linux-kernel - RE: [PATCH] ACPI: remove "config ACPI_DEBUG_FUNC

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Date:	Sun, 7 Apr 2013 07:07:11 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>, Paul Bolle <pebolle@...cali.nl>
CC:	Len Brown <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Moore, Robert" <robert.moore@...el.com>
Subject: RE: [PATCH] ACPI: remove "config ACPI_DEBUG_FUNC_TRACE"

> > > > Kconfig symbol ACPI_DEBUG_FUNC_TRACE was only used (through its
> > > > corresponding macro) in drivers/acpi/acpica/acmacros.h. That macro
> > > > was removed from that header in v3.8, with commit
> > > > 86ff0e508f88eda6e479a897476026055831d2d8 ("ACPICA: Fix unmerged
> > > > acmacros.h divergences."). That commit did not explain why that
> > > > macro was removed. But it seems that ACPI_DEBUG_FUNC_TRACE can
> > now
> > > > be removed too, as it is unused.
> > >
> > > Lv, can you please comment here?
> >
> > Sorry for the delayed reply.
> >
> > The commit should have done something that already have been done in
> > the ACPICA.
> > I'll take a look at this.
> 
> The original commit deleted CONFIG_ACPI_DEBUG_FUNC_TRACE from
> acmacros.h as it is in the __wrong__ place.
> CONFIG_xxx is linux specific codes thus should appear in OSL layer - aclinux.h.
> ACPICA specific codes should only use selective definitions in #ifdef ACPI_xxx
> style and such codes should be merged into ACPICA rather than being merged
> into Linux ACPI.
> 
> Now we have two choices:
> Re-implement it in the aclinux.h using "ACPI_DEBUG_OUTPUT"
> defined/undefined or delete this kernel configuration item temporarily.

Sorry, I made a mistake here.
ACPI_DEBUG_OUTPUT is already covered by the CONFIG_ACPI_DEBUG.
The corrected statement should be:
If we want to fine tune the output, then the codes might be implemented in ACPICA first and then get utilized in Linux using the new ACPICA feature.

Best regards
-Lv