preempt-rt + live patching + arm64

[Aaron Simmons <paleozogt@xxxxxxxxx>]

I'm trying to bring preempt-rt into a kernel that has had
live-patching for arm64 applied.  Specifically, this patch:
   https://lkml.org/lkml/2021/6/4/1169

There's a conflict in some definitions of arm64's thread_info.h:
    ++<<<<<<< HEAD
    +#define TIF_PATCH_PENDING     7       /* pending live patching update */
    ++=======
    + #define TIF_NEED_RESCHED_LAZY 7
    ++>>>>>>> 3fc990649e4f (PREEMPT_RT 5.15.93-rt58)

It appears that the TIF_XXX range is getting crowded. :)

Resolving the conflict seems straightforward -- I should just give
TIF_NEED_RESCHED_LAZY a new value.  But I wanted to double-check --
does the range of these values matter?

I see over in 32-bit arm's thread_info.h a comment about the "range of
0..15" being important, but I'm not sure if that applies to 64-bit or
not.


Thanks,
aaron