linux-kernel - Re: [PATCH 1/2] mips/kgdb: prepare arch_kgdb

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Message-ID: <20181206140902.ea6jlwqrbcwyxp5r@holly.lan>
Date:   Thu, 6 Dec 2018 14:09:02 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Richard Kuo <rkuo@...eaurora.org>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Ley Foon Tan <lftan@...era.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Jason Wessel <jason.wessel@...driver.com>,
        Douglas Anderson <dianders@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-hexagon@...r.kernel.org, linux-mips@...r.kernel.org,
        nios2-dev@...ts.rocketboards.org, linuxppc-dev@...ts.ozlabs.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        kgdb-bugreport@...ts.sourceforge.net
Subject: Re: [PATCH 1/2] mips/kgdb: prepare arch_kgdb_ops for constness

On Wed, Dec 05, 2018 at 04:41:09AM +0000, Christophe Leroy wrote:
> MIPS is the only architecture modifying arch_kgdb_ops during init.
> This patch makes the init static, so that it can be changed to
> const in following patch, as recommended by checkpatch.pl
> 
> Suggested-by: Paul Burton <paul.burton@...s.com>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

>From my side this is
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>

Since this is a dependency for the next patch I'd be happy to take via
my tree... but would need an ack from the MIPS guys to do that.


Daniel.

> ---
>  arch/mips/kernel/kgdb.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
> index eb6c0d582626..31eff1bec577 100644
> --- a/arch/mips/kernel/kgdb.c
> +++ b/arch/mips/kernel/kgdb.c
> @@ -394,18 +394,16 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
>  	return -1;
>  }
>  
> -struct kgdb_arch arch_kgdb_ops;
> +struct kgdb_arch arch_kgdb_ops = {
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> +	.gdb_bpt_instr = { spec_op << 2, 0x00, 0x00, break_op },
> +#else
> +	.gdb_bpt_instr = { break_op, 0x00, 0x00, spec_op << 2 },
> +#endif
> +};
>  
>  int kgdb_arch_init(void)
>  {
> -	union mips_instruction insn = {
> -		.r_format = {
> -			.opcode = spec_op,
> -			.func	= break_op,
> -		}
> -	};
> -	memcpy(arch_kgdb_ops.gdb_bpt_instr, insn.byte, BREAK_INSTR_SIZE);
> -
>  	register_die_notifier(&kgdb_notifier);
>  
>  	return 0;
> -- 
> 2.13.3
>