linux-kernel - Re: powerpc/cell/oprofile: fix mutex locking for spu-oprofile

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Message-Id: <200808201405.32101.arnd@arndb.de>
Date:	Wed, 20 Aug 2008 14:05:31 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Robert Richter <robert.richter@....com>
Cc:	linuxppc-dev@...abs.org, cbe-oss-dev@...abs.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	oprofile-list@...ts.sourceforge.net,
	Paul Mackerras <paulus@...ba.org>, cel <cel@...ux.vnet.ibm.com>
Subject: Re: powerpc/cell/oprofile: fix mutex locking for spu-oprofile

On Wednesday 20 August 2008, Robert Richter wrote:
> I am fine with the changes with the exception of removing
> add_event_entry() from include/linux/oprofile.h. Though there is no
> usage of the function also in other architectures anymore, this change
> in the API should be discussed on the oprofile mailing list. Please
> separate the change in a different patch and submit it to the mailing
> list. If there are no objections then, this change can go upstream as
> well.

As an explanation, the removal of add_event_entry is the whole point
of this patch. add_event_entry must only be called with buffer_mutex
held, but buffer_mutex itself is not exported.
I'm pretty sure that no other user of add_event_entry exists, as it
was exported specifically for the SPU support and that never worked.
Any other (theoretical) code using it would be broken in the same way
and need a corresponding fix.

We can easily leave the declaration in place, but I'd recommend removing
it eventually. If you prefer to keep it, how about marking it as
__deprecated?

	Arnd <><
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