linux-kernel - Re: [PATCH 06/12] openrisc: Use of_get_cpu

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Date:   Wed, 6 Oct 2021 16:08:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stafford Horne <shorne@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, X86 ML <x86@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-csky@...r.kernel.org,
        Openrisc <openrisc@...ts.librecores.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        SH-Linux <linux-sh@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 06/12] openrisc: Use of_get_cpu_hwid()

On Wed, Oct 6, 2021 at 3:44 PM Stafford Horne <shorne@...il.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@...thpole.se>
> > Cc: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
> > Cc: Stafford Horne <shorne@...il.com>
> > Cc: openrisc@...ts.librecores.org
> > Signed-off-by: Rob Herring <robh@...nel.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@...il.com>
>
> >               if (cpu_id < NR_CPUS)
> >                       set_cpu_possible(cpu_id, true);
> >       }
> > --
> > 2.30.2
> >