[PATCH 14/17] mm: introduce numa_emulation

Mike Rapoport
2024-07-16T11:16:28Z

From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c

This code will be later reused by arch_numa.

No functional changes.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
arch/x86/Kconfig | 8 --------
arch/x86/include/asm/numa.h | 12 ------------
arch/x86/mm/Makefile | 1 -
arch/x86/mm/numa_internal.h | 11 -----------
include/linux/numa_memblks.h | 17 +++++++++++++++++
mm/Kconfig | 8 ++++++++
mm/Makefile | 1 +
mm/numa_emulation.c | 4 +---
8 files changed, 27 insertions(+), 35 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d8084f37157c..a42735c126fa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1592,14 +1592,6 @@ config X86_64_ACPI_NUMA
help
Enable ACPI SRAT based node topology detection.

-config NUMA_EMU
- bool "NUMA emulation"
- depends on NUMA
- help
- Enable NUMA emulation. A flat machine will be split
- into virtual nodes when booted with "numa=fake=N", where N is the
- number of nodes. This is only useful for debugging.
-
config NODES_SHIFT
int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
range 1 10
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 6e9a50bf03d4..c6e232e3c303 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -67,16 +67,4 @@ static inline void init_gi_nodes(void) { }
void debug_cpumask_set_cpu(unsigned int cpu, int node, bool enable);
#endif

-#ifdef CONFIG_NUMA_EMU
-int numa_emu_cmdline(char *str);
-void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
- unsigned int nr_emu_nids);
-u64 __init numa_emu_dma_end(void);
-#else /* CONFIG_NUMA_EMU */
-static inline int numa_emu_cmdline(char *str)
-{
- return -EINVAL;
-}
-#endif /* CONFIG_NUMA_EMU */
-
#endif /* _ASM_X86_NUMA_H */
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 8d3a00e5c528..690fbf48e853 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -57,7 +57,6 @@ obj-$(CONFIG_MMIOTRACE_TEST) += testmmiotrace.o
obj-$(CONFIG_NUMA) += numa.o numa_$(BITS).o
obj-$(CONFIG_AMD_NUMA) += amdtopology.o
obj-$(CONFIG_ACPI_NUMA) += srat.o
-obj-$(CONFIG_NUMA_EMU) += numa_emulation.o

obj-$(CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) += pkeys.o
obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o
diff --git a/arch/x86/mm/numa_internal.h b/arch/x86/mm/numa_internal.h
index 249e3aaeadce..11e1ff370c10 100644
--- a/arch/x86/mm/numa_internal.h
+++ b/arch/x86/mm/numa_internal.h
@@ -7,15 +7,4 @@

void __init x86_numa_init(void);

-struct numa_meminfo;
-
-#ifdef CONFIG_NUMA_EMU
-void __init numa_emulation(struct numa_meminfo *numa_meminfo,
- int numa_dist_cnt);
-#else
-static inline void numa_emulation(struct numa_meminfo *numa_meminfo,
- int numa_dist_cnt)
-{ }
-#endif
-
#endif /* __X86_MM_NUMA_INTERNAL_H */
diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h
index 968a590535ac..f81f98678074 100644
--- a/include/linux/numa_memblks.h
+++ b/include/linux/numa_memblks.h
@@ -34,6 +34,23 @@ int __init numa_register_meminfo(struct numa_meminfo *mi);
void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
const struct numa_meminfo *mi);

+#ifdef CONFIG_NUMA_EMU
+int numa_emu_cmdline(char *str);
+void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
+ unsigned int nr_emu_nids);
+u64 __init numa_emu_dma_end(void);
+void __init numa_emulation(struct numa_meminfo *numa_meminfo,
+ int numa_dist_cnt);
+#else
+static inline void numa_emulation(struct numa_meminfo *numa_meminfo,
+ int numa_dist_cnt)
+{ }
+static inline int numa_emu_cmdline(char *str)
+{
+ return -EINVAL;
+}
+#endif /* CONFIG_NUMA_EMU */
+
#endif /* CONFIG_NUMA_MEMBLKS */

#endif /* __NUMA_MEMBLKS_H */
diff --git a/mm/Kconfig b/mm/Kconfig
index 15c6efbaa1df..ae58eecdefdc 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1252,6 +1252,14 @@ config EXECMEM
config NUMA_MEMBLKS
bool

+config NUMA_EMU
+ bool "NUMA emulation"
+ depends on NUMA_MEMBLKS
+ help
+ Enable NUMA emulation. A flat machine will be split
+ into virtual nodes when booted with "numa=fake=N", where N is the
+ number of nodes. This is only useful for debugging.
+
source "mm/damon/Kconfig"

endmenu
diff --git a/mm/Makefile b/mm/Makefile
index 17bc4013a2c5..d5b1b30f76e3 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -141,3 +141,4 @@ obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o
obj-$(CONFIG_EXECMEM) += execmem.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o
+obj-$(CONFIG_NUMA_EMU) += numa_emulation.o
diff --git a/mm/numa_emulation.c b/mm/numa_emulation.c
index 33610026b7a3..031fb9961bf7 100644
--- a/mm/numa_emulation.c
+++ b/mm/numa_emulation.c
@@ -7,9 +7,7 @@
#include <linux/topology.h>
#include <linux/memblock.h>
#include <linux/numa_memblks.h>
-#include <asm/dma.h>
-
-#include "numa_internal.h"
+#include <asm/numa.h>

#define FAKE_NODE_MIN_SIZE ((u64)32 << 20)
#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
--
2.43.0