Ping: [PATCH v2] NUMA: no need for asm/numa.h when !NUMA

[Jan Beulich <jbeulich@xxxxxxxx>]

On 08.01.2024 12:30, Jan Beulich wrote:
> There's no point in every architecture carrying the same stubs for the
> case when NUMA isn't enabled (or even supported). Move all of that to
> xen/numa.h; replace explicit uses of asm/numa.h in common code. Make
> inclusion of asm/numa.h dependent upon NUMA=y.
> 
> Drop the no longer applicable "implement NUMA support" comments - in a
> !NUMA section this simply makes no sense.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

May I please ask for an Arm ack (or otherwise) here?

Thanks, Jan

> --- a/xen/arch/arm/include/asm/numa.h
> +++ /dev/null
> @@ -1,31 +0,0 @@
> -#ifndef __ARCH_ARM_NUMA_H
> -#define __ARCH_ARM_NUMA_H
> -
> -#include <xen/mm.h>
> -
> -typedef u8 nodeid_t;
> -
> -#ifndef CONFIG_NUMA
> -
> -/* Fake one node for now. See also node_online_map. */
> -#define cpu_to_node(cpu) 0
> -#define node_to_cpumask(node)   (cpu_online_map)
> -
> -/* XXX: implement NUMA support */
> -#define node_spanned_pages(nid) (max_page - mfn_x(first_valid_mfn))
> -#define node_start_pfn(nid) (mfn_x(first_valid_mfn))
> -#define __node_distance(a, b) (20)
> -
> -#endif
> -
> -#define arch_want_default_dmazone() (false)
> -
> -#endif /* __ARCH_ARM_NUMA_H */
> -/*
> - * Local variables:
> - * mode: C
> - * c-file-style: "BSD"
> - * c-basic-offset: 4
> - * indent-tabs-mode: nil
> - * End:
> - */
> --- a/xen/arch/arm/smpboot.c
> +++ b/xen/arch/arm/smpboot.c
> @@ -42,7 +42,7 @@ integer_param("maxcpus", max_cpus);
>  /* CPU logical map: map xen cpuid to an MPIDR */
>  register_t __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID 
> };
>  
> -/* Fake one node for now. See also asm/numa.h */
> +/* Fake one node for now. See also xen/numa.h */
>  nodemask_t __read_mostly node_online_map = { { [0] = 1UL } };
>  
>  /* Xen stack for bringing up the first CPU. */
> --- a/xen/arch/ppc/include/asm/numa.h
> +++ /dev/null
> @@ -1,20 +0,0 @@
> -#ifndef __ASM_PPC_NUMA_H__
> -#define __ASM_PPC_NUMA_H__
> -
> -#include <xen/types.h>
> -#include <xen/mm.h>
> -
> -typedef uint8_t nodeid_t;
> -
> -/* Fake one node for now. See also node_online_map. */
> -#define cpu_to_node(cpu) 0
> -#define node_to_cpumask(node)   (cpu_online_map)
> -
> -/* XXX: implement NUMA support */
> -#define node_spanned_pages(nid) (max_page - mfn_x(first_valid_mfn))
> -#define node_start_pfn(nid) (mfn_x(first_valid_mfn))
> -#define __node_distance(a, b) (20)
> -
> -#define arch_want_default_dmazone() (false)
> -
> -#endif /* __ASM_PPC_NUMA_H__ */
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -138,7 +138,6 @@
>  #include <xen/spinlock.h>
>  
>  #include <asm/flushtlb.h>
> -#include <asm/numa.h>
>  #include <asm/page.h>
>  
>  #include <public/sysctl.h>
> --- a/xen/common/sysctl.c
> +++ b/xen/common/sysctl.c
> @@ -22,8 +22,8 @@
>  #include <asm/current.h>
>  #include <xen/hypercall.h>
>  #include <public/sysctl.h>
> -#include <asm/numa.h>
>  #include <xen/nodemask.h>
> +#include <xen/numa.h>
>  #include <xsm/xsm.h>
>  #include <xen/pmstat.h>
>  #include <xen/livepatch.h>
> --- a/xen/include/xen/domain.h
> +++ b/xen/include/xen/domain.h
> @@ -2,6 +2,7 @@
>  #ifndef __XEN_DOMAIN_H__
>  #define __XEN_DOMAIN_H__
>  
> +#include <xen/numa.h>
>  #include <xen/types.h>
>  
>  #include <public/xen.h>
> @@ -12,7 +13,6 @@ struct guest_area {
>  };
>  
>  #include <asm/domain.h>
> -#include <asm/numa.h>
>  
>  typedef union {
>      struct vcpu_guest_context *nat;
> --- a/xen/include/xen/numa.h
> +++ b/xen/include/xen/numa.h
> @@ -2,7 +2,13 @@
>  #define _XEN_NUMA_H
>  
>  #include <xen/mm-frame.h>
> +
> +#ifdef CONFIG_NUMA
> +#include <xen/pdx.h>
>  #include <asm/numa.h>
> +#else
> +typedef uint8_t nodeid_t;
> +#endif
>  
>  #define NUMA_NO_NODE     0xFF
>  #define NUMA_NO_DISTANCE 0xFF
> @@ -108,8 +114,18 @@ extern void numa_set_processor_nodes_par
>  
>  #else
>  
> +/* Fake one node for now. See also node_online_map. */
> +#define cpu_to_node(cpu) 0
> +#define node_to_cpumask(node)   cpu_online_map
> +
> +#define arch_want_default_dmazone() false
> +
>  extern mfn_t first_valid_mfn;
>  
> +#define node_spanned_pages(nid) (max_page - mfn_x(first_valid_mfn))
> +#define node_start_pfn(nid) mfn_x(first_valid_mfn)
> +#define __node_distance(a, b) 20
> +
>  static inline nodeid_t mfn_to_nid(mfn_t mfn)
>  {
>      return 0;
> --- a/xen/include/xen/pci.h
> +++ b/xen/include/xen/pci.h
> @@ -11,10 +11,10 @@
>  #include <xen/list.h>
>  #include <xen/spinlock.h>
>  #include <xen/irq.h>
> +#include <xen/numa.h>
>  #include <xen/pci_regs.h>
>  #include <xen/pfn.h>
>  #include <asm/device.h>
> -#include <asm/numa.h>
>  
>  /*
>   * The PCI interface treats multi-function devices as independent