linux-kernel - [PATCH v2 2/4] x86/acpi/suspend: Remove segment reloads on resume

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Message-ID: <20260203175821.511847-3-brgerst@gmail.com>
Date: Tue,  3 Feb 2026 12:58:19 -0500
From: Brian Gerst <brgerst@...il.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Ard Biesheuvel <ardb@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Pavel Machek <pavel@...nel.org>,
	Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 2/4] x86/acpi/suspend: Remove segment reloads on resume

common_startup_64() has set the segments to usable values already, and
they will be restored later in restore_processor_state().  Remove the
redundant segment loads in wakeup_long64()..

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/kernel/acpi/wakeup_64.S | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index 3d56610f0108..099401ef2ea4 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -28,12 +28,6 @@ SYM_FUNC_START(wakeup_long64)
 1:
 	jmp 1b
 2:
-	movw	$__KERNEL_DS, %ax
-	movw	%ax, %ss	
-	movw	%ax, %ds
-	movw	%ax, %es
-	movw	%ax, %fs
-	movw	%ax, %gs
 	movq	saved_rsp(%rip), %rsp
 
 	movq	saved_rbx(%rip), %rbx
-- 
2.52.0