Debian SID kernel doesn't boot on PowerBook 3400c

[Finn Thain]

On Fri, 6 Aug 2021, Christophe Leroy wrote:

> 
> I have cooked a tentative fix for that KUAP stuff.
> Could you try the branch 'bugtest' at https://github.com/chleroy/linux.git
> 

Thanks, Christophe.

Stan, please test the following build.

$ git remote add chleroy-linux https://github.com/chleroy/linux.git -f -t bugtest
...
$ git checkout chleroy-linux/bugtest
HEAD is now at 63e3756d1bdf powerpc/interrupts: Also perform KUAP/KUEP lock and usertime accounting on NMI
$ cp ../dot-config-powermac-5.13 .config
$ scripts/config -e CONFIG_PPC_KUAP -e CONFIG_PPC_KUAP_DEBUG -e CONFIG_VMAP_STACK
$ make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- -j4 clean olddefconfig vmlinux
$ egrep "CONFIG_PPC_KUAP|CONFIG_VMAP_STACK" .config
$ strings vmlinux |grep "Linux version"

If that kernel produces errors, I'd try a second build as well:

$ scripts/config -e CONFIG_PPC_KUAP -e CONFIG_PPC_KUAP_DEBUG -d CONFIG_VMAP_STACK
$ make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- -j4 clean olddefconfig vmlinux
$ egrep "CONFIG_PPC_KUAP|CONFIG_VMAP_STACK" .config
$ strings vmlinux |grep "Linux version"

Please boot using the same kernel parameters as last time and capture the 
serial console logs. In case we're still dealing with intermittent bugs it 
might be necessary to repeat these tests so I suggest you retain the 
vmlinux files.