linux-kernel - [tip: x86/core] x86/stackprotector: Move __stack_chk

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Message-ID: <174108458932.14745.2033752798104198399.tip-bot2@tip-bot2>
Date: Tue, 04 Mar 2025 10:36:29 -0000
From: "tip-bot2 for Brian Gerst" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Brian Gerst <brgerst@...il.com>, Ingo Molnar <mingo@...nel.org>,
 Uros Bizjak <ubizjak@...il.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/stackprotector: Move __stack_chk_guard to percpu
 hot section

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

Commit-ID:     f9bf822a1642aedb986b1a7dbdfa658de999b7c6
Gitweb:        https://git.kernel.org/tip/f9bf822a1642aedb986b1a7dbdfa658de999b7c6
Author:        Brian Gerst <brgerst@...il.com>
AuthorDate:    Mon, 03 Mar 2025 11:52:45 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 04 Mar 2025 11:24:29 +01:00

x86/stackprotector: Move __stack_chk_guard to percpu hot section

No functional change.

Signed-off-by: Brian Gerst <brgerst@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Uros Bizjak <ubizjak@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/20250303165246.2175811-11-brgerst@gmail.com
---
 arch/x86/include/asm/stackprotector.h | 2 +-
 arch/x86/kernel/cpu/common.c          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
index d43fb58..cd761b1 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -20,7 +20,7 @@
 
 #include <linux/sched.h>
 
-DECLARE_PER_CPU(unsigned long, __stack_chk_guard);
+DECLARE_PER_CPU_CACHE_HOT(unsigned long, __stack_chk_guard);
 
 /*
  * Initialize the stackprotector canary value.
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 3f45fdd..5809534 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2147,7 +2147,7 @@ void syscall_init(void)
 #endif /* CONFIG_X86_64 */
 
 #ifdef CONFIG_STACKPROTECTOR
-DEFINE_PER_CPU(unsigned long, __stack_chk_guard);
+DEFINE_PER_CPU_CACHE_HOT(unsigned long, __stack_chk_guard);
 #ifndef CONFIG_SMP
 EXPORT_PER_CPU_SYMBOL(__stack_chk_guard);
 #endif