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

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Date:	Thu, 16 Dec 2010 13:40:37 -0800
From:	Jeff Ohlstein <johlstei@...eaurora.org>
To:	Catalin Marinas <catalin.marinas@....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,
	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

Catalin Marinas wrote:
> 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).
>   

I was trying to make the code as similar to the realview code as I
reasonably could. There are several instances of that, we could fix all
of them in one go.

-Jeff

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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