linux-kernel - [PATCH] x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk

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Message-ID: <20240405144637.17908-1-bp@kernel.org>
Date: Fri,  5 Apr 2024 16:46:37 +0200
From: bp@...nel.org
To: X86 ML <x86@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	"Borislav Petkov (AMD)" <bp@...en8.de>
Subject: [PATCH] x86/retpoline: Add NOENDBR annotation to the SRSO dummy return thunk

From: "Borislav Petkov (AMD)" <bp@...en8.de>

It 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:

  vmlinux.o: warning: objtool: .export_symbol+0x2b290: data relocation to !ENDBR: srso_alias_untrain_ret+0x0

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 arch/x86/lib/retpoline.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 0795b3464058..e674ccf720b9 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -229,6 +229,7 @@ SYM_CODE_END(srso_return_thunk)
 /* Dummy for the alternative in CALL_UNTRAIN_RET. */
 SYM_CODE_START(srso_alias_untrain_ret)
 	ANNOTATE_UNRET_SAFE
+	ANNOTATE_NOENDBR
 	ret
 	int3
 SYM_FUNC_END(srso_alias_untrain_ret)
-- 
2.43.0