linux-kernel - [patch 19/31] x86/fpu: Clean up cpu feature tests

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Date:   Tue, 12 Oct 2021 02:00:27 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Chang S. Bae" <chang.seok.bae@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Subject: [patch 19/31] x86/fpu: Clean up cpu feature tests

Further disintegration of internal.h:

Move the cpu feature tests to a core header and remove the unused one.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/fpu/internal.h |   18 ------------------
 arch/x86/kernel/fpu/core.c          |    1 +
 arch/x86/kernel/fpu/internal.h      |   11 +++++++++++
 arch/x86/kernel/fpu/regset.c        |    2 ++
 4 files changed, 14 insertions(+), 18 deletions(-)

--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -51,24 +51,6 @@ extern void fpu__resume_cpu(void);
 # define WARN_ON_FPU(x) ({ (void)(x); 0; })
 #endif
 
-/*
- * FPU related CPU feature flag helper routines:
- */
-static __always_inline __pure bool use_xsaveopt(void)
-{
-	return static_cpu_has(X86_FEATURE_XSAVEOPT);
-}
-
-static __always_inline __pure bool use_xsave(void)
-{
-	return static_cpu_has(X86_FEATURE_XSAVE);
-}
-
-static __always_inline __pure bool use_fxsr(void)
-{
-	return static_cpu_has(X86_FEATURE_FXSR);
-}
-
 extern union fpregs_state init_fpstate;
 extern void fpstate_init_user(union fpregs_state *state);
 
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -17,6 +17,7 @@
 #include <linux/hardirq.h>
 #include <linux/pkeys.h>
 
+#include "internal.h"
 #include "xstate.h"
 
 #define CREATE_TRACE_POINTS
--- a/arch/x86/kernel/fpu/internal.h
+++ b/arch/x86/kernel/fpu/internal.h
@@ -2,6 +2,17 @@
 #ifndef __X86_KERNEL_FPU_INTERNAL_H
 #define __X86_KERNEL_FPU_INTERNAL_H
 
+/* CPU feature check wrappers */
+static __always_inline __pure bool use_xsave(void)
+{
+	return cpu_feature_enabled(X86_FEATURE_XSAVE);
+}
+
+static __always_inline __pure bool use_fxsr(void)
+{
+	return cpu_feature_enabled(X86_FEATURE_FXSR);
+}
+
 /* Init functions */
 extern void fpu__init_prepare_fx_sw_frame(void);
 
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -10,6 +10,8 @@
 #include <asm/fpu/regset.h>
 #include <asm/fpu/xstate.h>
 
+#include "internal.h"
+
 /*
  * The xstateregs_active() routine is the same as the regset_fpregs_active() routine,
  * as the "regset->n" for the xstate regset will be updated based on the feature