x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk
srso_alias_untrain_ret() is special code, even if it is a dummy
which is called in the !SRSO case, so annotate it like its real
counterpart, to address the following objtool splat:
vmlinux.o: warning: objtool: .export_symbol+0x2b290: data relocation to !ENDBR: srso_alias_untrain_ret+0x0
Fixes: 4535e1a417
("x86/bugs: Fix the SRSO mitigation on Zen3/4")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240405144637.17908-1-bp@kernel.org
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@ -229,6 +229,7 @@ SYM_CODE_END(srso_return_thunk)
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/* Dummy for the alternative in CALL_UNTRAIN_RET. */
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SYM_CODE_START(srso_alias_untrain_ret)
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ANNOTATE_UNRET_SAFE
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ANNOTATE_NOENDBR
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ret
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int3
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SYM_FUNC_END(srso_alias_untrain_ret)
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