aaronpuchert added a comment.

Thread safety attributes want **callers** of a function to have the same 
attribute, while this change wants **callees** to have the same attribute. So 
the attributes propagate in different directions.

By contraposition <https://en.wikipedia.org/wiki/Contraposition> the absence of 
an attribute propagates the other way around as the attribute itself, so you 
could have a role "untrusted", and callers of untrusted functions would have to 
be untrusted as well.

I guess it depends on how many functions need to be annotated one way or the 
other, if the TCB-based functions are a small subset of the code then this 
attribute is better, if most functions are based on the TCB and only some are 
not, the capability-based approach would be better.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91898/new/

https://reviews.llvm.org/D91898

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