Re: [PATCH 02/10] x86: Change size of node ids from u8 to u16 V2

[Eric Dumazet <dada1@cosmosbay.com>]

travis@sgi.com a ecrit :
> Change the size of node ids from 8 bits to 16 bits to
> accomodate more than 256 nodes.
> 
> Signed-off-by: Mike Travis <travis@sgi.com>
> Reviewed-by: Christoph Lameter <clameter@sgi.com>
> ---
> V1->V2:
>     - changed pxm_to_node_map to u16
>     - changed memnode map entries to u16
> ---
>  arch/x86/mm/numa_64.c       |    9 ++++++---
>  arch/x86/mm/srat_64.c       |    2 +-
>  drivers/acpi/numa.c         |    2 +-
>  include/asm-x86/mmzone_64.h |    4 ++--
>  include/asm-x86/numa_64.h   |    4 ++--
>  include/asm-x86/topology.h  |    2 +-
>  6 files changed, 13 insertions(+), 10 deletions(-)
> 
> --- a/arch/x86/mm/numa_64.c
> +++ b/arch/x86/mm/numa_64.c
> @@ -11,6 +11,7 @@
>  #include <linux/ctype.h>
>  #include <linux/module.h>
>  #include <linux/nodemask.h>
> +#include <linux/sched.h>
>  
>  #include <asm/e820.h>
>  #include <asm/proto.h>
> @@ -30,12 +31,12 @@ bootmem_data_t plat_node_bdata[MAX_NUMNO
>  
>  struct memnode memnode;
>  
> -int cpu_to_node_map[NR_CPUS] __read_mostly = {
> +u16 cpu_to_node_map[NR_CPUS] __read_mostly = {
>  	[0 ... NR_CPUS-1] = NUMA_NO_NODE
>  };
>  EXPORT_SYMBOL(cpu_to_node_map);
>  
> -unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
> +u16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
>  	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
>  };
>  
> @@ -544,7 +545,9 @@ void __init numa_initmem_init(unsigned l
>  	node_set(0, node_possible_map);
>  	for (i = 0; i < NR_CPUS; i++)
>  		numa_set_node(i, 0);
> -	node_to_cpumask_map[0] = cpumask_of_cpu(0);
> +	/* we can't use cpumask_of_cpu() yet */
> +	memset(&node_to_cpumask_map[0], 0, sizeof(node_to_cpumask_map[0]));
> +	cpu_set(0, node_to_cpumask_map[0]);
>  	e820_register_active_regions(0, start_pfn, end_pfn);
>  	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
>  }
> --- a/arch/x86/mm/srat_64.c
> +++ b/arch/x86/mm/srat_64.c
> @@ -395,7 +395,7 @@ int __init acpi_scan_nodes(unsigned long
>  static int fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {
>  	[0 ... MAX_NUMNODES-1] = PXM_INVAL
>  };
> -static unsigned char fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
> +static u16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
>  	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
>  };
>  static int __init find_node_by_addr(unsigned long addr)
> --- a/drivers/acpi/numa.c
> +++ b/drivers/acpi/numa.c
> @@ -38,7 +38,7 @@ ACPI_MODULE_NAME("numa");
>  static nodemask_t nodes_found_map = NODE_MASK_NONE;
>  
>  /* maps to convert between proximity domain and logical node ID */
> -static int pxm_to_node_map[MAX_PXM_DOMAINS]
> +static u16 pxm_to_node_map[MAX_PXM_DOMAINS]
>  				= { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
>  static int node_to_pxm_map[MAX_NUMNODES]
>  				= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
> --- a/include/asm-x86/mmzone_64.h
> +++ b/include/asm-x86/mmzone_64.h
> @@ -15,8 +15,8 @@
>  struct memnode {
>  	int shift;
>  	unsigned int mapsize;
> -	u8 *map;
> -	u8 embedded_map[64-16];
> +	u16 *map;
> +	u16 embedded_map[64-16];

Must change to 32-8 here, or 64-8 and change the comment (total size = 128 
bytes). If you change to 32-8, check how .map is set to embedded_map.

>  } ____cacheline_aligned; /* total size = 64 bytes */
>  extern struct memnode memnode;
>  #define memnode_shift memnode.shift
> --- a/include/asm-x86/numa_64.h
> +++ b/include/asm-x86/numa_64.h
> @@ -20,7 +20,7 @@ extern void numa_set_node(int cpu, int n
>  extern void srat_reserve_add_area(int nodeid);
>  extern int hotadd_percent;
>  
> -extern unsigned char apicid_to_node[MAX_LOCAL_APIC];
> +extern u16 apicid_to_node[MAX_LOCAL_APIC];
>  
>  extern void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
>  extern unsigned long numa_free_all_bootmem(void);
> @@ -40,6 +40,6 @@ static inline void clear_node_cpumask(in
>  #define clear_node_cpumask(cpu) do {} while (0)
>  #endif
>  
> -#define NUMA_NO_NODE 0xff
> +#define NUMA_NO_NODE 0xffff
>  
>  #endif
> --- a/include/asm-x86/topology.h
> +++ b/include/asm-x86/topology.h
> @@ -30,7 +30,7 @@
>  #include <asm/mpspec.h>
>  
>  /* Mappings between logical cpu number and node number */
> -extern int cpu_to_node_map[];
> +extern u16 cpu_to_node_map[];
>  extern cpumask_t node_to_cpumask_map[];
>  
>  /* Returns the number of the node containing CPU 'cpu' */
> 

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