x86/fpu: Harmonize the names of the fpstate_init() helper functions

Harmonize the inconsistent naming of these related functions:

                          fpstate_init()
  finit_soft_fpu()   =>   fpstate_init_fsoft()
  fx_finit()         =>   fpstate_init_fxstate()
  fx_finit()         =>   fpstate_init_fstate()       # split out

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/fpu/internal.h

@@ -28,7 +28,18 @@ extern void fpu__init_cpu_xstate(void);
 extern void fpu__init_system(struct cpuinfo_x86 *c);
 
 extern void fpu__activate_curr(struct fpu *fpu);
+
 extern void fpstate_init(struct fpu *fpu);
+#ifdef CONFIG_MATH_EMULATION
+extern void fpstate_init_soft(struct i387_soft_struct *soft);
+#else
+static inline void fpstate_init_soft(struct i387_soft_struct *soft) {}
+#endif
+static inline void fpstate_init_fxstate(struct i387_fxsave_struct *fx)
+{
+	fx->cwd = 0x37f;
+	fx->mxcsr = MXCSR_DEFAULT;
+}
 
 extern int  dump_fpu(struct pt_regs *, struct user_i387_struct *);
 extern int  fpu__exception_code(struct fpu *fpu, int trap_nr);
@@ -48,12 +59,6 @@ extern void fpu__resume_cpu(void);
 
 DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
-#ifdef CONFIG_MATH_EMULATION
-extern void finit_soft_fpu(struct i387_soft_struct *soft);
-#else
-static inline void finit_soft_fpu(struct i387_soft_struct *soft) {}
-#endif
-
 /*
  * Must be run with preemption disabled: this clears the fpu_fpregs_owner_ctx,
  * on this CPU.
@@ -93,12 +98,6 @@ static __always_inline __pure bool use_fxsr(void)
 	return static_cpu_has_safe(X86_FEATURE_FXSR);
 }
 
-static inline void fx_finit(struct i387_fxsave_struct *fx)
-{
-	fx->cwd = 0x37f;
-	fx->mxcsr = MXCSR_DEFAULT;
-}
-
 extern void fpstate_sanitize_xstate(struct fpu *fpu);
 
 #define user_insn(insn, output, input...)				\

arch/x86/kernel/fpu/core.c

@@ -191,24 +191,30 @@ void fpu__save(struct fpu *fpu)
 }
 EXPORT_SYMBOL_GPL(fpu__save);
 
+/*
+ * Legacy x87 fpstate state init:
+ */
+static inline void fpstate_init_fstate(struct i387_fsave_struct *fp)
+{
+	fp->cwd = 0xffff037fu;
+	fp->swd = 0xffff0000u;
+	fp->twd = 0xffffffffu;
+	fp->fos = 0xffff0000u;
+}
+
 void fpstate_init(struct fpu *fpu)
 {
 	if (!cpu_has_fpu) {
-		finit_soft_fpu(&fpu->state.soft);
+		fpstate_init_soft(&fpu->state.soft);
 		return;
 	}
 
 	memset(&fpu->state, 0, xstate_size);
 
-	if (cpu_has_fxsr) {
-		fx_finit(&fpu->state.fxsave);
-	} else {
-		struct i387_fsave_struct *fp = &fpu->state.fsave;
-		fp->cwd = 0xffff037fu;
-		fp->swd = 0xffff0000u;
-		fp->twd = 0xffffffffu;
-		fp->fos = 0xffff0000u;
-	}
+	if (cpu_has_fxsr)
+		fpstate_init_fxstate(&fpu->state.fxsave);
+	else
+		fpstate_init_fstate(&fpu->state.fsave);
 }
 EXPORT_SYMBOL_GPL(fpstate_init);
 

arch/x86/kernel/fpu/init.c

@@ -121,7 +121,7 @@ static void fpu__init_system_generic(void)
 	 * Set up the legacy init FPU context. (xstate init might overwrite this
 	 * with a more modern format, if the CPU supports it.)
 	 */
-	fx_finit(&init_xstate_ctx.i387);
+	fpstate_init_fxstate(&init_xstate_ctx.i387);
 
 	fpu__init_system_mxcsr();
 }

arch/x86/math-emu/fpu_aux.c

@@ -30,7 +30,7 @@ static void fclex(void)
 }
 
 /* Needs to be externally visible */
-void finit_soft_fpu(struct i387_soft_struct *soft)
+void fpstate_init_soft(struct i387_soft_struct *soft)
 {
 	struct address *oaddr, *iaddr;
 	memset(soft, 0, sizeof(*soft));
@@ -52,7 +52,7 @@ void finit_soft_fpu(struct i387_soft_struct *soft)
 
 void finit(void)
 {
-	finit_soft_fpu(&current->thread.fpu.state.soft);
+	fpstate_init_soft(&current->thread.fpu.state.soft);
 }
 
 /*