Commit 645a7919 authored by Tejun Heo's avatar Tejun Heo Committed by Ingo Molnar
Browse files

x86: Unify CPU -> NUMA node mapping between 32 and 64bit 



Unlike 64bit, 32bit has been using its own cpu_to_node_map[] for
CPU -> NUMA node mapping.  Replace it with early_percpu variable
x86_cpu_to_node_map and share the mapping code with 64bit.

* USE_PERCPU_NUMA_NODE_ID is now enabled for 32bit too.

* x86_cpu_to_node_map and numa_set/clear_node() are moved from
  numa_64 to numa.  For now, on 32bit, x86_cpu_to_node_map is initialized
  with 0 instead of NUMA_NO_NODE.  This is to avoid introducing unexpected
  behavior change and will be updated once init path is unified.

* srat_detect_node() is now enabled for x86_32 too.  It calls
  numa_set_node() and initializes the mapping making explicit
  cpu_to_node_map[] updates from map/unmap_cpu_to_node() unnecessary.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: eric.dumazet@gmail.com
Cc: yinghai@kernel.org
Cc: brgerst@gmail.com
Cc: gorcunov@gmail.com
Cc: penberg@kernel.org
Cc: shaohui.zheng@intel.com
Cc: rientjes@google.com
LKML-Reference: <1295789862-25482-15-git-send-email-tj@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
parent bbc9e2f4

arch/x86/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -1705,7 +1705,7 @@ config HAVE_ARCH_EARLY_PFN_TO_NID 
	depends on NUMA



config USE_PERCPU_NUMA_NODE_ID

	def_bool X86_64

	def_bool y

	depends on NUMA



menu "Power management and ACPI options"

arch/x86/include/asm/numa.h

+8 −0
Original line number Diff line number Diff line
@@ -30,4 +30,12 @@ static inline void set_apicid_to_node(int apicid, s16 node) 
# include "numa_64.h"

#endif



#ifdef CONFIG_NUMA

extern void __cpuinit numa_set_node(int cpu, int node);

extern void __cpuinit numa_clear_node(int cpu);

#else	/* CONFIG_NUMA */

static inline void numa_set_node(int cpu, int node)	{ }

static inline void numa_clear_node(int cpu)		{ }

#endif	/* CONFIG_NUMA */



#endif	/* _ASM_X86_NUMA_H */

arch/x86/include/asm/numa_64.h

+0 −4
Original line number Diff line number Diff line
@@ -30,8 +30,6 @@ extern void setup_node_bootmem(int nodeid, unsigned long start, 


extern void __init init_cpu_to_node(void);

extern int __cpuinit numa_cpu_node(int cpu);

extern void __cpuinit numa_set_node(int cpu, int node);

extern void __cpuinit numa_clear_node(int cpu);

extern void __cpuinit numa_add_cpu(int cpu);

extern void __cpuinit numa_remove_cpu(int cpu);
@@ -43,8 +41,6 @@ void numa_emu_cmdline(char *); 
#else

static inline void init_cpu_to_node(void)		{ }

static inline int numa_cpu_node(int cpu)		{ return NUMA_NO_NODE; }

static inline void numa_set_node(int cpu, int node)	{ }

static inline void numa_clear_node(int cpu)		{ }

static inline void numa_add_cpu(int cpu, int node)	{ }

static inline void numa_remove_cpu(int cpu)		{ }

#endif

arch/x86/include/asm/topology.h

+0 −17
Original line number Diff line number Diff line
@@ -47,21 +47,6 @@ 


#include <asm/mpspec.h>



#ifdef CONFIG_X86_32



/* Mappings between logical cpu number and node number */

extern int cpu_to_node_map[];



/* Returns the number of the node containing CPU 'cpu' */

static inline int __cpu_to_node(int cpu)

{

	return cpu_to_node_map[cpu];

}

#define early_cpu_to_node __cpu_to_node

#define cpu_to_node __cpu_to_node



#else /* CONFIG_X86_64 */



/* Mappings between logical cpu number and node number */

DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
@@ -84,8 +69,6 @@ static inline int early_cpu_to_node(int cpu) 


#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */



#endif /* CONFIG_X86_64 */



/* Mappings between node number and cpus on that node. */

extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];

arch/x86/kernel/acpi/boot.c

+0 −5
Original line number Diff line number Diff line
@@ -590,12 +590,7 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 
	if (nid == -1 || !node_online(nid))

		return;

	set_apicid_to_node(physid, nid);

#ifdef CONFIG_X86_64

	numa_set_node(cpu, nid);

#else /* CONFIG_X86_32 */

	cpu_to_node_map[cpu] = nid;

#endif



#endif

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE