linux-kernel - Re: [PATCH] powerpc/32s: Fix another build failure with CONFIG_PPC_KUAP

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Date:   Fri, 29 May 2020 20:53:45 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32s: Fix another build failure with
 CONFIG_PPC_KUAP_DEBUG



Le 29/05/2020 à 20:50, Christophe Leroy a écrit :
> From: Christophe Leroy <christophe.leroy@....fr>
> 
> 'thread' doesn't exist in kuap_check() macro.
> 
> Use 'current' instead.
> 
> Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Argh, can you drop this line ?

> Cc: stable@...r.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>

Reported-by: kbuild test robot <lkp@...el.com>

> ---
>   arch/powerpc/include/asm/book3s/32/kup.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
> index db0a1c281587..668508c8a1b5 100644
> --- a/arch/powerpc/include/asm/book3s/32/kup.h
> +++ b/arch/powerpc/include/asm/book3s/32/kup.h
> @@ -75,7 +75,7 @@
>   
>   .macro kuap_check	current, gpr
>   #ifdef CONFIG_PPC_KUAP_DEBUG
> -	lwz	\gpr, KUAP(thread)
> +	lwz	\gpr, THREAD + KUAP(\current)
>   999:	twnei	\gpr, 0
>   	EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
>   #endif
>