linux-kernel - Re: [RFC part1 PATCH 3/7] ACPI / processor_core: Rework _PDC related stuff to make it more arch-independent

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Message-ID: <20131203164623.GB13447@srcf.ucam.org>
Date:	Tue, 3 Dec 2013 16:46:23 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Rutland <mark.rutland@....com>,
	Jon Masters <jonathan@...masters.org>, patches@...aro.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	linaro-acpi@...ts.linaro.org,
	Graeme Gregory <graeme.gregory@...aro.org>
Subject: Re: [RFC part1 PATCH 3/7] ACPI / processor_core: Rework _PDC
 related stuff to make it more arch-independent

On Wed, Dec 04, 2013 at 12:36:47AM +0800, Hanjun Guo wrote:

> +#if defined(CONFIG_X86) || defined(CONFIG_IA64)
>  	/* Enable coordination with firmware's _TSD info */
>  	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
> +	if (boot_option_idle_override == IDLE_NOMWAIT) {
> +		/*
> +		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
> +		 * mode will be disabled in the parameter of _PDC object.
> +		 * Of course C1_FFH access mode will also be disabled.
> +		 */
> +		buf[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
> +
> +	}
> +#endif

This is (fairly) arch-specific, so why not move it to 
arch_acpi_set_pdc_bits()?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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