linux-kernel - Re: [PATCH v2 07/32] perf/x86/intel/cqm: add helpers for per-package locking

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Date:	Wed, 18 May 2016 21:09:38 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Carrillo-Cisneros <davidcc@...gle.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Tony Luck <tony.luck@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Paul Turner <pjt@...gle.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/32] perf/x86/intel/cqm: add helpers for per-package
 locking

On Wed, 18 May 2016, Thomas Gleixner wrote:
> On Wed, 11 May 2016, David Carrillo-Cisneros wrote:

> > +	cqm_pkg_id_for_each_online(i)
> > +		mutex_lock_nested(&cqm_pkgs_data[i]->pkg_data_mutex, i);

Peter just pointed out that this will fail when the number of nest levels
exceeds 8. So any system with more than 8 packages will make lockdep explode.

Thanks,

	tglx