linux-kernel - [RFC][PATCH 15/17] x86/cpu: Rename srso_(.*)_alias to srso_alias

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Message-ID: <20230809072201.462242259@infradead.org>
Date:   Wed, 09 Aug 2023 09:12:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        David.Kaplan@....com, Andrew.Cooper3@...rix.com,
        jpoimboe@...nel.org, gregkh@...uxfoundation.org
Subject: [RFC][PATCH 15/17] x86/cpu: Rename srso_(.*)_alias to srso_alias_\1

For a more consistent namespace.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/include/asm/nospec-branch.h |    2 +-
 arch/x86/kernel/vmlinux.lds.S        |    8 ++++----
 arch/x86/lib/retpoline.S             |   24 ++++++++++++------------
 3 files changed, 17 insertions(+), 17 deletions(-)

--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -346,7 +346,7 @@ extern void srso_alias_return_thunk(void
 
 extern void zen_untrain_ret(void);
 extern void srso_untrain_ret(void);
-extern void srso_untrain_ret_alias(void);
+extern void srso_alias_untrain_ret(void);
 
 extern void entry_untrain_ret(void);
 extern void entry_ibpb(void);
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -149,10 +149,10 @@ SECTIONS
 
 #ifdef CONFIG_CPU_UNRET_ENTRY
 		/*
-		 * See the comment above srso_untrain_ret_alias()'s
+		 * See the comment above srso_alias_untrain_ret()'s
 		 * definition.
 		 */
-		. = srso_untrain_ret_alias | (1 << 2) | (1 << 8) | (1 << 14) | (1 << 20);
+		. = srso_alias_untrain_ret | (1 << 2) | (1 << 8) | (1 << 14) | (1 << 20);
 		*(.text.__x86.rethunk_safe)
 #endif
 		ALIGN_ENTRY_TEXT_END
@@ -529,8 +529,8 @@ INIT_PER_CPU(irq_stack_backing_store);
  * GNU ld cannot do XOR so do: (A | B) - (A & B) in order to compute the XOR
  * of the two function addresses:
  */
-. = ASSERT(((srso_untrain_ret_alias | srso_safe_ret_alias) -
-		(srso_untrain_ret_alias & srso_safe_ret_alias)) == ((1 << 2) | (1 << 8) | (1 << 14) | (1 << 20)),
+. = ASSERT(((srso_alias_untrain_ret | srso_alias_safe_ret) -
+	    (srso_alias_untrain_ret & srso_alias_safe_ret)) == ((1 << 2) | (1 << 8) | (1 << 14) | (1 << 20)),
 		"SRSO function pair won't alias");
 #endif
 
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -134,41 +134,41 @@ SYM_CODE_END(__x86_indirect_jump_thunk_a
 
 #ifdef CONFIG_CPU_UNRET_ENTRY
 /*
- * srso_untrain_ret_alias() and srso_safe_ret_alias() are placed at
+ * srso_alias_untrain_ret() and srso_alias_safe_ret() are placed at
  * special addresses:
  *
- * - srso_untrain_ret_alias() is 2M aligned
- * - srso_safe_ret_alias() is also in the same 2M page but bits 2, 8, 14
+ * - srso_alias_untrain_ret() is 2M aligned
+ * - srso_alias_safe_ret() is also in the same 2M page but bits 2, 8, 14
  * and 20 in its virtual address are set (while those bits in the
- * srso_untrain_ret_alias() function are cleared).
+ * srso_alias_untrain_ret() function are cleared).
  *
  * This guarantees that those two addresses will alias in the branch
  * target buffer of Zen3/4 generations, leading to any potential
  * poisoned entries at that BTB slot to get evicted.
  *
- * As a result, srso_safe_ret_alias() becomes a safe return.
+ * As a result, srso_alias_safe_ret() becomes a safe return.
  */
 	.section .text.__x86.rethunk_untrain
 
-SYM_START(srso_untrain_ret_alias, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_alias_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
 	ASM_NOP2
 	lfence
 	jmp srso_alias_return_thunk
-SYM_FUNC_END(srso_untrain_ret_alias)
-__EXPORT_THUNK(srso_untrain_ret_alias)
+SYM_FUNC_END(srso_alias_untrain_ret)
+__EXPORT_THUNK(srso_alias_untrain_ret)
 
 	.section .text.__x86.rethunk_safe
 
 /* Needs a definition for the zen_return_thunk alternative below. */
-SYM_START(srso_safe_ret_alias, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_alias_safe_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	add $8, %_ASM_SP
 	UNWIND_HINT_FUNC
 	ANNOTATE_UNRET_SAFE
 	ret
 	int3
-SYM_FUNC_END(srso_safe_ret_alias)
+SYM_FUNC_END(srso_alias_safe_ret)
 
 	.section .text.__x86.return_thunk
 
@@ -266,7 +266,7 @@ __EXPORT_THUNK(srso_untrain_ret)
 SYM_FUNC_START(entry_untrain_ret)
 	ALTERNATIVE_2 "jmp zen_untrain_ret", \
 		      "jmp srso_untrain_ret", X86_FEATURE_SRSO, \
-		      "jmp srso_untrain_ret_alias", X86_FEATURE_SRSO_ALIAS
+		      "jmp srso_alias_untrain_ret", X86_FEATURE_SRSO_ALIAS
 SYM_FUNC_END(entry_untrain_ret)
 __EXPORT_THUNK(entry_untrain_ret)
 
@@ -284,7 +284,7 @@ SYM_CODE_END(srso_return_thunk)
 SYM_CODE_START(srso_alias_return_thunk)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
-	call srso_safe_ret_alias
+	call srso_alias_safe_ret
 	ud2
 SYM_CODE_END(srso_alias_return_thunk)