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Date: Thu, 11 Apr 2024 09:05:07 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Arnd Bergmann <arnd@...db.de>,
Marc Zyngier <maz@...nel.org>
Cc: loongarch@...ts.linux.dev,
linux-kernel@...r.kernel.org,
loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v3 1/4] LoongArch: Move CONFIG_HAVE_SETUP_PER_CPU_AREA related code to smp.c
Currently, if CONFIG_NUMA is not set but CONFIG_SMP is set, the arch
specified setup_per_cpu_areas() in arch/loongarch/kernel/numa.c will
not be built and the generic setup_per_cpu_areas() in mm/percpu.c is
actually used, this is not reasonable and does not work as intended.
Let us select HAVE_SETUP_PER_CPU_AREA unconditionally and then move
CONFIG_HAVE_SETUP_PER_CPU_AREA related code from numa.c to smp.c to
avoid this problem.
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
arch/loongarch/Kconfig | 2 +-
arch/loongarch/kernel/numa.c | 58 -----------------------------------
arch/loongarch/kernel/smp.c | 59 ++++++++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 59 deletions(-)
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index a5f300ec6f28..64052ae2c2af 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -151,7 +151,7 @@ config LOONGARCH
select HAVE_RUST
select HAVE_SAMPLE_FTRACE_DIRECT
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
- select HAVE_SETUP_PER_CPU_AREA if NUMA
+ select HAVE_SETUP_PER_CPU_AREA
select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index 8fe21f868f72..49dc1d932ce2 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -48,64 +48,6 @@ EXPORT_SYMBOL(__cpuid_to_node);
nodemask_t numa_nodes_parsed __initdata;
-#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
-unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
-EXPORT_SYMBOL(__per_cpu_offset);
-
-static int __init pcpu_cpu_to_node(int cpu)
-{
- return early_cpu_to_node(cpu);
-}
-
-static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
-{
- if (early_cpu_to_node(from) == early_cpu_to_node(to))
- return LOCAL_DISTANCE;
- else
- return REMOTE_DISTANCE;
-}
-
-void __init pcpu_populate_pte(unsigned long addr)
-{
- populate_kernel_pte(addr);
-}
-
-void __init setup_per_cpu_areas(void)
-{
- unsigned long delta;
- unsigned int cpu;
- int rc = -EINVAL;
-
- if (pcpu_chosen_fc == PCPU_FC_AUTO) {
- if (nr_node_ids >= 8)
- pcpu_chosen_fc = PCPU_FC_PAGE;
- else
- pcpu_chosen_fc = PCPU_FC_EMBED;
- }
-
- /*
- * Always reserve area for module percpu variables. That's
- * what the legacy allocator did.
- */
- if (pcpu_chosen_fc != PCPU_FC_PAGE) {
- rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
- PERCPU_DYNAMIC_RESERVE, PMD_SIZE,
- pcpu_cpu_distance, pcpu_cpu_to_node);
- if (rc < 0)
- pr_warn("%s allocator failed (%d), falling back to page size\n",
- pcpu_fc_names[pcpu_chosen_fc], rc);
- }
- if (rc < 0)
- rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, pcpu_cpu_to_node);
- if (rc < 0)
- panic("cannot initialize percpu area (err=%d)", rc);
-
- delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
- for_each_possible_cpu(cpu)
- __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
-}
-#endif
-
/*
* Get nodeid by logical cpu number.
* __cpuid_to_node maps phyical cpu id to node, so we
diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index aabee0b280fe..88b9c6b68d1e 100644
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -29,6 +29,7 @@
#include <asm/loongson.h>
#include <asm/mmu_context.h>
#include <asm/numa.h>
+#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/time.h>
@@ -717,3 +718,61 @@ void flush_tlb_one(unsigned long vaddr)
on_each_cpu(flush_tlb_one_ipi, (void *)vaddr, 1);
}
EXPORT_SYMBOL(flush_tlb_one);
+
+#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(__per_cpu_offset);
+
+static int __init pcpu_cpu_to_node(int cpu)
+{
+ return early_cpu_to_node(cpu);
+}
+
+static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
+{
+ if (early_cpu_to_node(from) == early_cpu_to_node(to))
+ return LOCAL_DISTANCE;
+ else
+ return REMOTE_DISTANCE;
+}
+
+void __init pcpu_populate_pte(unsigned long addr)
+{
+ populate_kernel_pte(addr);
+}
+
+void __init setup_per_cpu_areas(void)
+{
+ unsigned long delta;
+ unsigned int cpu;
+ int rc = -EINVAL;
+
+ if (pcpu_chosen_fc == PCPU_FC_AUTO) {
+ if (nr_node_ids >= 8)
+ pcpu_chosen_fc = PCPU_FC_PAGE;
+ else
+ pcpu_chosen_fc = PCPU_FC_EMBED;
+ }
+
+ /*
+ * Always reserve area for module percpu variables. That's
+ * what the legacy allocator did.
+ */
+ if (pcpu_chosen_fc != PCPU_FC_PAGE) {
+ rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
+ PERCPU_DYNAMIC_RESERVE, PMD_SIZE,
+ pcpu_cpu_distance, pcpu_cpu_to_node);
+ if (rc < 0)
+ pr_warn("%s allocator failed (%d), falling back to page size\n",
+ pcpu_fc_names[pcpu_chosen_fc], rc);
+ }
+ if (rc < 0)
+ rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, pcpu_cpu_to_node);
+ if (rc < 0)
+ panic("cannot initialize percpu area (err=%d)", rc);
+
+ delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
+ for_each_possible_cpu(cpu)
+ __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
+}
+#endif
--
2.42.0
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