Re: [PATCH 1/2] KVM: selftests: Make rseq compatible with glibc-2.35

* Gavin Shan:

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__builtin_thread_pointer doesn't work on all architectures/GCC versions. Is this a problem for selftests?

It's a problem as the test case is running on all architectures. I think I need introduce our own __builtin_thread_pointer() for where it's not supported: (1) PowerPC (2) x86 without GCC 11

Please let me know if I still have missed cases where __buitin_thread_pointer() isn't supported?

As far as I know, these are the two outliers that also have rseq support. The list is a bit longer if we also consider non-rseq architectures (csky, hppa, ia64, m68k, microblaze, sparc, don't know about the Linux architectures without glibc support).

Thanks, Florian