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linux-user/syscall.c: Don't warn about unimplemented get_robust_list
The nature of the kernel ABI for the get_robust_list and set_robust_list syscalls means we cannot implement them in QEMU. Make get_robust_list silently return ENOSYS rather than using the default "print message and then fail ENOSYS" code path, in the same way we already do for set_robust_list, and add a comment documenting why we do this. This silences warnings which were being produced for emulating even trivial programs like 'ls' in x86-64-on-x86-64. Signed-off-by: Peter Maydell <email@example.com> Reviewed-by: Richard Henderson <firstname.lastname@example.org> Signed-off-by: Riku Voipio <email@example.com>
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