linux-kernel - [tip: x86/asm] x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG

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Message-ID: <174178075738.14745.15433710467224904900.tip-bot2@tip-bot2>
Date: Wed, 12 Mar 2025 11:59:17 -0000
From: "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, Brian Gerst <brgerst@...il.com>,
 Ard Biesheuvel <ardb@...nel.org>, Uros Bizjak <ubizjak@...il.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/asm] x86/stackprotector/64: Only export
 __ref_stack_chk_guard on CONFIG_SMP

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

Commit-ID:     c0560fbaab0dab0afbdb3e339b3cb61ef8d3115e
Gitweb:        https://git.kernel.org/tip/c0560fbaab0dab0afbdb3e339b3cb61ef8d3115e
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 12 Mar 2025 12:48:49 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 12 Mar 2025 12:51:35 +01:00

x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG_SMP

The __ref_stack_chk_guard symbol doesn't exist on UP:

  <stdin>:4:15: error: ‘__ref_stack_chk_guard’ undeclared here (not in a function)

Fix the #ifdef around the entry.S export.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Uros Bizjak <ubizjak@...il.com>
Link: https://lore.kernel.org/r/20250123190747.745588-8-brgerst@gmail.com
---
 arch/x86/entry/entry.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/entry.S b/arch/x86/entry/entry.S
index fe5344a..35a91cf 100644
--- a/arch/x86/entry/entry.S
+++ b/arch/x86/entry/entry.S
@@ -62,6 +62,6 @@ THUNK warn_thunk_thunk, __warn_thunk
  * entirely in the C code, and use an alias emitted by the linker script
  * instead.
  */
-#ifdef CONFIG_STACKPROTECTOR
+#if defined(CONFIG_STACKPROTECTOR) && defined(CONFIG_SMP)
 EXPORT_SYMBOL(__ref_stack_chk_guard);
 #endif