linux-kernel - Re: [PATCH 09/10] x86/intel_rdt: Hot cpu support for Cache Allocation

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Date:	Tue, 16 Jun 2015 10:52:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, matt.fleming@...el.com, will.auld@...el.com,
	linux-rdt@...ists.intel.com
Subject: Re: [PATCH 09/10] x86/intel_rdt: Hot cpu support for Cache
 Allocation

On Fri, 12 Jun 2015, Vikas Shivappa wrote:
> +static inline void intel_rdt_cpu_start(int cpu)
> +{
> +	struct intel_pqr_state *state = &per_cpu(pqr_state, cpu);
> +
> +	state->closid = 0;
> +	mutex_lock(&rdt_group_mutex);

This is called from CPU_STARTING, which runs on the starting cpu with
interrupts disabled. Clearly never tested with any of the mandatory
debug configs enabled.

Thanks

	tglx
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