linux-kernel - Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

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Message-Id: <200702161814.26855.arnd@arndb.de>
Date:	Fri, 16 Feb 2007 18:14:26 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Maynard Johnson <maynardj@...ibm.com>
Cc:	cbe-oss-dev@...abs.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, oprofile-list@...ts.sourceforge.net,
	Carl Love <cel@...ibm.com>
Subject: Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

On Friday 16 February 2007 01:32, Maynard Johnson wrote:
> config OPROFILE_CELL
>         bool "OProfile for Cell Broadband Engine"
>         depends on OPROFILE && SPU_FS
>         default y if ((SPU_FS = y && OPROFILE = y) || (SPU_FS = m && 
> OPROFILE = m))
>         help
>           Profiling of Cell BE SPUs requires special support enabled
>           by this option.  Both SPU_FS and OPROFILE options must be
>           set 'y' or both be set 'm'.
> =============
> 
> Can anyone see a problem with any of this . . . or perhaps a suggestion 
> of a better way?

The text suggests it doesn't allow SPU_FS=y with OPROFILE=m, which I think
should be allowed. I also don't see any place in the code where you actually
use CONFIG_OPROFILE_CELL.

Ideally, you should be able to have an oprofile_spu module that can be
loaded after spufs.ko and oprofile.ko. In that case you only need

config OPROFILE_SPU
	depends on OPROFILE && SPU_FS
	default y

and it will automatically build oprofile_spu as a module if one of the two
is a module and won't build it if one of them is disabled.

	Arnd <><
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