From e8ee6e81252850255cffc982e9867d48207ed659 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Wed, 6 Apr 2022 14:18:09 -0700
Subject: [PATCH] Remove unused ring0.RestoreKernelFPState.

PiperOrigin-RevId: 439933401
---
 pkg/ring0/kernel_amd64.go | 18 ------------------
 pkg/ring0/kernel_arm64.go |  6 ------
 2 files changed, 24 deletions(-)

diff --git a/pkg/ring0/kernel_amd64.go b/pkg/ring0/kernel_amd64.go
index e2e9f88c0..0f90d3a2d 100644
--- a/pkg/ring0/kernel_amd64.go
+++ b/pkg/ring0/kernel_amd64.go
@@ -338,21 +338,3 @@ func SetCPUIDFaulting(on bool) bool {
 func ReadCR2() uintptr {
 	return readCR2()
 }
-
-// kernelMXCSR is the value of the mxcsr register in the Sentry.
-//
-// The MXCSR control configuration is initialized once and never changed. Look
-// at src/cmd/compile/abi-internal.md in the golang sources for more details.
-var kernelMXCSR uint32
-
-// RestoreKernelFPState restores the Sentry floating point state.
-//
-//go:nosplit
-func RestoreKernelFPState() {
-	// Restore the MXCSR control configuration.
-	ldmxcsr(&kernelMXCSR)
-}
-
-func init() {
-	stmxcsr(&kernelMXCSR)
-}
diff --git a/pkg/ring0/kernel_arm64.go b/pkg/ring0/kernel_arm64.go
index 79f85ff50..889150589 100644
--- a/pkg/ring0/kernel_arm64.go
+++ b/pkg/ring0/kernel_arm64.go
@@ -90,9 +90,3 @@ func (c *CPU) SwitchToUser(switchOpts SwitchOpts) (vector Vector) {
 
 	return
 }
-
-// RestoreKernelFPState restores the Sentry floating point state.
-//
-//go:nosplit
-func RestoreKernelFPState() {
-}