[Buildroot] [PATCH v1] package/busybox: Avoid "can't create /proc/sys/kernel/hotplug" error
Andy Shevchenko
andriy.shevchenko at linux.intel.com
Fri May 24 13:25:48 UTC 2019
On Fri, May 24, 2019 at 09:49:30AM +0200, Peter Korsgaard wrote:
> >>>>> "Peter" == Peter Korsgaard <peter at korsgaard.com> writes:
>
> >>>>> "Andy" == Andy Shevchenko <andriy.shevchenko at linux.intel.com> writes:
> >> At runtime on most of the modern kernels [1] S10mdev script produces an error:
> >> /etc/init.d/S10mdev: line 9: can't create /proc/sys/kernel/hotplug: nonexistent directory
>
> >> since the commit
>
> >> caae7fa1d737 ("busybox: register mdev as hotplug helper when selected")
>
> >> added it unconditionally.
>
> >> Check the presence of procfs node before writing to it.
>
> >> [1]: Linux kernels with the commit
> >> 86d56134f1b6 ("kobject: Make support for uevent_helper optional.")
> >> applied.
>
> > But how can mdev work on such setups?
At least the script is used to initialize modules at the boot time.
What happens afterwards I didn't investigate. I have no such issues.
> To be clear, if mdev needs CONFIG_UEVENT_HELPER=y for hotplug
> notifications, then we should rather force that in linux/linux.mk and
> mention the dependency in the mdev help text rather than silently not
> having hotplug work.
>
> I have marked this patch as changes requested in patchwork.
Kernel can be built outside of Buildroot. Still this needs to be fixed.
--
With Best Regards,
Andy Shevchenko
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