x86/srso: Unexport untraining functions

These functions aren't called outside of retpoline.S.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/1ae080f95ce7266c82cba6d2adde82349b832654.1693889988.git.jpoimboe@kernel.org

arch/x86/include/asm/nospec-branch.h

@@ -352,10 +352,6 @@ extern void retbleed_return_thunk(void);
 extern void srso_return_thunk(void);
 extern void srso_alias_return_thunk(void);
 
-extern void retbleed_untrain_ret(void);
-extern void srso_untrain_ret(void);
-extern void srso_alias_untrain_ret(void);
-
 extern void entry_untrain_ret(void);
 extern void entry_ibpb(void);
 

arch/x86/lib/retpoline.S

@@ -157,7 +157,6 @@ SYM_START(srso_alias_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	lfence
 	jmp srso_alias_return_thunk
 SYM_FUNC_END(srso_alias_untrain_ret)
-__EXPORT_THUNK(srso_alias_untrain_ret)
 
 	.section .text..__x86.rethunk_safe
 #else
@@ -215,7 +214,7 @@ SYM_CODE_END(srso_alias_return_thunk)
  */
 	.align 64
 	.skip 64 - (retbleed_return_thunk - retbleed_untrain_ret), 0xcc
-SYM_START(retbleed_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(retbleed_untrain_ret, SYM_L_LOCAL, SYM_A_NONE)
 	ANNOTATE_NOENDBR
 	/*
 	 * As executed from retbleed_untrain_ret, this is:
@@ -263,7 +262,6 @@ SYM_CODE_END(retbleed_return_thunk)
 	jmp retbleed_return_thunk
 	int3
 SYM_FUNC_END(retbleed_untrain_ret)
-__EXPORT_THUNK(retbleed_untrain_ret)
 
 /*
  * SRSO untraining sequence for Zen1/2, similar to retbleed_untrain_ret()
@@ -277,7 +275,7 @@ __EXPORT_THUNK(retbleed_untrain_ret)
  */
 	.align 64
 	.skip 64 - (srso_safe_ret - srso_untrain_ret), 0xcc
-SYM_START(srso_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_untrain_ret, SYM_L_LOCAL, SYM_A_NONE)
 	ANNOTATE_NOENDBR
 	.byte 0x48, 0xb8
 
@@ -298,7 +296,6 @@ SYM_INNER_LABEL(srso_safe_ret, SYM_L_GLOBAL)
 	ud2
 SYM_CODE_END(srso_safe_ret)
 SYM_FUNC_END(srso_untrain_ret)
-__EXPORT_THUNK(srso_untrain_ret)
 
 SYM_CODE_START(srso_return_thunk)
 	UNWIND_HINT_FUNC