Machine as follows,
[ 0.000000] MIPS: machine is loongson,loongson64c-4core-ls7a
If SMP if off, error as follows:
0x0:
In file included from ./include/linux/gfp.h:9:0,
from ./include/linux/xarray.h:14,
from ./include/linux/radix-tree.h:18,
from ./include/linux/fs.h:15,
from ./include/linux/compat.h:17,
from arch/mips/kernel/asm-offsets.c:12:
./include/linux/topology.h: In function ‘numa_node_id’:
./include/linux/topology.h:119:2: error: implicit declaration of function ‘cpu_logical_map’ [-Werror=implicit-function-declaration]
return cpu_to_node(raw_smp_processor_id());
^
In uniprocessor machines cpu_to_node(cpu) values 0.
arch/mips/include/asm/mach-loongson64/topology.h -> 0x0
And then errors follows,
0x1:
In file included from ./arch/mips/include/asm/mach-loongson64/topology.h:5:0,
from ./arch/mips/include/asm/topology.h:11,
from ./include/linux/topology.h:36,
from ./include/linux/gfp.h:9,
from ./include/linux/xarray.h:14,
from ./include/linux/radix-tree.h:18,
from ./include/linux/fs.h:15,
from ./include/linux/compat.h:17,
from arch/mips/kernel/asm-offsets.c:12:
./arch/mips/include/asm/smp.h:28:44: error: macro "raw_smp_processor_id" passed 1 arguments, but takes just 0
static inline int raw_smp_processor_id(void)
^
./arch/mips/include/asm/smp.h:29:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token
{
^
./arch/mips/include/asm/smp.h:38:0: warning: "raw_smp_processor_id" redefined
#define raw_smp_processor_id raw_smp_processor_id
^
In file included from ./arch/mips/include/asm/cpu-type.h:12:0,
from ./arch/mips/include/asm/timex.h:19,
from ./include/linux/timex.h:65,
from ./include/linux/time32.h:13,
from ./include/linux/time.h:73,
from ./include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
./include/linux/smp.h:160:0: note: this is the location of the previous definition
#define raw_smp_processor_id() 0
^
0x2:
In file included from ./arch/mips/include/asm/mach-loongson64/topology.h:5:0,
from ./arch/mips/include/asm/topology.h:11,
from ./include/linux/topology.h:36,
from ./include/linux/gfp.h:9,
from ./include/linux/xarray.h:14,
from ./include/linux/radix-tree.h:18,
from ./include/linux/fs.h:15,
from ./include/linux/compat.h:17,
from arch/mips/kernel/asm-offsets.c:12:
./arch/mips/include/asm/smp.h:42:29: error: ‘CONFIG_MIPS_NR_CPU_NR_MAP’ undeclared here (not in a function)
extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
^
0x3:
./arch/mips/include/asm/smp.h:69:20: error: redefinition of ‘smp_send_reschedule’
static inline void smp_send_reschedule(int cpu)
^
In file included from ./arch/mips/include/asm/cpu-type.h:12:0,
from ./arch/mips/include/asm/timex.h:19,
from ./include/linux/timex.h:65,
from ./include/linux/time32.h:13,
from ./include/linux/time.h:73,
from ./include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
./include/linux/smp.h:167:20: note: previous definition of ‘smp_send_reschedule’ was here
static inline void smp_send_reschedule(int cpu) { }
^
In file included from ./arch/mips/include/asm/mach-loongson64/topology.h:5:0,
from ./arch/mips/include/asm/topology.h:11,
from ./include/linux/topology.h:36,
from ./include/linux/gfp.h:9,
from ./include/linux/xarray.h:14,
from ./include/linux/radix-tree.h:18,
from ./include/linux/fs.h:15,
from ./include/linux/compat.h:17,
from arch/mips/kernel/asm-offsets.c:12:
./arch/mips/include/asm/smp.h: In function ‘smp_send_reschedule’:
0x4:
./arch/mips/include/asm/smp.h:73:8: error: dereferencing pointer to incomplete type
mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
^
./arch/mips/include/asm/smp.h: In function ‘kexec_nonboot_cpu’:
./arch/mips/include/asm/smp.h:99:15: error: dereferencing pointer to incomplete type
return mp_ops->kexec_nonboot_cpu();
^
./arch/mips/include/asm/smp.h:99:2: warning: ‘return’ with a value, in function returning void
return mp_ops->kexec_nonboot_cpu();
^
./arch/mips/include/asm/smp.h: In function ‘kexec_nonboot_cpu_func’:
./arch/mips/include/asm/smp.h:106:15: error: dereferencing pointer to incomplete type
return mp_ops->kexec_nonboot_cpu;
^
./arch/mips/include/asm/smp.h: In function ‘arch_send_call_function_single_ipi’:
./arch/mips/include/asm/smp.h:128:8: error: dereferencing pointer to incomplete type
mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION);
^
./arch/mips/include/asm/smp.h: In function ‘arch_send_call_function_ipi_mask’:
./arch/mips/include/asm/smp.h:135:8: error: dereferencing pointer to incomplete type
mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
^
For 0x2, CONFIG_MIPS_NR_CPU_NR_MAP can't depend on SMP,
otherwise its ranges not include 1.
arch/mips/Kconfig -> 0x2
For 0x1, 0x3, 0x4 can be fixed by checking CONFIG_SMP,
arch/mips/include/asm/smp.h -> 0x1, 0x3, 0x4
After fix them, errors as follows,
0x5:
mm/percpu.o: In function `setup_per_cpu_areas':
(.init.text+0xa00): multiple definition of `setup_per_cpu_areas'
arch/mips/mm/init.o:(.init.text+0xa8): first defined here
Normally, setup_per_cpu_areas is defined at arch/mips/mm/init.c
with CONFIG_HAVE_SETUP_PER_CPU_AREA. mm/percpu.c defines it with
CONFIG_SMP && !CONFIG_HAVE_SETUP_PER_CPU_AREA || !CONFIG_SMP.
Obviously, !CONFIG_SMP causes the multiple definition.
arch/mips/mm/init.c -> 0x5
New errors as follows,
0x6:
mm/page_alloc.o: In function `get_page_from_freelist':
page_alloc.c:(.text+0x4734): undefined reference to `node_reclaim_distance'
page_alloc.c:(.text+0x473c): undefined reference to `node_reclaim_distance'
mm/page_alloc.c -> 0x6
Now, it can complie right and loongson3-llsc-check returns success.
And it can start success.
Origin(use SMP): $ lscpu
Architecture: mips64
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Model name: Loongson-3A R3 (Loongson-3A3000) @ 1450MHz
CPU max MHz: 1450.0000
CPU min MHz: 725.0000
L1d cache: 64K
L1i cache: 64K
L2 cache: 256K
L3 cache: 2048K
NUMA node0 CPU(s): 0-3
Now(not use SMP): $ lscpu
Architecture: mips64
Byte Order: Little Endian
CPU(s): 1
On-line CPU(s) list: 0
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
NUMA node(s): 1
L1d cache: 64K
L1i cache: 64K
L2 cache: 2048K
NUMA node0 CPU(s): 0
Signed-off-by: Jinyang He <hejinyang@xxxxxxxxxxx>
---
arch/mips/Kconfig | 2 +-
arch/mips/include/asm/mach-loongson64/topology.h | 4 ++++
arch/mips/include/asm/smp.h | 20 ++++++++++++++++++++
arch/mips/mm/init.c | 2 +-
mm/page_alloc.c | 6 +++---
5 files changed, 29 insertions(+), 5 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c95fa3a..c3b2864 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2876,7 +2876,7 @@ config MIPS_NR_CPU_NR_MAP_1024
config MIPS_NR_CPU_NR_MAP
int
- depends on SMP
+ default 1 if !SMP
default 1024 if MIPS_NR_CPU_NR_MAP_1024
default NR_CPUS if !MIPS_NR_CPU_NR_MAP_1024
diff --git a/arch/mips/include/asm/mach-loongson64/topology.h b/arch/mips/include/asm/mach-loongson64/topology.h
index 3414a1f..2157fe1 100644
--- a/arch/mips/include/asm/mach-loongson64/topology.h
+++ b/arch/mips/include/asm/mach-loongson64/topology.h
@@ -4,7 +4,11 @@
#ifdef CONFIG_NUMA
+#ifdef CONFIG_SMP
#define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2)
+#else
+#define cpu_to_node(cpu) 0
+#endif
extern cpumask_t __node_cpumask[];
#define cpumask_of_node(node) (&__node_cpumask[node])
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index 5d9ff61..8ea3733 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -25,6 +25,7 @@ extern cpumask_t cpu_sibling_map[];
extern cpumask_t cpu_core_map[];
extern cpumask_t cpu_foreign_map[];
+#ifdef CONFIG_SMP
static inline int raw_smp_processor_id(void)
{
#if defined(__VDSO__)
@@ -36,6 +37,7 @@ static inline int raw_smp_processor_id(void)
#endif
}
#define raw_smp_processor_id raw_smp_processor_id
+#endif
/* Map from cpu id to sequential logical cpu number. This will only
not be idempotent when cpus failed to come on-line. */
@@ -66,12 +68,14 @@ extern void calculate_cpu_foreign_map(void);
* it goes straight through and wastes no time serializing
* anything. Worst case is that we lose a reschedule ...
*/
+#ifdef CONFIG_SMP
static inline void smp_send_reschedule(int cpu)
{
extern const struct plat_smp_ops *mp_ops; /* private */
mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
}
+#endif
#ifdef CONFIG_HOTPLUG_CPU
static inline int __cpu_disable(void)
@@ -92,6 +96,8 @@ extern void play_dead(void);
#endif
#ifdef CONFIG_KEXEC
+
+#ifdef CONFIG_SMP
static inline void kexec_nonboot_cpu(void)
{
extern const struct plat_smp_ops *mp_ops; /* private */
@@ -105,6 +111,15 @@ static inline void *kexec_nonboot_cpu_func(void)
return mp_ops->kexec_nonboot_cpu;
}
+#else /* CONFIG_SMP */
+static inline void kexec_nonboot_cpu(void) { }
+
+static inline void *kexec_nonboot_cpu_func(void)
+{
+ return NULL;
+}
+#endif /* CONFIG_SMP */
+
#endif
/*
@@ -121,6 +136,7 @@ int mips_smp_ipi_allocate(const struct cpumask *mask);
*/
int mips_smp_ipi_free(const struct cpumask *mask);
+#ifdef CONFIG_SMP
static inline void arch_send_call_function_single_ipi(int cpu)
{
extern const struct plat_smp_ops *mp_ops; /* private */
@@ -134,5 +150,9 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
}
+#else /* CONFIG_SMP */
+static inline void arch_send_call_function_single_ipi(int cpu) { }
+static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) { }
+#endif /* CONFIG_SMP */
#endif /* __ASM_SMP_H */
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 6c7bbfe..867bff2 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -513,7 +513,7 @@ void __ref free_initmem(void)
free_initmem_default(POISON_FREE_INITMEM);
}
-#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP)
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0e2bab4..45a891c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3635,18 +3635,18 @@ bool zone_watermark_ok_safe(struct zone *z, unsigned int order,
free_pages);
}
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) && defined(CONFIG_SMP)
static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
{
return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) <=
node_reclaim_distance;
}
-#else /* CONFIG_NUMA */
+#else /* CONFIG_NUMA && CONFIG_SMP */
static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
{
return true;
}
-#endif /* CONFIG_NUMA */
+#endif /* CONFIG_NUMA && CONFIG_SMP */
/*
* The restriction on ZONE_DMA32 as being a suitable zone to use to avoid
--
2.1.0
