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Date:   Fri, 20 Oct 2023 11:37:16 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@linutronix.de>
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Subject: [tip: x86/bugs] x86/calldepth: Rename __x86_return_skl() to
 call_depth_return_thunk()
Cc:     Josh Poimboeuf <jpoimboe@kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        "Borislav Petkov (AMD)" <bp@alien8.de>, x86@kernel.org,
        linux-kernel@vger.kernel.org
In-Reply-To: <ae44e9f9976934e3b5b47a458d523ccb15867561.1693889988.git.jpoimboe@kernel.org>
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The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     99ee56c7657f939eecc4e8ac96e0aa0cd6ea7cbd
Gitweb:        https://git.kernel.org/tip/99ee56c7657f939eecc4e8ac96e0aa0cd6ea7cbd
Author:        Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate:    Mon, 04 Sep 2023 22:05:04 -07:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Fri, 20 Oct 2023 12:45:48 +02:00

x86/calldepth: Rename __x86_return_skl() to call_depth_return_thunk()

For consistency with the other return thunks, rename __x86_return_skl()
to call_depth_return_thunk().

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/ae44e9f9976934e3b5b47a458d523ccb15867561.1693889988.git.jpoimboe@kernel.org
---
 arch/x86/include/asm/nospec-branch.h | 13 ++++---------
 arch/x86/kernel/cpu/bugs.c           |  3 ++-
 arch/x86/lib/retpoline.S             |  4 ++--
 3 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index dcc7847..14cd3cd 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -358,12 +358,7 @@ extern void entry_ibpb(void);
 extern void (*x86_return_thunk)(void);
 
 #ifdef CONFIG_CALL_DEPTH_TRACKING
-extern void __x86_return_skl(void);
-
-static inline void x86_set_skl_return_thunk(void)
-{
-	x86_return_thunk = &__x86_return_skl;
-}
+extern void call_depth_return_thunk(void);
 
 #define CALL_DEPTH_ACCOUNT					\
 	ALTERNATIVE("",						\
@@ -376,12 +371,12 @@ DECLARE_PER_CPU(u64, __x86_ret_count);
 DECLARE_PER_CPU(u64, __x86_stuffs_count);
 DECLARE_PER_CPU(u64, __x86_ctxsw_count);
 #endif
-#else
-static inline void x86_set_skl_return_thunk(void) {}
+#else /* !CONFIG_CALL_DEPTH_TRACKING */
 
+static inline void call_depth_return_thunk(void) {}
 #define CALL_DEPTH_ACCOUNT ""
 
-#endif
+#endif /* CONFIG_CALL_DEPTH_TRACKING */
 
 #ifdef CONFIG_RETPOLINE
 
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 9731e81..016a326 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1059,7 +1059,8 @@ do_cmd_auto:
 	case RETBLEED_MITIGATION_STUFF:
 		setup_force_cpu_cap(X86_FEATURE_RETHUNK);
 		setup_force_cpu_cap(X86_FEATURE_CALL_DEPTH);
-		x86_set_skl_return_thunk();
+
+		x86_return_thunk = call_depth_return_thunk;
 		break;
 
 	default:
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 415521d..d410aba 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -323,7 +323,7 @@ __EXPORT_THUNK(entry_untrain_ret)
 #ifdef CONFIG_CALL_DEPTH_TRACKING
 
 	.align 64
-SYM_FUNC_START(__x86_return_skl)
+SYM_FUNC_START(call_depth_return_thunk)
 	ANNOTATE_NOENDBR
 	/*
 	 * Keep the hotpath in a 16byte I-fetch for the non-debug
@@ -350,7 +350,7 @@ SYM_FUNC_START(__x86_return_skl)
 	ANNOTATE_UNRET_SAFE
 	ret
 	int3
-SYM_FUNC_END(__x86_return_skl)
+SYM_FUNC_END(call_depth_return_thunk)
 
 #endif /* CONFIG_CALL_DEPTH_TRACKING */