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

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Date:   Tue, 11 Jun 2019 18:46:56 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, 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



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

> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>   arch/powerpc/kernel/head_32.S | 1 +
>   1 file changed, 1 insertion(+)
> 
> 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 */
>