linux-kernel - RE: [UPDATE PATCH 4/4] ACPI: Add support to force header inclusion rules for <linux/acpi.h>.

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Date:	Tue, 26 Nov 2013 00:32:12 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lv Zheng <zetalog@...il.com>
CC:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [UPDATE PATCH 4/4] ACPI: Add support to force header inclusion
 rules for <linux/acpi.h>.

Hi, Rafael

> From: Rafael J. Wysocki [mailto:rjw@...ysocki.net]
> Sent: Tuesday, November 26, 2013 8:10 AM
> To: Lv Zheng
> Cc: Wysocki, Rafael J; Brown, Len; Zheng, Lv; linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org
> Subject: Re: [UPDATE PATCH 4/4] ACPI: Add support to force header inclusion rules for <linux/acpi.h>.
> 
> On Saturday, November 23, 2013 07:54:18 AM Lv Zheng wrote:
> > From: Lv Zheng <lv.zheng@...el.com>
> >
> > (Update due to some typo fixes.)
> >
> > As there is only CONFIG_ACPI=n processing in the <linux/acpi.h>, it is not
> > safe to include <acpi/acpi.h>, <acpi/acpi_drivers.h> and <acpi/acpi_bus.h>
> > directly for source out of Linux ACPI subsystems.
> >
> > This patch adds error messaging to warn developers of such wrong
> > inclusions.
> >
> > In order not to be bisected and reverted as a wrong commit, warning
> > messages are carefully split into a seperate patch other than the wrong
> > inclusion cleanups.
> >
> > Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> 
> I don't like this one to be honest.

I generate this to prevent device driver writers to do stupid things before we can sort <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> out.

> 
> > ---
> >  drivers/acpi/acpica/Makefile    |    2 +-
> >  include/acpi/acpi_bus.h         |    5 +++++
> >  include/acpi/acpi_drivers.h     |    5 +++++
> >  include/acpi/platform/aclinux.h |   10 ++++++++++
> >  4 files changed, 21 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
> > index 4383040..7738677 100644
> > --- a/drivers/acpi/acpica/Makefile
> > +++ b/drivers/acpi/acpica/Makefile
> > @@ -2,7 +2,7 @@
> >  # Makefile for ACPICA Core interpreter
> >  #
> >
> > -ccflags-y			:= -Os
> > +ccflags-y			:= -Os -DLINUXIZED_ACPICA
> 
> I don't like this (the naming and the way it is done).
> 
> >  ccflags-$(CONFIG_ACPI_DEBUG)	+= -DACPI_DEBUG_OUTPUT
> >
> >  # use acpi.o to put all files here into acpi.o modparam namespace
> > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> > index 0af9667..0b1ea80 100644
> > --- a/include/acpi/acpi_bus.h
> > +++ b/include/acpi/acpi_bus.h
> > @@ -26,6 +26,11 @@
> >  #ifndef __ACPI_BUS_H__
> >  #define __ACPI_BUS_H__
> >
> > +/* <acpi/acpi_bus.h> is not safe for CONFIG_ACPI=n environment */
> > +#ifndef _LINUX_ACPI_H
> > +#error "Please don't include <acpi/acpi_bus.h> directly, include <linux/acpi.h> instead."
> > +#endif
> 
> And this should either go into all of the <acpi/*.h> files, not only to the two
> of them you chose, or to none of them.  I prefer none.

OK, let it be done for now.  So we need to open eyes on new ACPI commits. :-)

I'll merge patch 2 and 3 and send it with your comments addressed and re-based.

Thanks and best regards
-Lv

> 
> Thanks,
> Rafael