[RFC][PATCH 03/17] x86/cpu: Make srso_untrain_ret consistent

[Peter Zijlstra]

This does change srso_untrain_ret a little to be more consistent with
srso_alias_untrain_ret (and zen_untrain_ret). Specifically I made
srso_untrain_ret tail-call the srso_return_thunk, instead of doing the
call directly. This matches how srso_alias_untrain_ret amd
zen_untrain_ret also tail-call their respective return_thunk.

If this is a problem this can be easily fixed and a comment added to
explain -- but this way they all end with a tail-call to their own
return-thunk, which is nice and consistent.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 arch/x86/lib/retpoline.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -262,7 +262,7 @@ SYM_INNER_LABEL(srso_safe_ret, SYM_L_GLO
 	int3
 	/* end of movabs */
 	lfence
-	call srso_safe_ret
+	jmp srso_return_thunk
 	int3
 SYM_CODE_END(srso_safe_ret)
 SYM_FUNC_END(srso_untrain_ret)