On Wed, 05 Feb 2025 22:21:31 -0700 Uday Shankar wrote: > Currently, netconsole has two methods of configuration - module > parameter and configfs. The former interface allows for netconsole > activation earlier during boot (by specifying the module parameter on > the kernel command line), so it is preferred for debugging issues which > arise before userspace is up/the configfs interface can be used. The > module parameter syntax requires specifying the egress interface name. > This requirement makes it hard to use for a couple reasons: > - The egress interface name can be hard or impossible to predict. For > example, installing a new network card in a system can change the > interface names assigned by the kernel. > - When constructing the module parameter, one may have trouble > determining the original (kernel-assigned) name of the interface > (which is the name that should be given to netconsole) if some stable > interface naming scheme is in effect. A human can usually look at > kernel logs to determine the original name, but this is very painful > if automation is constructing the parameter. > > For these reasons, allow selection of the egress interface via MAC > address when configuring netconsole using the module parameter. Update > the netconsole documentation with an example of the new syntax. > Selection of egress interface by MAC address via configfs is far less > interesting (since when this interface can be used, one should be able > to easily convert between MAC address and interface name), so it is left > unimplemented. Sounds like dev_getbyhwaddr_rcu() will warn here. Either wrap it in RCU temporarily or combine the series with Breno's patch to add a new helper? -- pw-bot: cr
