Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20211006164332.1981454-1-robh@kernel.org> <20211006164332.1981454-7-robh@kernel.org>
 <YV4KkAC2p9D4yCnH@antec>
In-Reply-To: <YV4KkAC2p9D4yCnH@antec>
From:   Rob Herring <robh@kernel.org>
Date:   Wed, 6 Oct 2021 16:08:38 -0500
Message-ID: <CAL_JsqLv+Ym=hxxz2vm0H3pbx1FRkBpHs3V=8DKjG43n+gS+RA@mail.gmail.com>
Subject: Re: [PATCH 06/12] openrisc: Use of_get_cpu_hwid()
To:     Stafford Horne <shorne@gmail.com>
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 ML <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>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <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 <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        linux-csky@vger.kernel.org,
        Openrisc <openrisc@lists.librecores.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        SH-Linux <linux-sh@vger.kernel.org>, devicetree@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Wed, Oct 6, 2021 at 3:44 PM Stafford Horne <shorne@gmail.com> wrote:
>
> 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);

Oops, that should be: of_get_cpu_hwid(cpu, 0);

I thought I double checked all those...

> 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?

I'm counting on the caller to know the max size for their platform.

>
> It seems only if we make with W=3.
>
> I thought we usually warned on this.  Oh well, for the openrisc bits.

That's only on ptr truncation I think.

> Acked-by: Stafford Horne <shorne@gmail.com>
>
> >               if (cpu_id < NR_CPUS)
> >                       set_cpu_possible(cpu_id, true);
> >       }
> > --
> > 2.30.2
> >