Re: [REGRESSION] Power9 pseries boot hang in v7.2-rc6, narrowed to PowerPC GENERIC_ENTRY conversion window

[Venkat Rao Bagalkote <venkat88@linux.ibm.com>]

Hello Mukesh,


On 11/08/26 6:16 pm, Mukesh Kumar Chaurasiya wrote:
> On Tue, Aug 11, 2026 at 11:37:45AM +0530, Mukesh Kumar Chaurasiya wrote:
>> On Mon, Aug 10, 2026 at 05:19:27PM +0530, Venkat Rao Bagalkote wrote:
>>> Hi Shrikanth,
>>>
>>>
>>> On 04/08/26 8:23 pm, Shrikanth Hegde wrote:
>>>> Hi Venkat.
>>>>
>>>> On 8/4/26 2:04 PM, Venkat Rao Bagalkote wrote:
>>>>> Hi,
>>>>>
>>>>> I'm seeing a boot regression on a Power9 pseries LPAR. The system
>>>>> hangs very early during boot after:
>>>>>
>>>>> Quiescing Open Firmware ...
>>>>> Booting Linux via __start() ...
>>>>>
>>>> That is strange. not sure where to look at without any logs.
>>>> Is it a specific config that fails or this specific LPAR that fails?
>>>>
>> Is this a specific lpar or all power9 pseries are exhibiting same
>> behaviour?
Its specific to a lpar.
>>
>> Regards,
>> Mukesh
>> [...]
>>
> Hey Venkat,
>
> Can you try the below fix?
>
> diff --git a/arch/powerpc/include/asm/entry-common.h b/arch/powerpc/include/asm/entry-common.h
> index c5adb5006361..de64389b0815 100644
> --- a/arch/powerpc/include/asm/entry-common.h
> +++ b/arch/powerpc/include/asm/entry-common.h
> @@ -270,7 +270,7 @@ static inline void arch_interrupt_exit_prepare(struct pt_regs *regs)
>   	}
>   
>   	/* irqentry_exit expects to be called with interrupts disabled */
> -	local_irq_disable();
> +	hard_irq_disable();
>   }
>   
>   static inline void arch_interrupt_async_enter_prepare(struct pt_regs *regs)
>

I tired this fix, but issue still persists.


Regards,

Venkat.