RE: [RFC PATCH] rseq: x86: implement abort-at-ip extension

That being said, there might be an architecture agnostic alternative available.
On abort of a RSEQ_CS_FLAG_ABORT_AT_IP critical section, we could let the kernel
decrement/increment the stack pointer to make room for a pointer (depending if the
stack grows down or up). It would then store the abort-at-ip value at the top of
stack.

Stack redzone in a leaf function?

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