Luis R. Rodriguez wrote:
> > > > On Tue, Oct 1, 2013 at 11:40 PM, Joe Perches <joe@...ches.com> wrote:
> > > > > Please include netdev.  (cc'd)
> > > > >
> > > > >> Joe Perches <joe@...ches.com> writes:
> > > > >>
> > > > >> > Convert the memset/memcpy uses of 6 to ETH_ALEN
> > > > >> > where appropriate.
> > > > >
> > > > >> > Signed-off-by: Joe Perches <joe@...ches.com>
> > > > 
> > > > I think these sorts of patches are good -- but once applied it'd be
> > > > good if we can get the SmPL grammar expressed for it and then have
> > > > developers / maintainers regularly doing:
> > > > 
> > > > make coccicheck MODE=patch M=path > path-cocci.patch
> > > > 
> > > > Unfortunately right now MODE=patch takes about 3 1/2 minutes for
> > > > ath9k, MODE=org takes ~10 minutes for ath9k (17 minutes for all of
> > > > ath/), and MODE=context takes ~8 minutes on ath9k -- I do believe its
> > > > a bit unreasonable to expect patch submitters to use this, but
> > > > certainly great practice. Some of the time differences on the reports
> > > > can be explained by the fact that some SmPL will only be used for some
> > > > modes.
> > > > 
> > > > Even though it takes a while right now it'd be great practice to use
> > > > coccicheck to prevent these type of changes from going in again,
> > > > things that checkpatch.pl won't be able to catch.
> > > 
> > > As far as I can tell, it's basically not possible for cocci to
> > > do this conversion.
> > 
> > I tried looking for memcpys and memsets that do use ETH_ALEN and then 
> > seeing what non-local functions the affected values flow to.  I then 
> > marked all of the calls to memcpy and memset that use 6 where an affected 
> > value flows to one of the functions identified in the first pass.  I get 
> > 40 unique results on Linux 3.10.
> > 
> > The semantic patch is below.  It needs to be cleaned up to not return 
> > duplicate results.  It needs to be run with the argument --no-show-diff, 
> > and the result is printed in emacs org mode.
> 
> This has been running a _long_ time (broken?) on
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> 
> $ spatch --version
> spatch version 1.0.0-rc14 without Python support and with PCRE support

Likewise.  I can look at it, but generally I just use a timeout.

Note that you should run it on a whole directory, not on a file at a time, 
so that it can collectthe most possible information on the first pass.

julia
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