Date:   Mon, 14 Sep 2020 12:32:41 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Atish Patra <atish.patra@....com>,
        David Hildenbrand <david@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Zong Li <zong.li@...ive.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Will Deacon <will@...nel.org>, linux-arch@...r.kernel.org,
        Jia He <justin.he@....com>, Anup Patel <anup@...infault.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Steven Price <steven.price@....com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: Re: [RFC/RFT PATCH v2 2/5] arm64, numa: Change the numa init function
 name to be generic

On Mon, Sep 14, 2020 at 7:32 AM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> On Fri, 11 Sep 2020 18:34:38 -0700
> Atish Patra <atish.patra@....com> wrote:
>
> > As we are using generic numa implementation code, modify the init function
> > name to indicate that generic implementation.
> >
> > Signed-off-by: Atish Patra <atish.patra@....com>
>
> A few comments inline but more about which layer we do the build protections
> at than anything important.
>
> Thanks,
>
> Jonathan
>
> > ---
> >  arch/arm64/kernel/acpi_numa.c | 13 -------------
> >  arch/arm64/mm/init.c          |  4 ++--
> >  drivers/base/arch_numa.c      | 29 ++++++++++++++++++++++++++---
> >  include/asm-generic/numa.h    |  4 ++--
> >  4 files changed, 30 insertions(+), 20 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c
> > index 7ff800045434..96502ff92af5 100644
> > --- a/arch/arm64/kernel/acpi_numa.c
> > +++ b/arch/arm64/kernel/acpi_numa.c
> > @@ -117,16 +117,3 @@ void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
> >
> >       node_set(node, numa_nodes_parsed);
> >  }
> > -
> > -int __init arm64_acpi_numa_init(void)
> > -{
> > -     int ret;
> > -
> > -     ret = acpi_numa_init();
> > -     if (ret) {
> > -             pr_info("Failed to initialise from firmware\n");
> > -             return ret;
> > -     }
> > -
> > -     return srat_disabled() ? -EINVAL : 0;
> > -}
> > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> > index 481d22c32a2e..93b660229e1d 100644
> > --- a/arch/arm64/mm/init.c
> > +++ b/arch/arm64/mm/init.c
> > @@ -418,10 +418,10 @@ void __init bootmem_init(void)
> >       max_pfn = max_low_pfn = max;
> >       min_low_pfn = min;
> >
> > -     arm64_numa_init();
> > +     arch_numa_init();
> >
> >       /*
> > -      * must be done after arm64_numa_init() which calls numa_init() to
> > +      * must be done after arch_numa_init() which calls numa_init() to
> >        * initialize node_online_map that gets used in hugetlb_cma_reserve()
> >        * while allocating required CMA size across online nodes.
> >        */
> > diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
> > index 73f8b49d485c..a4039dcabd3e 100644
> > --- a/drivers/base/arch_numa.c
> > +++ b/drivers/base/arch_numa.c
> > @@ -13,7 +13,9 @@
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> >
> > +#ifdef CONFIG_ACPI_NUMA
> >  #include <asm/acpi.h>
> > +#endif
>
> Could include linux/acpi.h which I think gets you everything you need in here
> and has protections against building for non ACPI cases.
>

Sure. will do that.

> >  #include <asm/sections.h>
> >
> >  struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
> > @@ -444,16 +446,37 @@ static int __init dummy_numa_init(void)
> >       return 0;
> >  }
> >
> > +#ifdef CONFIG_ACPI_NUMA
> > +int __init arch_acpi_numa_init(void)
> > +{
> > +     int ret;
> > +
> > +     ret = acpi_numa_init();
>
> I wonder if this is the correct level at which to stub this out
> as opposed to providing a stub for acpi_numa_init()
> and srat_disabled()
>

I guess you mean adding a stub in acpi.h and acpi_numa.h ?
As it would touch x86 related code as well, I think it is better to do
it as a followup
series when we try to unify x86 numa code as well (at least some part of it) ?

> At this stage I'm not sure I care too strongly though.
>
> > +     if (ret) {
> > +             pr_info("Failed to initialise from firmware\n");
> > +             return ret;
> > +     }
> > +
> > +     return srat_disabled() ? -EINVAL : 0;
> > +}
> > +#else
> > +int __init arch_acpi_numa_init(void)
> > +{
> > +     return -EOPNOTSUPP;
> > +}
> > +
> > +#endif
> > +
> >  /**
> > - * arm64_numa_init() - Initialize NUMA
> > + * arch_numa_init() - Initialize NUMA
> >   *
> >   * Try each configured NUMA initialization method until one succeeds. The
> >   * last fallback is dummy single node config encomapssing whole memory.
> >   */
> > -void __init arm64_numa_init(void)
> > +void __init arch_numa_init(void)
> >  {
> >       if (!numa_off) {
> > -             if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
> > +             if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
> >                       return;
> >               if (acpi_disabled && !numa_init(of_numa_init))
> >                       return;
> > diff --git a/include/asm-generic/numa.h b/include/asm-generic/numa.h
> > index 2718d5a6ff03..e7962db4ba44 100644
> > --- a/include/asm-generic/numa.h
> > +++ b/include/asm-generic/numa.h
> > @@ -27,7 +27,7 @@ static inline const struct cpumask *cpumask_of_node(int node)
> >  }
> >  #endif
> >
> > -void __init arm64_numa_init(void);
> > +void __init arch_numa_init(void);
> >  int __init numa_add_memblk(int nodeid, u64 start, u64 end);
> >  void __init numa_set_distance(int from, int to, int distance);
> >  void __init numa_free_distance(void);
> > @@ -41,7 +41,7 @@ void numa_remove_cpu(unsigned int cpu);
> >  static inline void numa_store_cpu_info(unsigned int cpu) { }
> >  static inline void numa_add_cpu(unsigned int cpu) { }
> >  static inline void numa_remove_cpu(unsigned int cpu) { }
> > -static inline void arm64_numa_init(void) { }
> > +static inline void arch_numa_init(void) { }
> >  static inline void early_map_cpu_to_node(unsigned int cpu, int nid) { }
> >
> >  #endif       /* CONFIG_NUMA */
>
>
>
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-- 
Regards,
Atish

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