linux-kernel - Re: [RFC PATCH] checkpatch: check for function calls with struct or union on stack

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Message-ID: <0a6d2ecfacf3786228de664c8e01f6de10314c1b.camel@perches.com>
Date:   Fri, 27 Jul 2018 03:08:52 -0700
From:   Joe Perches <joe@...ches.com>
To:     David Laight <David.Laight@...LAB.COM>,
        'Andrew Morton' <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] checkpatch: check for function calls with struct or
 union on stack

On Fri, 2018-07-27 at 10:04 +0000, David Laight wrote:
> From: Andrew Morton
> > Sent: 26 July 2018 20:28
> > On Thu, 26 Jul 2018 12:25:33 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
> > 
> > > I'll give it a spin, see how noisy it is.
> > 
> > Actually, I would prefer if the message, changelog and title
> > used the term "passed by value".  It's a more familiar term
> > and it is possible for a passed-by-value aggregate to in fact
> > be passed in registers.
> 
> You need to detect (and ignore) 'small' structures.

checkpatch is stupid and basically can't do that
as it has no context other than the current line.

It would need a list of specific struct types to
ignore.  Care to create and send that list to me?

>From an earlier message:

On Thu, 2018-07-26 at 13:05 -0700, Joe Perches wrote:
> It doesn't seem noisy at all, but maybe there are a few
> known structs like "struct timespec64" that could be
> excluded.