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

Al Viro
2022-01-05T05:01:48Z

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().