linux-kernel - Re: [PATCH v2 0/3] Add code to release secondary cores from holding pen.

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Message-ID: <5577EF43.6020600@st.com>
Date:	Wed, 10 Jun 2015 10:03:15 +0200
From:	Maxime Coquelin <maxime.coquelin@...com>
To:	Kevin Hilman <khilman@...nel.org>,
	Peter Griffin <peter.griffin@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <srinivas.kandagatla@...il.com>,
	<patrice.chotard@...com>, <arnd@...db.de>, <olof@...om.net>,
	<lee.jones@...aro.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] Add code to release secondary cores from holding
 pen.

Hi Kevin,

On 06/09/2015 05:43 PM, Kevin Hilman wrote:
> Peter Griffin <peter.griffin@...aro.org> writes:
>
>> Hi Maxime, Patrice, Srini, Kevin, Olof & Arnd,
>>
>> This patchset adds in the necessary code to manage the holding pen for STi
>> platforms.
>>
>> Due to all the STi upstream devs using JTAG to boot the STi boards, there
>> is currently a SMP bug when booting upstream kernels via u-boot where
>> only the primary core is brought up.
>>
>> This hasn't been noticed until now because when booting via JTAG the
>> stlinux_arm_boot script sets the PC of the secondary cores directly.
>>
>> With these patches applied booting via u-boot now works correctly.
>>
>> [    0.045456] CPU: Testing write buffer coherency: ok
>> [    0.045597] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
>> [    0.045734] Setting up static identity map for 0x40209000 - 0x40209098
>> [    0.065047] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>> [    0.065081] Brought up 2 CPUs
>> [    0.065089] SMP: Total of 2 processors activated (5983.43 BogoMIPS).
>> [    0.065092] CPU: All CPU(s) started in SVC mode.
>>
>> Kevin / Olof / Arnd - Can you put this fix into the next ARM SoC fixes pull
>> request (if there is one)?
> At this stage of the cycle (we're already at -rc7) we limit things to
> strictly regression fixes, and seems this has been broken for some time,
> so I think this will have to wait for v4.2.
>
> After addresing the comments, Maxime should queue this up for arm-soc so
> we can get it in early in the v4.2-rc cycle.

Ok, I will take it for v4.2-rc cycle.

Thanks,
Maxime
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