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Subject: Re: [PATCH RFC 11/14] arm64: Move the ASID allocator code in a
 separate file
To:     Guo Ren <guoren@kernel.org>
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        Marc Zyngier <marc.zyngier@arm.com>, catalin.marinas@arm.com,
        julien.thierry@arm.com, will.deacon@arm.com,
        christoffer.dall@arm.com, james.morse@arm.com
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From:   Julien Grall <julien.grall@arm.com>
Message-ID: <aafb3478-ce7b-3771-c03a-58510261f01c@arm.com>
Date:   Wed, 19 Jun 2019 13:52:02 +0100
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Hi Guo,

On 19/06/2019 12:51, Guo Ren wrote:
> On Wed, Jun 19, 2019 at 4:54 PM Julien Grall <julien.grall@arm.com> wrote:
>>
>>
>>
>> On 6/19/19 9:07 AM, Guo Ren wrote:
>>> Hi Julien,
>>
>> Hi,
>>
>>>
>>> You forgot CCing C-SKY folks :P
>>
>> I wasn't aware you could be interested :).
>>
>>>
>>> Move arm asid allocator code in a generic one is a agood idea, I've
>>> made a patchset for C-SKY and test is on processing, See:
>>> https://lore.kernel.org/linux-csky/1560930553-26502-1-git-send-email-guoren@kernel.org/
>>>
>>> If you plan to seperate it into generic one, I could co-work with you.
>>
>> Was the ASID allocator work out of box on C-Sky?
> Almost done, but one question:
> arm64 remove the code in switch_mm:
>    cpumask_clear_cpu(cpu, mm_cpumask(prev));
>    cpumask_set_cpu(cpu, mm_cpumask(next));


> 
> Why? Although arm64 cache operations could affect all harts with CTC
> method of interconnect, I think we should
> keep these code for primitive integrity in linux. Because cpu_bitmap
> is in mm_struct instead of mm->context.

I will let Will answer to this.

[...]

>> If so, I can easily move the code in a generic place (maybe lib/asid.c).
> I think it's OK.

Will emits concern to move the code in lib. So I will stick with what I 
currently have.

Cheers,

-- 
Julien Grall