[PATCH] powerpc/32s: fix initial setup of segment registers on secondary CPU

[Christophe Leroy]

Le 18/06/2019 à 14:31, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy at c-s.fr> writes:
>> Le 11/06/2019 à 17:47, Christophe Leroy a écrit :
>>> The patch referenced below moved the loading of segment registers
>>> out of load_up_mmu() in order to do it earlier in the boot sequence.
>>> However, the secondary CPU still needs it to be done when loading up
>>> the MMU.
>>>
>>> Reported-by: Erhard F. <erhard_f at mailbox.org>
>>> Fixes: 215b823707ce ("powerpc/32s: set up an early static hash table for KASAN")
>>
>> Cc: stable at vger.kernel.org
> 
> Sorry patchwork didn't pick that up and I missed it. The AUTOSEL bot
> will probably pick it up anyway though.

Don't worry, this was unneeded because we added KASAN in 5.2.
My mistake.
Christophe

> 
> cheers
> 
>>> diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
>>> index 1d5f1bd0dacd..f255e22184b4 100644
>>> --- a/arch/powerpc/kernel/head_32.S
>>> +++ b/arch/powerpc/kernel/head_32.S
>>> @@ -752,6 +752,7 @@ __secondary_start:
>>>    	stw	r0,0(r3)
>>>    
>>>    	/* load up the MMU */
>>> +	bl	load_segment_registers
>>>    	bl	load_up_mmu
>>>    
>>>    	/* ptr to phys current thread */
>>>