linux-kernel - Re: [PATCH 1/4] ACPICA: Add <acpi/platform/aclinuxxf.h> to remove mis-ordered inclusion of <acpi/actypes.h> from <acpi/platform/aclinux.h>.

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Message-ID: <1465848.IEpXGNryLP@vostro.rjw.lan>
Date:	Tue, 22 Apr 2014 13:16:02 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	"Zheng, Lv" <lv.zheng@...el.com>
Cc:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 1/4] ACPICA: Add <acpi/platform/aclinuxxf.h> to remove mis-ordered inclusion of <acpi/actypes.h> from <acpi/platform/aclinux.h>.

On Tuesday, April 22, 2014 02:01:57 AM Zheng, Lv wrote:
> Hi,
> 
> <skip>
> 
> > > +#define ACPI_NATIVE_INTERFACE_HEADER	<acpi/platform/aclinuxxf.h>
> > 
> > This is not good.
> > 
> > We don't do things like this in the kernel, because they are confusing and hard
> > to debug if necessary, so please find a different way to make this work.
> 
> I use this extra header file to collect:

I was not talking about the new header, which is basically OK, but about the
#define above, which is just too confusing to live.

Please use header file paths directly with #include.

> 1. static inline OSL functions
> 2. divergences of prototypes that haven't been back ported to ACPICA.
> This file is useful for ACPICA release automation.
> 
> There are the following concerns that lead to the use of this solution:
> 1. for this extra header file itself
>     A. The new header file is OSPM specific, thus it needn't be upstreamed to ACPICA;
>     B. Since it needn't be upstreamed to ACPICA, ACPICA needn't determine the name of this extra header;
>     C. It has to be the last file included by <acpi/acpi.h>.
> 2. for the file that includes this extra header file
>     A. Currently there is no OSPM specific code in <acpi/acpi.h>.
> Thus I use a macro so that there is still no OSPM specific code in <acpi/acpi.h> and the name of the extra header can be determined by OSPM.
> 
> If you want another solution, is the following acceptable?
> 1. In <acpi/platform/aclinux.h>
>     #define ACPI_INCLUDE_EXTRA_NATIVE_HEADER	1
> 2. In <acpi/acpi.h> <- this is an ACPICA header file, 
>     #ifdef ACPI_INCLUDE_EXTRA_NATIVE_HEADER
>     #include <acpi/platform/acextra.h>
>     #endif
> Note that in this solution, the name of the extra header file will be determined by ACPICA.

I think I see what you're trying to do now.  And I see that this ACPI_NATIVE_INTERFACE_HEADER
thing is already there in the Linus' tree which is not good at all.

I probably would create an extra ACPICA header, something like <acpios_opt.h>,
that would be empty for all hosts except for Linux and that would contain the
stuff you want to put into acextra.h in Linux.

That would be clean enough I suppose?

Rafael

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