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Since commit95a8ddde36("irqchip/riscv-aplic: Preserve APLIC states across suspend/resume"), when multiple NUMA nodes exist and AIA is not configured as "none", aplic_probe() is called multiple times. This leads to register_syscore(&aplic_syscore) being invoked repeatedly, causing the following Oops: list_add double add: new=ffffffffb91461f0, prev=ffffffffb91461f0, next=ffffffffb915c408. [<ffffffffb7b5c8ca>] __list_add_valid_or_report+0x60/0xc0 [<ffffffffb7cc3236>] register_syscore+0x3e/0x70 [<ffffffffb7b8d61c>] aplic_probe+0xc6/0x112 Fix this by registering syscore operations only once, using a static variable aplic_syscore_registered to track registration. [ tglx: Trim backtrace properly ] Fixes:95a8ddde36("irqchip/riscv-aplic: Preserve APLIC states across suspend/resume") Signed-off-by: Jessica Liu <liu.xuemei1@zte.com.cn> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260310141731145xMwLsyvXl9Gw-m6A4VRYj@zte.com.cn