NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id #492
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…e id During the kernel booting, the generic cpu_to_node() is called too early in arm64, powerpc and riscv when CONFIG_NUMA is enabled. There are at least four places in the common code where the generic cpu_to_node() is called before it is initialized: 1.) early_trace_init() in kernel/trace/trace.c 2.) sched_init() in kernel/sched/core.c 3.) init_sched_fair_class() in kernel/sched/fair.c 4.) workqueue_init_early() in kernel/workqueue.c In order to fix the bug, the patch introduces early_numa_node_init() which is called after smp_prepare_boot_cpu() in start_kernel. early_numa_node_init will initialize the "numa_node" as soon as the early_cpu_to_node() is ready, before the cpu_to_node() is called at the first time. Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com> Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
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Pull request for series with
subject: NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id
version: 1
url: https://patchwork.kernel.org/project/linux-riscv/list/?series=817993