Re: [PATCH 06/12] openrisc: Use of_get_cpu_hwid()

From: Stafford Horne <shorne@gmail.com>
To: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>,
	James Morse <james.morse@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
	Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
	openrisc@lists.librecores.org, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: Re: [PATCH 06/12] openrisc: Use of_get_cpu_hwid()
Date: Thu, 7 Oct 2021 05:44:00 +0900	[thread overview]
Message-ID: <YV4KkAC2p9D4yCnH@antec> (raw)
In-Reply-To: <20211006164332.1981454-7-robh@kernel.org>

On Wed, Oct 06, 2021 at 11:43:26AM -0500, Rob Herring wrote:
> Replace open coded parsing of CPU nodes' 'reg' property with
> of_get_cpu_hwid().
> 
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
> Cc: Stafford Horne <shorne@gmail.com>
> Cc: openrisc@lists.librecores.org
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  arch/openrisc/kernel/smp.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c
> index 415e209732a3..7d5a4f303a5a 100644
> --- a/arch/openrisc/kernel/smp.c
> +++ b/arch/openrisc/kernel/smp.c
> @@ -65,11 +65,7 @@ void __init smp_init_cpus(void)
>  	u32 cpu_id;
>  
>  	for_each_of_cpu_node(cpu) {
> -		if (of_property_read_u32(cpu, "reg", &cpu_id)) {
> -			pr_warn("%s missing reg property", cpu->full_name);
> -			continue;
> -		}
> -
> +		cpu_id = of_get_cpu_hwid(cpu);

You have defined of_get_cpu_hwid to return u64, will this create compiler
warnings when since we are storing a u64 into a u32?

It seems only if we make with W=3.

I thought we usually warned on this.  Oh well, for the openrisc bits.

Acked-by: Stafford Horne <shorne@gmail.com>

>  		if (cpu_id < NR_CPUS)
>  			set_cpu_possible(cpu_id, true);
>  	}
> -- 
> 2.30.2
> 