[PATCH 129/208] x86/fpu: Uninline kernel_fpu_begin()/end()

[Ingo Molnar]

Both inline functions call an inline function unconditionally, so we
already pay the function call based clobbering cost. Uninline them.

This saves quite a bit of code in various performance sensitive
code paths:

   text            data    bss     dec             hex     filename
   13321334        2569888 1634304 17525526        10b6b16 vmlinux.before
   13320246        2569888 1634304 17524438        10b66d6 vmlinux.after

Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/include/asm/fpu/api.h | 15 ++-------------
 arch/x86/kernel/fpu/core.c     | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h
index eeac3766d8e5..d4ab9e3af234 100644
--- a/arch/x86/include/asm/fpu/api.h
+++ b/arch/x86/include/asm/fpu/api.h
@@ -39,19 +39,8 @@ extern bool irq_fpu_usable(void);
  */
 extern void __kernel_fpu_begin(void);
 extern void __kernel_fpu_end(void);
-
-static inline void kernel_fpu_begin(void)
-{
-	preempt_disable();
-	WARN_ON_ONCE(!irq_fpu_usable());
-	__kernel_fpu_begin();
-}
-
-static inline void kernel_fpu_end(void)
-{
-	__kernel_fpu_end();
-	preempt_enable();
-}
+extern void kernel_fpu_begin(void);
+extern void kernel_fpu_end(void);
 
 /*
  * Some instructions like VIA's padlock instructions generate a spurious
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 2c47bcf63e1e..15fd714b6a83 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -125,6 +125,21 @@ void __kernel_fpu_end(void)
 }
 EXPORT_SYMBOL(__kernel_fpu_end);
 
+void kernel_fpu_begin(void)
+{
+	preempt_disable();
+	WARN_ON_ONCE(!irq_fpu_usable());
+	__kernel_fpu_begin();
+}
+EXPORT_SYMBOL_GPL(kernel_fpu_begin);
+
+void kernel_fpu_end(void)
+{
+	__kernel_fpu_end();
+	preempt_enable();
+}
+EXPORT_SYMBOL_GPL(kernel_fpu_end);
+
 static void __save_fpu(struct fpu *fpu)
 {
 	if (use_xsave()) {
-- 
2.1.0

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