Andy Lutomirski <[email protected]> writes:
> On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <[email protected]> wrote:
>>
>> This is another step towards more C-code and less convoluted ASM.
>>
>> Similar to the entry path, invoke the tracer before context tracking which
>> might turn off RCU and invoke lockdep as the last step before going back to
>> user space. Annotate the code sections in exit_to_user_mode() accordingly
>> so objtool won't complain about the tracer invocation.
>
> Acked-by: Andy Lutomirski <[email protected]>
>
> Note to self: the nmi code needs to be reworked to go through
> prepare_exit_to_usermode(), too. I'll do this once this whole pile
> lands.
Why? NMI does not set any work stuff or preemption. If something needs
to be done then NMI raises irq_work which uses the regular path.
Thanks,
tglx
