linux-kernel - Re: [PATCH v3 4/5] msm: hotplug: support cpu hotplug on msm

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Message-ID: <AANLkTimkUpgPD5BdjL-3aV=miJwbT0OOWAJJ+V7LUhbP@mail.gmail.com>
Date:	Mon, 13 Dec 2010 15:12:15 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	ykaoua@...lcomm.com
Cc:	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jeff Ohlstein <johlstei@...eaurora.org>,
	Brian Swetland <swetland@...gle.com>,
	Dima Zavin <dima@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v3 4/5] msm: hotplug: support cpu hotplug on msm

On 13 December 2010 01:20,  <ykaoua@...lcomm.com> wrote:
> --- /dev/null
> +++ b/arch/arm/mach-msm/hotplug.c
[...]
> +static inline void platform_do_lowpower(unsigned int cpu)
> +{
> +       /* Just enter wfe for now. */
> +       for (;;) {
> +               asm("wfe");
> +               if (pen_release == cpu) {
> +                       /*
> +                        * OK, proper wakeup, we're done
> +                        */
> +                       break;
> +               }
> +               smp_rmb();

Do you need some barrier after wfe?

-- 
Catalin