From: Catalin Marinas <catalin.marinas@arm.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Zhaoyang Huang <zhaoyang.huang@linaro.org>,
zhaoyang.huang@spreadtrum.com, will.deacon@arm.com,
linux-kernel@vger.kernel.org, hanjun.guo@linaro.org,
suzuki.poulose@arm.com, Mark Rutland <mark.rutland@arm.com>
Subject: Re: [RFC PATCH] Add IPI entry for CPU UP
Date: Mon, 11 Jan 2016 10:06:44 +0000 [thread overview]
Message-ID: <20160111100644.GD9554@e104818-lin.cambridge.arm.com> (raw)
In-Reply-To: <20160111095925.GA17852@red-moon>
On Mon, Jan 11, 2016 at 09:59:25AM +0000, Lorenzo Pieralisi wrote:
> On Mon, Jan 11, 2016 at 03:10:40PM +0800, Zhaoyang Huang wrote:
> > In some ARM SOCs, IPI interrupt is used for hotplug in one cpu, that is,
> > sending a IPI to the core in WFI and powerdown status. So Add a IPI
> > entry for handle this kind of cpu up interrupt
>
> On arm64 SOCs, with a mainline kernel, you can only hotplug CPUs out
> and back in by using the PSCI firmware interface, which does not
> require an IPI to boot a CPU, therefore this patch is useless.
I fully agree.
BTW, such patches should cc linux-arm-kernel@lists.infradead.org as well
since they are ARM related.
--
Catalin
next prev parent reply other threads:[~2016-01-11 10:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-11 7:10 Zhaoyang Huang
2016-01-11 9:59 ` Lorenzo Pieralisi
2016-01-11 10:06 ` Catalin Marinas [this message]
2016-01-11 10:55 ` Zhaoyang Huang (黄朝阳)
2016-01-11 11:03 ` Mark Rutland
2016-01-11 11:21 ` Zhaoyang Huang
2016-01-11 11:37 ` Mark Rutland
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