[PATCH 11/29] x86/fpu: Always init the `state' in fpu__clear()

[Sebastian Andrzej Siewior]

fpu__clear() only initializes the `state' if the FPU is present. This
initialisation is also required for the FPU-less system and takes place
math_emulate(). Since fpu__initialize() only performs the initialization
if ->initialized is zero it does not matter that it is invoked each time
an opcode is emulated. It makes the removal of ->initialized easier if
the struct is also initialized in FPU-less case at the same time.

Move fpu__initialize() before the FPU check so it is also performed in
FPU-less case.

Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 arch/x86/include/asm/fpu/internal.h | 1 -
 arch/x86/kernel/fpu/core.c          | 5 ++---
 arch/x86/math-emu/fpu_entry.c       | 3 ---
 3 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/fpu/internal.h 
b/arch/x86/include/asm/fpu/internal.h
index 415d43bdaaa76..1d0e043bfc447 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -24,7 +24,6 @@
 /*
  * High level FPU state handling functions:
  */
-extern void fpu__initialize(struct fpu *fpu);
 extern void fpu__prepare_read(struct fpu *fpu);
 extern void fpu__prepare_write(struct fpu *fpu);
 extern void fpu__save(struct fpu *fpu);
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 1940319268aef..e43296854e379 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -223,7 +223,7 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
  * Activate the current task's in-memory FPU context,
  * if it has not been used before:
  */
-void fpu__initialize(struct fpu *fpu)
+static void fpu__initialize(struct fpu *fpu)
 {
        WARN_ON_FPU(fpu != &current->thread.fpu);
 
@@ -236,7 +236,6 @@ void fpu__initialize(struct fpu *fpu)
                fpu->initialized = 1;
        }
 }
-EXPORT_SYMBOL_GPL(fpu__initialize);
 
 /*
  * This function must be called before we read a task's fpstate.
@@ -365,8 +364,8 @@ void fpu__clear(struct fpu *fpu)
        /*
         * Make sure fpstate is cleared and initialized.
         */
+       fpu__initialize(fpu);
        if (static_cpu_has(X86_FEATURE_FPU)) {
-               fpu__initialize(fpu);
                user_fpu_begin();
                copy_init_fpstate_to_fpregs();
        }
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 9e2ba7e667f61..a873da6b46d6b 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -113,9 +113,6 @@ void math_emulate(struct math_emu_info *info)
        unsigned long code_base = 0;
        unsigned long code_limit = 0;   /* Initialized to stop compiler 
warnings */
        struct desc_struct code_descriptor;
-       struct fpu *fpu = &current->thread.fpu;
-
-       fpu__initialize(fpu);
 
 #ifdef RE_ENTRANT_CHECKING
        if (emulating) {
-- 
2.20.0.rc1