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

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Date:   Tue, 18 Jun 2019 22:31:26 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, erhard_f@...lbox.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32s: fix initial setup of segment registers on secondary CPU

Christophe Leroy <christophe.leroy@....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@...lbox.org>
>> Fixes: 215b823707ce ("powerpc/32s: set up an early static hash table for KASAN")
>
> Cc: stable@...r.kernel.org

Sorry patchwork didn't pick that up and I missed it. The AUTOSEL bot
will probably pick it up anyway though.

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 */
>>