linux-kernel - Re: [PATCH] powerpc/lib/sstep: fix 'ptesync' build error

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Message-ID: <7fbbb7b3-9a57-c50b-937b-7c4efeeb158e@csgroup.eu>
Date:   Thu, 10 Feb 2022 17:40:15 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Anders Roxell <anders.roxell@...aro.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>
CC:     Arnd Bergmann <arnd@...db.de>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] powerpc/lib/sstep: fix 'ptesync' build error



Le 10/02/2022 à 13:44, Anders Roxell a écrit :
> Building tinyconfig with gcc (Debian 11.2.0-16) and assembler (Debian
> 2.37.90.20220207) the following build error shows up:
> 
> {standard input}: Assembler messages:
> {standard input}:2088: Error: unrecognized opcode: `ptesync'
> make[3]: *** [/builds/linux/scripts/Makefile.build:287: arch/powerpc/lib/sstep.o] Error 1
> 
> Re-add the ifdef __powerpc64__ around the 'ptesync' in function
> 'emulate_update_regs()' to like it is in 'analyse_instr()'. Since it looks like
> it got dropped inadvertently by commit 3cdfcbfd32b9 ("powerpc: Change
> analyse_instr so it doesn't modify *regs").
> 
> Cc: stable@...r.kernel.org # v4.14+
> Fixes: 3cdfcbfd32b9 ("powerpc: Change analyse_instr so it doesn't modify *regs")
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>   arch/powerpc/lib/sstep.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
> index a94b0cd0bdc5..d23772f91a36 100644
> --- a/arch/powerpc/lib/sstep.c
> +++ b/arch/powerpc/lib/sstep.c
> @@ -3264,12 +3264,14 @@ void emulate_update_regs(struct pt_regs *regs, struct instruction_op *op)
>   		case BARRIER_EIEIO:
>   			eieio();
>   			break;
> +#ifdef __powerpc64__

Should be CONFIG_PPC64 instead of __powerpc64__


>   		case BARRIER_LWSYNC:
>   			asm volatile("lwsync" : : : "memory");
>   			break;
>   		case BARRIER_PTESYNC:
>   			asm volatile("ptesync" : : : "memory");
>   			break;
> +#endif
>   		}
>   		break;
>