linux-kernel - [PATCH 2/3] x86/fpu: Simplify kernel_fpu

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Message-Id: <20190604071524.12835-3-hch@lst.de>
Date:   Tue,  4 Jun 2019 09:15:23 +0200
From:   Christoph Hellwig <hch@....de>
To:     x86@...nel.org
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] x86/fpu: Simplify kernel_fpu_begin

Merge two helpers into the main function, remove a pointless local
variable and flatten a conditional.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/x86/kernel/fpu/core.c | 35 +++++++++++------------------------
 1 file changed, 11 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 1d09af1158e1..03c2d306e6f2 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -43,12 +43,6 @@ static DEFINE_PER_CPU(bool, in_kernel_fpu);
  */
 DEFINE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
-static void kernel_fpu_disable(void)
-{
-	WARN_ON_FPU(this_cpu_read(in_kernel_fpu));
-	this_cpu_write(in_kernel_fpu, true);
-}
-
 static bool kernel_fpu_disabled(void)
 {
 	return this_cpu_read(in_kernel_fpu);
@@ -88,32 +82,25 @@ bool irq_fpu_usable(void)
 }
 EXPORT_SYMBOL(irq_fpu_usable);
 
-static void __kernel_fpu_begin(void)
+void kernel_fpu_begin(void)
 {
-	struct fpu *fpu = &current->thread.fpu;
+	preempt_disable();
 
 	WARN_ON_FPU(!irq_fpu_usable());
+	WARN_ON_FPU(this_cpu_read(in_kernel_fpu));
 
-	kernel_fpu_disable();
+	this_cpu_write(in_kernel_fpu, true);
 
-	if (current->mm) {
-		if (!test_thread_flag(TIF_NEED_FPU_LOAD)) {
-			set_thread_flag(TIF_NEED_FPU_LOAD);
-			/*
-			 * Ignore return value -- we don't care if reg state
-			 * is clobbered.
-			 */
-			copy_fpregs_to_fpstate(fpu);
-		}
+	if (current->mm && !test_thread_flag(TIF_NEED_FPU_LOAD)) {
+		set_thread_flag(TIF_NEED_FPU_LOAD);
+		/*
+		 * Ignore return value -- we don't care if reg state
+		 * is clobbered.
+		 */
+		copy_fpregs_to_fpstate(&current->thread.fpu);
 	}
 	__cpu_invalidate_fpregs_state();
 }
-
-void kernel_fpu_begin(void)
-{
-	preempt_disable();
-	__kernel_fpu_begin();
-}
 EXPORT_SYMBOL_GPL(kernel_fpu_begin);
 
 void kernel_fpu_end(void)
-- 
2.20.1