linux-kernel - Re: [PATCH] powerpc/cputable: Add missing PPC_FEATURE

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Message-ID: <5de5628e-89db-4b90-8eb2-2f8189ed9223@csgroup.eu>
Date: Mon, 12 Feb 2024 13:24:42 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: David Engraf <david.engraf@...go.com>, "mpe@...erman.id.au"
	<mpe@...erman.id.au>, "npiggin@...il.com" <npiggin@...il.com>,
	"aneesh.kumar@...nel.org" <aneesh.kumar@...nel.org>,
	"naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>
CC: "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/cputable: Add missing PPC_FEATURE_BOOKE on PPC64
 Book-E



Le 07/02/2024 à 10:27, David Engraf a écrit :
> [Vous ne recevez pas souvent de courriers de david.engraf@...go.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> Commit e320a76db4b0 ("powerpc/cputable: Split cpu_specs[] out of cputable.h")
> moved the cpu_specs to separate header files. Previously PPC_FEATURE_BOOKE
> was enabled by CONFIG_PPC_BOOK3E_64. The definition in cpu_specs_e500mc.h
> for PPC64 no longer enables PPC_FEATURE_BOOKE.
> 
> This breaks user space reading the ELF hwcaps and expect PPC_FEATURE_BOOKE.
> Debugging an application with gdb is no longer working on e5500/e6500
> because the 64-bit detection relies on PPC_FEATURE_BOOKE for Book-E.
> 
> Fixes: e320a76db4b0 ("powerpc/cputable: Split cpu_specs[] out of cputable.h")
> Signed-off-by: David Engraf <david.engraf@...go.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   arch/powerpc/kernel/cpu_specs_e500mc.h | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/cpu_specs_e500mc.h b/arch/powerpc/kernel/cpu_specs_e500mc.h
> index ceb06b109f831..2ae8e9a7b461c 100644
> --- a/arch/powerpc/kernel/cpu_specs_e500mc.h
> +++ b/arch/powerpc/kernel/cpu_specs_e500mc.h
> @@ -8,7 +8,8 @@
> 
>   #ifdef CONFIG_PPC64
>   #define COMMON_USER_BOOKE      (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \
> -                                PPC_FEATURE_HAS_FPU | PPC_FEATURE_64)
> +                                PPC_FEATURE_HAS_FPU | PPC_FEATURE_64 | \
> +                                PPC_FEATURE_BOOKE)
>   #else
>   #define COMMON_USER_BOOKE      (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \
>                                   PPC_FEATURE_BOOKE)
> --
> 2.40.1
>