linux-kernel - Re: [PATCH v5 4/5] msm: hotplug: support cpu hotplug on msm

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Message-ID: <AANLkTinzVP4rjOZM0PZQGYBNm+z-O=S0h6vo1QVoh+ps@mail.gmail.com>
Date:	Thu, 16 Dec 2010 12:55:28 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Jeff Ohlstein <johlstei@...eaurora.org>
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,
	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 v5 4/5] msm: hotplug: support cpu hotplug on msm

On 16 December 2010 06:54, Jeff Ohlstein <johlstei@...eaurora.org> wrote:
> --- /dev/null
> +++ b/arch/arm/mach-msm/hotplug.c
[...]
> +static inline void platform_do_lowpower(unsigned int cpu)
> +{
> +       /* Just enter wfi for now. TODO: Properly shut off the cpu. */
> +       for (;;) {
> +               /*
> +                * here's the WFI
> +                */
> +               asm(".word      0xe320f003\n"
> +                   :
> +                   :
> +                   : "memory", "cc");

Is this for an ARMv7 platform? If yes, you could just use the WFI
instruction directly (and it would also work if compiling the kernel
to Thumb-2 mode).

-- 
Catalin
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