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The call_rtas() function has never been a part of arch/powerpc, and its implementation was removed from arch/ppc by 0a26b1364f14 ("ppc: Remove CHRP, POWER3 and POWER4 support from arch/ppc"). Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20231106-rtas-trivial-v1-3-61847655c51f@linux.ibm.com