[    3.418810] ------------[ cut here ]------------
[    3.423391] WARNING: CPU: 0 PID: 1 at /home/mpoirier/work/remoteproc/kernel-review/fs/char_dev.c:486 cdev_add+0x80/0xac
[    3.434190] Modules linked in:
[    3.437217] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc1-17330-g084f2b5516e7-dirty #158
[    3.445824] Hardware name: STM32 (Device Tree Support)
[    3.450990] [<c0311b20>] (unwind_backtrace) from [<c030bd28>] (show_stack+0x10/0x14)
[    3.458721] [<c030bd28>] (show_stack) from [<c071bdbc>] (dump_stack+0xc8/0xdc)
[    3.465944] [<c071bdbc>] (dump_stack) from [<c0345bd0>] (__warn+0xdc/0xf4)
[    3.472817] [<c0345bd0>] (__warn) from [<c0345c98>] (warn_slowpath_fmt+0xb0/0xb8)
[    3.480303] [<c0345c98>] (warn_slowpath_fmt) from [<c04a0cf4>] (cdev_add+0x80/0xac)
[    3.487965] [<c04a0cf4>] (cdev_add) from [<c0d8ef80>] (rproc_char_device_add+0x88/0x9c)
[    3.495971] [<c0d8ef80>] (rproc_char_device_add) from [<c0d8b560>] (rproc_add+0x14/0xfc)
[    3.504064] [<c0d8b560>] (rproc_add) from [<c0d8fba0>] (stm32_rproc_probe+0x3ec/0x594)
[    3.511988] [<c0d8fba0>] (stm32_rproc_probe) from [<c09da094>] (platform_drv_probe+0x48/0x98)
[    3.520514] [<c09da094>] (platform_drv_probe) from [<c09d8070>] (really_probe+0x218/0x348)
[    3.528780] [<c09d8070>] (really_probe) from [<c09d82ac>] (driver_probe_device+0x5c/0xb4)
[    3.536961] [<c09d82ac>] (driver_probe_device) from [<c09d84ac>] (device_driver_attach+0x58/0x60)
[    3.545839] [<c09d84ac>] (device_driver_attach) from [<c09d8534>] (__driver_attach+0x80/0xbc)
[    3.554369] [<c09d8534>] (__driver_attach) from [<c09d63b0>] (bus_for_each_dev+0x74/0xb4)
[    3.562550] [<c09d63b0>] (bus_for_each_dev) from [<c09d73a4>] (bus_add_driver+0x164/0x1e8)
[    3.570818] [<c09d73a4>] (bus_add_driver) from [<c09d8fb8>] (driver_register+0x7c/0x114)
[    3.578914] [<c09d8fb8>] (driver_register) from [<c030204c>] (do_one_initcall+0x54/0x22c)
[    3.587097] [<c030204c>] (do_one_initcall) from [<c1600fec>] (kernel_init_freeable+0x1a4/0x20c)
[    3.595800] [<c1600fec>] (kernel_init_freeable) from [<c0f4d0f4>] (kernel_init+0x8/0x110)
[    3.603980] [<c0f4d0f4>] (kernel_init) from [<c03001a8>] (ret_from_fork+0x14/0x2c)
[    3.611546] Exception stack(0xe68b3fb0 to 0xe68b3ff8)
[    3.616598] 3fa0:                                     00000000 00000000 00000000 00000000
[    3.624782] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    3.632961] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    3.639644] ---[ end trace 0db0a065892079af ]---