linux-kernel - Re: [PATCH 3/4] tracing: Remove redundant module.h includes

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Message-ID: <20150410145436.6320a3a6@gandalf.local.home>
Date:	Fri, 10 Apr 2015 14:54:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:	pebolle@...cali.nl, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] tracing: Remove redundant module.h includes

On Fri, 10 Apr 2015 13:25:04 -0500
Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:

> On Fri, 2015-04-10 at 12:27 -0400, Steven Rostedt wrote:
> > On Fri, 10 Apr 2015 11:05:02 -0500
> > Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:
> > 
> > > kallsyms.h now includes module.h, so remove module.h includes that
> > > were apparently there only to satisfy kallsyms use of MODULE_NAME_LEN.
> > 
> > Only remove it for those that need it for MODULE_NAME_LEN because it
> > was used in KSYM_SYMBOL_LEN. But not the rest. Lots of these files use
> > module code directly. Now you made it require kallsyms.h to get to that
> > code. If for some reason we no longer need kallsyms.h, or that
> > kallsyms.h no longer needs module.h, these files will not build.
> > 
> > If code uses module code, it must include module.h.
> > 
> 
> I had grepped all those files for 'module' and didn't find anything
> other than comments.  The only files of those affected that use
> KSYM_SYMBOL_LEN are trace_output and trace_syscalls, so I can respin the
> patch including just those.
> 

Hmm, I thought I did have some stuff in there for modules. Maybe not
anymore.

> But I don't see that any of the other files really use module code, and
> looking at those again, none of them seem to need kallsyms either so
> they could remove those includes as well...  But I agree all that that
> probably doesn't belong as part of this patchset.
> 
> > So NACK for this patch.
> > 
> > To see what needs module.h, before reverting this patch, remove the
> > module.h from kallsyms.h, and also remove the MODULE_NAME_LEN from it as
> > well. Compile all the tracing code, and see what does not build. Those
> > files will be the ones that you need to add back the module.h to.
> > 
> 
> Yeah, doing that I didn't see any build errors, but I'll stick with just
> the explicit KSYM_SYMBOL_LEN-using files for this patchset to keep
> things restricted to the specific case at hand.
> 

Yeah, if they still compile without the module.h either in kallsyms, or
explicitly being called, then it should be OK to remove them. And yes,
in another patch.

-- Steve
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