CHECK: Alignment should match open parenthesis

[Nicholas Mc Guire]

On Fri, 13 Mar 2015, Nicholas Mc Guire wrote:

> On Fri, 13 Mar 2015, palik imre wrote:
> 
> > On Friday, 13 March 2015, 13:43, Nicholas Mc Guire <der.herr at hofr.at> wrote:
> > > On Fri, 13 Mar 2015, palik imre wrote:
> > > 
> > > 
> > > > Sorry for the silly question, but I have some issues with this checkpatch.pl warning.
> > > >
> > > > I mean Documentation/CodingStyle says:
> > > >
> > > > Outside of comments, documentation and except in Kconfig, spaces are never
> > > > used for indentation, and the above example is deliberately broken.
> > > >
> > > > But checkpatch.pl claims I should align to open parentheses.  These two things seem to be contradictory to me.  Could somebody clarify this?
> > > 
> > > >
> > > leading tabs *followed* by spaces to align parameters to a function are fine
> > 
> > The emacs settings in Documentation/CodingStyle seem to contradict to you,
> > as it is set up to use c-lineup-arglist-tabs-only
> >
> The problem is that CodingStyle does not explicitly address
> parameter alignment for functions that do not fit on a single line
> but checkpatch.pl does
> 
> you can try it out - if you align to the opening braces with spaces
> with preceding TABs it will not fuss and this is also common practice.
>
here is a quick shot at summarizing this

 
If the parameter list to a functions would exceed the 80 char limit then break
it at the separators, and align to opening braces, e.g.:

			ret = fw_load_from_user_helper(fw, name, device,
						       opt_flags, timeout);

or:

	int =
	wait_for_completion_interruptible_timeout(data->completion,             
						  PMI_TIMEOUT);

Note that this is indented by tabs and then aligned with spaced to fit the 
opening braces. If you can not fit it even if you break the parameter list
at the commas then indent by tabs only but *significantly* to the left of
the opening braces, e.g.:

		int ret = wait_for_completion_interruptible_timeout( 
				&info->done, usecs_to_jiffies(TIMEOUT_US));


would be suprised if there is no writeup somewhere alredy
but I did not find this covered in Documentations anywhere.

thx!
hofrat