dattobd does not support loongarch64

[liang-001]

hi, i meet a problem with dattobd whose version is 0.12.0 in loongarch64. I modify some code(regs->ip to regs->csr_era), so that it can be compiled successfully in loongarch64, and modprobe dattobd is ok. However, when i setup-snapshot, something wrong happen.

the dmesg's output is as follow:
[ 6806.246141] CPU: 2 PID: 236 Comm: kworker/2:1H Tainted: G D W O 4.19.0-loongson-3-desktop #7206
[ 6806.246142] Hardware name: Loongson LM-LS3A5000-7A1000-1w-V01-pc_A2101/LM-LS3A5000-7A1000-1w-V01-pc_A2101, BIOS KL.4.1H.LM.D.016.210607.R 06/07/2021
[ 6806.246394] Workqueue: kblockd blk_mq_run_work_fn
[ 6806.246396] pc 9000000000765f88 ra 9000000000765ee4 tp 900000045efbc000 sp 900000045efbfc90
[ 6806.246397] a0 0000000000000001 a1 900000046957f300 a2 0000000000000000 a3 900000046957f400
[ 6806.246398] a4 0000000000000001 a5 9000000000759bb0 a6 9000000001b27b62 a7 0000000000000032
[ 6806.246398] t0 0000000000000000 t1 0000000000000003 t2 0000000000000000 t3 900000046957f300
[ 6806.246399] t4 0000000000000000 t5 00000000000000b0 t6 0000000000000000 t7 0000000000000000
[ 6806.246400] t8 0000000000000000 u0 9000000478722b00 s9 000000000000000a s0 9000000478722b00
[ 6806.246401] s1 90000004789a4000 s2 000000000000000a s3 0000000000000000 s4 0000000000000001
[ 6806.246402] s5 90000004786a7df0 s6 0000000000000000 s7 0000000000000004 s8 9000000478722b40
[ 6806.246404] ra: 9000000000765ee4 blk_mq_end_request+0x2c/0xd8
[ 6806.246405] ERA: 9000000000765f88 blk_mq_end_request+0xd0/0xd8
[ 6806.246406] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
[ 6806.246409] PRMD: 00000004 (PPLV0 +PIE -PWE)
[ 6806.246410] EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
[ 6806.246412] ECFG: 00071c1c (LIE=2-4,10-12 VS=7)
[ 6806.246414] ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0)
[ 6806.246416] PRID: 0014c010 (Loongson-64bit, Loongson-3A5000)
[ 6806.246416] Modules linked in: nfnetlink_queue nfnetlink_log nfnetlink dm_mod fuse udl bnep joydev st bluetooth ecdh_generic rfkill binfmt_misc vfat fat kvm sg efi_pstore ipmi_ssif snd_hda_intel ipmi_si sw_se_echip_drv efivars ipmi_devintf ipmi_msghandler uos_resources(O) uos_bluetooth_connection_control(O) ib_iser rdma_cm iw_cm ib_cm ib_core configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi lightorange lightnut lightfig lightcherry filearmor(O) deepin_netmonitor(O) dattobd(O) efivarfs ip_tables x_tables autofs4 amdgpu mfd_core chash gpu_sched radeon r8168 rtc_efi sr_mod cdrom
[ 6806.246436] Process kworker/2:1H (pid: 236, threadinfo=000000004593ea0a, task=000000004d05d876)
[ 6806.246437] Stack : 9000000478722b00 90000004789a4000 900000045efbfd40 90000000007687f4
[ 6806.246438] 900000000700ee40 9000000000268cec 90000000013dff70 90000004786a7df0
[ 6806.246440] 9000000478722b00 9000000000791601 900000047871fe40 9000000001b23a80
[ 6806.246441] 9000000000db2e18 0000000000000000 90000004786a7df0 90000004789a6c00
[ 6806.246442] 900000045efbfd40 9000000478722b40 9000000478722b00 90000004789a4000
[ 6806.246444] 900000047799c0c0 900000000076dc60 900000045efbfd40 900000045efbfd40
[ 6806.246445] 0000000000000000 90000004789a4048 0000000000000001 90000004786a7df0
[ 6806.246447] 90000004789a4008 900000045efbfd90 90000004789a4000 900000000076e50c
[ 6806.246448] 900000045efbfd90 900000045efbfd90 900000000700ea80 90000004789a4040
[ 6806.246449] 900000047799c0c0 0000000000000000 90000004789a4000 9000000000766880
[ 6806.246451] ...
[ 6806.246452] Call Trace:
[ 6806.246454] [<9000000000765f88>] blk_mq_end_request+0xd0/0xd8
[ 6806.246456] [<90000000007687f0>] blk_mq_dispatch_rq_list+0x548/0x6c8
[ 6806.246458] [<900000000076dc5c>] blk_mq_do_dispatch_sched+0x6c/0x108
[ 6806.246460] [<900000000076e508>] blk_mq_sched_dispatch_requests+0x128/0x1d0
[ 6806.246462] [<900000000076687c>] __blk_mq_run_hw_queue+0xb4/0x170
[ 6806.246465] [<9000000000246650>] process_one_work+0x1b0/0x428
[ 6806.246467] [<9000000000246a40>] worker_thread+0x178/0x480
[ 6806.246470] [<900000000024de04>] kthread+0x12c/0x138
[ 6806.246474] [<90000000002030c8>] ret_from_kernel_thread+0x8/0x10
[ 6806.246475] Code: 53ff83ff 57fd43ff 53ffc7ff <002a0001> 03400000 0015002c 03400000 02ff8063 29c06061

[ 6806.246479] ---[ end trace 1f1d8e3ec18c0730 ]---