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/boot/retpoline-4.4.0-1075-aws is in linux-image-4.4.0-1075-aws 4.4.0-1075.85.

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arch/x86/platform/efi/efi_stub_64.S .text efi_call callq *%rdi
arch/x86/platform/efi/efi_thunk_64.S .text efi64_thunk callq *%rbx
arch/x86/platform/efi/efi_thunk_64.S .text efi_enter32 callq *%rdi