Re: [PATCH 6.6 000/175] 6.6.144-rc1 review

[Jonas Jelonek]

Hi Sasha,

On 10.07.26 23:03, Sasha Levin wrote:
> On Thu, Jul 09, 2026 at 11:45:14AM +0200, Florian Fainelli wrote:
>> On ARCH_BRCMSTB using 32-bit and 64-bit ARM kernels, same build failure
>> as 6.1 for MIPS:
>>
>> arch/mips/kernel/smp.c: In function 'stop_this_cpu':
>> arch/mips/kernel/smp.c:396:2: error: implicit declaration of function
>> 'rcutree_report_cpu_dead'; did you mean 'rcutree_prepare_cpu'?
>> [-Werror=implicit-function-declaration]
>>    rcutree_report_cpu_dead();
>>    ^~~~~~~~~~~~~~~~~~~~~~~
>>    rcutree_prepare_cpu
> The offending backport was dropped before 6.6.144 was released, so the
> build failure itself is gone.
>
> That still leaves 6.6.y and 6.1.y without 9f3f3bdc6d9d ("MIPS: smp:
> report dying CPU to RCU in stop_this_cpu()") while both trees already
> ship 91840be8f710 ("irq_work: Fix use-after-free in irq_work_single()
> on PREEMPT_RT"), which is what exposes the MIPS reboot hang that
> 9f3f3bdc6d9d fixes.
>
> Jonas, could you send backports of 9f3f3bdc6d9d for 6.6.y and 6.1.y
> with that adaptation? I'd rather take the author's version than adapt
> it here.
>

Sure, I adopted it accordingly and sent patches for 6.6.y and 6.1.y.

Best regards,
Jonas