Re: [PATCH 02/10] exit: Add and use make_task_dead.

[Al Viro]

On Wed, Dec 08, 2021 at 02:25:24PM -0600, Eric W. Biederman wrote:
> There are two big uses of do_exit.  The first is it's design use to be
> the guts of the exit(2) system call.  The second use is to terminate
> a task after something catastrophic has happened like a NULL pointer
> in kernel code.
> 
> Add a function make_task_dead that is initialy exactly the same as
> do_exit to cover the cases where do_exit is called to handle
> catastrophic failure.  In time this can probably be reduced to just a
> light wrapper around do_task_dead. For now keep it exactly the same so
> that there will be no behavioral differences introducing this new
> concept.
> 
> Replace all of the uses of do_exit that use it for catastraphic
> task cleanup with make_task_dead to make it clear what the code
> is doing.
> 
> As part of this rename rewind_stack_do_exit
> rewind_stack_and_make_dead.

Umm...   What about .Linvalid_mask: in arch/xtensa/kernel/entry.S?
That's an obvious case for your make_task_dead().