Commit f3856cd3 authored Mar 03, 2025 by Brian Gerst Committed by Ingo Molnar Mar 04, 2025

x86/stackprotector: Move __stack_chk_guard to percpu hot section



No functional change.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250303165246.2175811-11-brgerst@gmail.com

parent a1e4cc01

arch/x86/include/asm/stackprotector.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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.

arch/x86/kernel/cpu/common.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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