Re: [RFC/RFT PATCH v2 2/5] arm64, numa: Change the numa init function name to be generic

Atish Patra
2020-09-14T19:33:13Z

On Mon, Sep 14, 2020 at 7:32 AM Jonathan Cameron
<Jonathan.Cameron@huawei.com> wrote:
>
> On Fri, 11 Sep 2020 18:34:38 -0700
> Atish Patra <atish.patra@wdc.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@wdc.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