[tip: x86/bugs] x86/retpoline: Remove .text..__x86.return_thunk section

[tip-bot2 for Josh Poimboeuf]

The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     e92626af3234708fe30f53b269d210d202b95206
Gitweb:        https://git.kernel.org/tip/e92626af3234708fe30f53b269d210d202b95206
Author:        Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate:    Mon, 04 Sep 2023 22:05:02 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sat, 23 Sep 2023 14:13:03 +02:00

x86/retpoline: Remove .text..__x86.return_thunk section

The '.text..__x86.return_thunk' section has no purpose.  Remove it and
let the return thunk code live in '.text..__x86.indirect_thunk'.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/291aad1dcb2d27c6241fe3f182d66119857757fd.1693889988.git.jpoimboe@xxxxxxxxxx
---
 arch/x86/kernel/vmlinux.lds.S | 3 ---
 arch/x86/lib/retpoline.S      | 2 --
 2 files changed, 5 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 54a5596..9cdb1a7 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -132,10 +132,7 @@ SECTIONS
 		LOCK_TEXT
 		KPROBES_TEXT
 		SOFTIRQENTRY_TEXT
-#ifdef CONFIG_RETPOLINE
 		*(.text..__x86.indirect_thunk)
-		*(.text..__x86.return_thunk)
-#endif
 		STATIC_CALL_TEXT
 
 		ALIGN_ENTRY_TEXT_BEGIN
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 415521d..49f2be7 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -129,8 +129,6 @@ SYM_CODE_END(__x86_indirect_jump_thunk_array)
 
 #ifdef CONFIG_RETHUNK
 
-	.section .text..__x86.return_thunk
-
 #ifdef CONFIG_CPU_SRSO
 
 /*