[PATCH v2 2/3] powerpc/numa: Allow cpu_to_coregroup_id without PPC_SPLPAR
From: Srikar Dronamraju <hidden>
Date: 2026-06-05 05:54:12
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Make cpu_to_coregroup_id() available outside PPC_SPLPAR so it can be used by platforms that do not rely on the SPLPAR-specific VPHN path. Keep the existing fallback behavior by returning the core ID when coregroup information is unavailable. Signed-off-by: Srikar Dronamraju <redacted> --- Changelog from v1: - Handle comments from Christophe Leroy; Remove extern key word in declaration arch/powerpc/include/asm/topology.h | 15 +++++++-------- arch/powerpc/mm/numa.c | 22 ++++++++++++++++------ 2 files changed, 23 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 66ed5fe1b718..385715f1ad56 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h@@ -71,6 +71,7 @@ extern void map_cpu_to_node(int cpu, int node); extern void unmap_cpu_from_node(unsigned long cpu); #endif /* CONFIG_HOTPLUG_CPU */ +int cpu_to_coregroup_id(int cpu); #else static inline int early_cpu_to_node(int cpu) { return 0; }
@@ -107,14 +108,6 @@ static inline void map_cpu_to_node(int cpu, int node) {} static inline void unmap_cpu_from_node(unsigned long cpu) {} #endif /* CONFIG_HOTPLUG_CPU */ #endif /* CONFIG_SMP */ - -#endif /* CONFIG_NUMA */ - -#if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR) -void find_and_update_cpu_nid(int cpu); -extern int cpu_to_coregroup_id(int cpu); -#else -static inline void find_and_update_cpu_nid(int cpu) {} static inline int cpu_to_coregroup_id(int cpu) { #ifdef CONFIG_SMP
@@ -124,6 +117,12 @@ static inline int cpu_to_coregroup_id(int cpu) #endif } +#endif /* CONFIG_NUMA */ + +#if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR) +void find_and_update_cpu_nid(int cpu); +#else +static inline void find_and_update_cpu_nid(int cpu) {} #endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */ #include <asm-generic/topology.h>
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index c44a80d8fc11..9aa71eb7e96b 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c@@ -1428,6 +1428,21 @@ void find_and_update_cpu_nid(int cpu) pr_debug("%s:%d cpu %d nid %d\n", __func__, __LINE__, cpu, new_nid); } +static int topology_update_init(void) +{ + topology_inited = 1; + return 0; +} +device_initcall(topology_update_init); + +#else +static long vphn_get_associativity(unsigned long cpu, + __be32 *associativity) +{ + return -1; +} +#endif /* CONFIG_PPC_SPLPAR */ + int cpu_to_coregroup_id(int cpu) { __be32 associativity[VPHN_ASSOC_BUFSIZE] = {0};
@@ -1453,10 +1468,5 @@ int cpu_to_coregroup_id(int cpu) return cpu_to_core_id(cpu); } -static int topology_update_init(void) -{ - topology_inited = 1; - return 0; + return coregroup_id; } -device_initcall(topology_update_init); -#endif /* CONFIG_PPC_SPLPAR */
--
2.43.0