linux-kernel - Re: [PATCH v2] ACPI: Cleanup <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi

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Date:	Tue, 26 Nov 2013 12:54:09 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Lv Zheng <lv.zheng@...el.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	linux-acpi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ACPI: Cleanup <acpi/acpi.h>, <acpi/acpi_bus.h> and
 <acpi/acpi_drivers.h> inclusions.

On Tue, Nov 26, 2013 at 09:29:33PM +0100, Rafael J. Wysocki wrote:
> On Tuesday, November 26, 2013 01:21:15 PM Lv Zheng wrote:
> > Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and
> > <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions.
> > 
> > First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>
> > should not be included directly from any files that are built for
> > CONFIG_ACPI unset, because that generally leads to build warnings about
> > undefined symbols in !CONFIG_ACPI builds.  For CONFIG_ACPI set,
> > <linux/acpi.h> includes those files and for !CONFIG_ACPI it provides stub
> > ACPI symbols to be used in that case.
> > 
> > Second, there are ordering dependencies between those files that always
> > have to be met.  Namely, it is required that <acpi/acpi_bus.h> be included
> > prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the
> > latter depends on are always there.  And <acpi/acpi.h> which provides
> > basic ACPICA type declarations should always be included prior to any other
> > ACPI headers in CONFIG_ACPI builds.  That also is taken care of including
> > <linux/acpi.h> as appropriate.
> > 
> > This patch also includes necessary cleanups in the affected files where
> > other ACPI headers is also included but not referenced.
> >
> 
> This looks OK to me, but it touches several other subsystems.  It's better to
> CC such things to linux-kernel at least.
> 
> Peter, Matthew, Tony, Konrad, Greg, Bjorn, do you have any objections against this?

None from me, nice cleanups.

greg k-h
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