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[ Upstream commit469169803d] Some instructions are only available on the 64-bit architecture. Bi-arch compilers that default to -m32 need the explicit -m64 option to evaluate them properly. Fixes:18e66b695e("x86/shstk: Add Kconfig option for shadow stack") Closes: https://lore.kernel.org/all/20240612-as-instr-opt-wrussq-v2-1-bd950f7eead7@gmail.com/ Reported-by: Dmitry Safonov <0x7f454c46@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Dmitry Safonov <0x7f454c46@gmail.com> Link: https://lore.kernel.org/r/20240612050257.3670768-1-masahiroy@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>