On Tue, 10 Nov 2015 14:15:44 +0100,
Oliver Neukum wrote:
>
> The documentation wrongly implied that it is a core parameter.
> That is not true. If usbcore is compiled as a module, a module
> parameter needs a prefix.
The code drivers/usb/core/usb.c has the following:
/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
#ifdef MODULE
module_param(nousb, bool, 0444);
#else
core_param(nousb, nousb, bool, 0444);
#endif
... which is quite confusing.
This change was introduced by commit 785895ff1fed
USB: Don't use __module_param_call; use core_param.
IMO, the current setup is a bad mixture to try keeping some
compatibility while breaking others. We should either keep "nousb"
always working or unify as a module option.
Takashi
>
> Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
> ---
> Documentation/kernel-parameters.txt | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 22a4b68..a805dff 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -2536,8 +2536,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>
> notsc [BUGS=X86-32] Disable Time Stamp Counter
>
> - nousb [USB] Disable the USB subsystem
> -
> nowatchdog [KNL] Disable both lockup detectors, i.e.
> soft-lockup and NMI watchdog (hard-lockup).
>
> @@ -3852,6 +3850,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> USB_REQ_GET_DESCRIPTOR request in milliseconds
> (default 5000 = 5.0 seconds).
>
> + usbcore.nousb [USB] Disable the USB subsystem
> +
> usbhid.mousepoll=
> [USBHID] The interval which mice are to be polled at.
>
> --
> 2.1.4
>
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