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I'm developing PCIe driver and there is a RC switch which has some devices conneted to, including a  nvme device. Can somebody help double-check and comment? Sent to NVME related mails and CCed to MM, who might be interested in this question. Thanks, Chen [    2.075408] ------------[ cut here ]------------ [    2.075414] WARNING: CPU: 51 PID: 403 at mm/page_alloc.c:4727 __alloc_pages_noprof+0x788/0xd08 [    2.075432] Modules linked in: [    2.075442] CPU: 51 UID: 0 PID: 403 Comm: kworker/u257:0 Not tainted 6.13.0-rc1+ #1 [    2.075449] Hardware name: Milk-V Pioneer (DT) [    2.075454] Workqueue: async async_run_entry_fn [    2.075467] epc : __alloc_pages_noprof+0x788/0xd08 [    2.075473]  ra : __dma_direct_alloc_pages.isra.0+0x1f8/0x434 [    2.075480] epc : ffffffff8029e252 ra : ffffffff800d1f96 sp : ffffffd7017bb840 [    2.075485]  gp : ffffffff82072a28 tp : ffffffd701761c00 t0 : ffffffd703b023b8 [    2.075488]  t1 : 0000000000000000 t2 : 6d7768206e6f6d77 s0 : ffffffd7017bb9e0 [    2.075491]  s1 : 0000000000000cc0 a0 : 0000000000000cc0 a1 : 000000000000000e [    2.075495]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000001 [    2.075498]  a5 : ffffffff82013d7a a6 : 3fffffffffffffff a7 : 000000000000003e [    2.075501]  s2 : ffffffffffffffff s3 : 0000000000000000 s4 : 0000000004000000 [    2.075504]  s5 : 0000000000003fff s6 : ffffffffffffffff s7 : 000000000000000e [    2.075508]  s8 : ffffffff8213d190 s9 : 000000000000000e s10: 0000000000000100 [    2.075510]  s11: ffffffd70034d3c0 t3 : ffffffd700260f00 t4 : ffffffd700260f00 [    2.075514]  t5 : ffffffd700260000 t6 : ffffffd7017bb6d8 [    2.075516] status: 0000000200000120 badaddr: 0000000000000000 cause: 0000000000000003 [    2.075521] [] __alloc_pages_noprof+0x788/0xd08 [    2.075527] [] __dma_direct_alloc_pages.isra.0+0x1f8/0x434 [    2.075533] [] dma_direct_alloc_pages+0x28/0x11c [    2.075537] [] __dma_alloc_pages+0x3a/0x54 [    2.075547] [] dma_alloc_noncontiguous+0x8e/0x1c6 [    2.075551] [] nvme_setup_host_mem+0x2a8/0x446 [    2.075558] [] nvme_probe+0x730/0x802 [    2.075564] [] local_pci_probe+0x40/0x82 [    2.075572] [] pci_device_probe+0xca/0x1f0 [    2.075578] [] really_probe+0x9e/0x33e [    2.075589] [] __driver_probe_device+0x7c/0x132 [    2.075595] [] driver_probe_device+0x38/0xc6 [    2.075601] [] __driver_attach_async_helper+0x4a/0xc4 [    2.075607] [] async_run_entry_fn+0x34/0x126 [    2.075613] [] process_one_work+0x172/0x316 [    2.075621] [] worker_thread+0x2e2/0x448 [    2.075626] [] kthread+0xc2/0xe2 [    2.075633] [] ret_from_fork+0xe/0x1c [    2.075645] ---[ end trace 0000000000000000 ]--- [    2.094302] nvme nvme0: allocated 64 MiB host memory buffer (16 segments). [    2.223519] nvme nvme0: 1/0/0 default/read/poll queues