5.15-stable review patch. If anyone has any objections, please let me know.
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From: Huang Shijie shijie@os.amperecomputing.com
[ Upstream commit 75b5e0bf90bffaca4b1f19114065dc59f5cc161f ]
In current code, init_irq_stacks() will call cpu_to_node(). The cpu_to_node() depends on percpu "numa_node" which is initialized in: arch_call_rest_init() --> rest_init() -- kernel_init() --> kernel_init_freeable() --> smp_prepare_cpus()
But init_irq_stacks() is called in init_IRQ() which is before arch_call_rest_init().
So in init_irq_stacks(), the cpu_to_node() does not work, it always return 0. In NUMA, it makes the node 1 cpu accesses the IRQ stack which is in the node 0.
This patch fixes it by: 1.) export the early_cpu_to_node(), and use it in the init_irq_stacks(). 2.) change init_irq_stacks() to __init function.
Reviewed-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Huang Shijie shijie@os.amperecomputing.com Link: https://lore.kernel.org/r/20231124031513.81548-1-shijie@os.amperecomputing.c... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/kernel/irq.c | 5 +++-- drivers/base/arch_numa.c | 2 +- include/asm-generic/numa.h | 2 ++ 3 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c index bda49430c9ea..dab45f19df49 100644 --- a/arch/arm64/kernel/irq.c +++ b/arch/arm64/kernel/irq.c @@ -19,6 +19,7 @@ #include <linux/kprobes.h> #include <linux/scs.h> #include <linux/seq_file.h> +#include <asm/numa.h> #include <linux/vmalloc.h> #include <asm/daifflags.h> #include <asm/vmap_stack.h> @@ -48,13 +49,13 @@ static void init_irq_scs(void) }
#ifdef CONFIG_VMAP_STACK -static void init_irq_stacks(void) +static void __init init_irq_stacks(void) { int cpu; unsigned long *p;
for_each_possible_cpu(cpu) { - p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu)); + p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, early_cpu_to_node(cpu)); per_cpu(irq_stack_ptr, cpu) = p; } } diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c index 00fb4120a5b3..bce0902dccb4 100644 --- a/drivers/base/arch_numa.c +++ b/drivers/base/arch_numa.c @@ -144,7 +144,7 @@ void __init early_map_cpu_to_node(unsigned int cpu, int nid) unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; EXPORT_SYMBOL(__per_cpu_offset);
-static int __init early_cpu_to_node(int cpu) +int __init early_cpu_to_node(int cpu) { return cpu_to_node_map[cpu]; } diff --git a/include/asm-generic/numa.h b/include/asm-generic/numa.h index 1a3ad6d29833..c32e0cf23c90 100644 --- a/include/asm-generic/numa.h +++ b/include/asm-generic/numa.h @@ -35,6 +35,7 @@ int __init numa_add_memblk(int nodeid, u64 start, u64 end); void __init numa_set_distance(int from, int to, int distance); void __init numa_free_distance(void); void __init early_map_cpu_to_node(unsigned int cpu, int nid); +int __init early_cpu_to_node(int cpu); void numa_store_cpu_info(unsigned int cpu); void numa_add_cpu(unsigned int cpu); void numa_remove_cpu(unsigned int cpu); @@ -46,6 +47,7 @@ static inline void numa_add_cpu(unsigned int cpu) { } static inline void numa_remove_cpu(unsigned int cpu) { } static inline void arch_numa_init(void) { } static inline void early_map_cpu_to_node(unsigned int cpu, int nid) { } +static inline int early_cpu_to_node(int cpu) { return 0; }
#endif /* CONFIG_NUMA */