Dear Linux folks,
I am trying to reduce the start-up time of the Linux kernel on an old Lenovo X60. Looking through the time stamps of Linux 4.16-rc7+, the modules `lp` and `ppdev` both take more than ten milliseconds to initialize according to `initcall_debug`.
```[ 8.337692] calling parport_default_proc_register+0x0/0x1000 [parport] @ 245 [ 8.337735] initcall parport_default_proc_register+0x0/0x1000 [parport] returned 0 after 30 usecs
[ 8.359066] calling lp_init_module+0x0/0x1000 [lp] @ 245 [ 8.381317] lp: driver loaded but no devices found[ 8.385310] initcall lp_init_module+0x0/0x1000 [lp] returned 0 after 25613 usecs
[ 8.401727] calling ppdev_init+0x0/0x1000 [ppdev] @ 245 [ 8.411427] ppdev: user-space parallel port driver[ 8.415390] initcall ppdev_init+0x0/0x1000 [ppdev] returned 0 after 13329 usecs
[ 8.434018] calling parport_pc_init+0x0/0xeed [parport_pc] @ 245[ 8.435657] initcall parport_pc_init+0x0/0xeed [parport_pc] returned 0 after 1589 usecs
[ 9.343691] EXT4-fs (dm-0): re-mounted. Opts: errors=remount-ro,discard[ 9.742084] systemd-journald[271]: Received request to flush runtime journal from PID 1
[ 10.049050] calling acpi_cpufreq_init+0x0/0x1000 [acpi_cpufreq] @ 297[ 10.049668] initcall acpi_cpufreq_init+0x0/0x1000 [acpi_cpufreq] returned 0 after 581 usecs
```Furthermore, looking at the messages, it looks like it’s in the “hotpath”. If that is true, is there a way to load that in parallel of the other Linux kernel stuff?
Hints to get more insight are much appreciated. Kind regards, Paul
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