linux-kernel - [patch 2/3] x86/fpu: Rename irq_fpu

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Date:   Sun,  1 May 2022 21:31:45 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Filipe Manana <fdmanana@...e.com>
Subject: [patch 2/3] x86/fpu: Rename irq_fpu_usable()

This can be invoked from almost any context, except NMI. The only
requirement is that the context is not migrateable.

Rename it to kernel_fpu_usable().

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/um/include/asm/fpu/api.h       |    2 +-
 arch/x86/include/asm/fpu/api.h      |    4 ++--
 arch/x86/include/asm/simd.h         |    2 +-
 arch/x86/kernel/fpu/core.c          |   13 +++++++------
 net/netfilter/nft_set_pipapo_avx2.c |    2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

--- a/arch/um/include/asm/fpu/api.h
+++ b/arch/um/include/asm/fpu/api.h
@@ -11,7 +11,7 @@
 #define kernel_fpu_begin() (void)0
 #define kernel_fpu_end() (void)0
 
-static inline bool irq_fpu_usable(void)
+static inline bool kernel_fpu_usable(void)
 {
 	return true;
 }
--- a/arch/x86/include/asm/fpu/api.h
+++ b/arch/x86/include/asm/fpu/api.h
@@ -19,7 +19,7 @@
  * disables preemption so be careful if you intend to use it for long periods
  * of time.
  * If you intend to use the FPU in irq/softirq you need to check first with
- * irq_fpu_usable() if it is possible.
+ * kernel_fpu_usable() if it is possible.
  */
 
 /* Kernel FPU states to initialize in kernel_fpu_begin_mask() */
@@ -28,7 +28,7 @@
 
 extern void kernel_fpu_begin_mask(unsigned int kfpu_mask);
 extern void kernel_fpu_end(void);
-extern bool irq_fpu_usable(void);
+extern bool kernel_fpu_usable(void);
 extern void fpregs_mark_activate(void);
 
 /* Code that is unaware of kernel_fpu_begin_mask() can use this */
--- a/arch/x86/include/asm/simd.h
+++ b/arch/x86/include/asm/simd.h
@@ -8,5 +8,5 @@
  */
 static __must_check inline bool may_use_simd(void)
 {
-	return irq_fpu_usable();
+	return kernel_fpu_usable();
 }
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -49,11 +49,12 @@ static DEFINE_PER_CPU(bool, in_kernel_fp
  */
 DEFINE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
-/*
- * Can we use the FPU in kernel mode with the
- * whole "kernel_fpu_begin/end()" sequence?
+/**
+ * kernel_fpu_usable - Check whether kernel FPU usage is possible
+ *
+ * Has to be invoked before calling kernel_fpu_begin().
  */
-bool irq_fpu_usable(void)
+bool kernel_fpu_usable(void)
 {
 	if (WARN_ON_ONCE(in_nmi()))
 		return false;
@@ -81,7 +82,7 @@ bool irq_fpu_usable(void)
 	 */
 	return !softirq_count();
 }
-EXPORT_SYMBOL(irq_fpu_usable);
+EXPORT_SYMBOL(kernel_fpu_usable);
 
 /*
  * Track AVX512 state use because it is known to slow the max clock
@@ -409,7 +410,7 @@ void kernel_fpu_begin_mask(unsigned int
 {
 	preempt_disable();
 
-	WARN_ON_FPU(!irq_fpu_usable());
+	WARN_ON_FPU(!kernel_fpu_usable());
 	WARN_ON_FPU(this_cpu_read(in_kernel_fpu));
 
 	this_cpu_write(in_kernel_fpu, true);
--- a/net/netfilter/nft_set_pipapo_avx2.c
+++ b/net/netfilter/nft_set_pipapo_avx2.c
@@ -1128,7 +1128,7 @@ bool nft_pipapo_avx2_lookup(const struct
 	bool map_index;
 	int i, ret = 0;
 
-	if (unlikely(!irq_fpu_usable()))
+	if (unlikely(!kernel_fpu_usable()))
 		return nft_pipapo_lookup(net, set, key, ext);
 
 	m = rcu_dereference(priv->match);