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Message-ID: <364fa8ca-80b0-a3b6-6d83-7a9c89b0ac82@bytedance.com>
Date:   Wed, 7 Sep 2022 22:50:41 +0800
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Subject: Re: [PATCH v3] arm64: run softirqs on the per-CPU IRQ stack
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To:     Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Arnd Bergmann <arnd@arndb.de>,
        Mark Rutland <mark.rutland@arm.com>
References: <20220815124739.15948-1-zhengqi.arch@bytedance.com>
 <595c912a-1503-d420-f32f-297b824decae@bytedance.com>
 <430e3e5f-d446-6307-cba0-6f859bce560f@bytedance.com>
 <20220907133426.GA30248@willie-the-truck>
From:   Qi Zheng <zhengqi.arch@bytedance.com>
In-Reply-To: <20220907133426.GA30248@willie-the-truck>
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On 2022/9/7 21:34, Will Deacon wrote:
> On Wed, Sep 07, 2022 at 03:04:48PM +0800, Qi Zheng wrote:
>>
>>
>> On 2022/8/26 12:16, Qi Zheng wrote:
>>>
>>>
>>> On 2022/8/15 20:47, Qi Zheng wrote:
>>>> Currently arm64 supports per-CPU IRQ stack, but softirqs
>>>> are still handled in the task context.
>>>>
>>>> Since any call to local_bh_enable() at any level in the task's
>>>> call stack may trigger a softirq processing run, which could
>>>> potentially cause a task stack overflow if the combined stack
>>>> footprints exceed the stack's size, let's run these softirqs
>>>> on the IRQ stack as well.
>>>>
>>>> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
>>>> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>>>> Acked-by: Will Deacon <will@kernel.org>
>>>> ---
>>>> v2: https://lore.kernel.org/lkml/20220802065325.39740-1-zhengqi.arch@bytedance.com/
>>>> v1: https://lore.kernel.org/lkml/20220708094950.41944-1-zhengqi.arch@bytedance.com/
>>>> RFC: https://lore.kernel.org/lkml/20220707110511.52129-1-zhengqi.arch@bytedance.com/
>>>>
>>>> Changelog in v2 -> v3:
>>>>    - rebase onto the v6.0-rc1
>>
>> Hi Will,
>>
>> Are we good to merge this patch? Or if there is anything else I need to
>> do, please let me know. :)
> 
> I'm expecting Catalin to pick this one up for 6.1.

Oh, I see. Looking forward to this.

Thanks a lot.
Qi

> 
> Will

-- 
Thanks,
Qi