x86/fpu: Split out fpu/signal.h from fpu/internal.h for signal frame handling functions

Most of the FPU does not use them, so split it out and include
them in signal.c and ia32_signal.c

Also fix header file dependency assumption in fpu/core.c.

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/ia32/ia32_signal.c

@@ -22,6 +22,7 @@
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
 #include <asm/ptrace.h>
 #include <asm/ia32_unistd.h>
 #include <asm/user32.h>

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

@@ -19,21 +19,6 @@
 #include <asm/fpu/api.h>
 #include <asm/fpu/xstate.h>
 
-#ifdef CONFIG_X86_64
-# include <asm/sigcontext32.h>
-# include <asm/user32.h>
-struct ksignal;
-int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
-			compat_sigset_t *set, struct pt_regs *regs);
-int ia32_setup_frame(int sig, struct ksignal *ksig,
-		     compat_sigset_t *set, struct pt_regs *regs);
-#else
-# define user_i387_ia32_struct	user_i387_struct
-# define user32_fxsr_struct	user_fxsr_struct
-# define ia32_setup_frame	__setup_frame
-# define ia32_setup_rt_frame	__setup_rt_frame
-#endif
-
 #define	MXCSR_DEFAULT		0x1f80
 
 extern unsigned int mxcsr_feature_mask;
@@ -63,11 +48,6 @@ extern void fpu__resume_cpu(void);
 
 DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
-extern void convert_from_fxsr(struct user_i387_ia32_struct *env,
-			      struct task_struct *tsk);
-extern void convert_to_fxsr(struct task_struct *tsk,
-			    const struct user_i387_ia32_struct *env);
-
 extern user_regset_active_fn regset_fpregs_active, regset_xregset_fpregs_active;
 extern user_regset_get_fn fpregs_get, xfpregs_get, fpregs_soft_get,
 				xstateregs_get;
@@ -530,8 +510,4 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
 	}
 }
 
-unsigned long
-fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
-		     unsigned long *buf_fx, unsigned long *size);
-
 #endif /* _ASM_X86_FPU_INTERNAL_H */

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

@@ -0,0 +1,31 @@
+/*
+ * x86 FPU signal frame handling methods:
+ */
+#ifndef _ASM_X86_FPU_SIGNAL_H
+#define _ASM_X86_FPU_SIGNAL_H
+
+#ifdef CONFIG_X86_64
+# include <asm/sigcontext32.h>
+# include <asm/user32.h>
+struct ksignal;
+int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
+			compat_sigset_t *set, struct pt_regs *regs);
+int ia32_setup_frame(int sig, struct ksignal *ksig,
+		     compat_sigset_t *set, struct pt_regs *regs);
+#else
+# define user_i387_ia32_struct	user_i387_struct
+# define user32_fxsr_struct	user_fxsr_struct
+# define ia32_setup_frame	__setup_frame
+# define ia32_setup_rt_frame	__setup_rt_frame
+#endif
+
+extern void convert_from_fxsr(struct user_i387_ia32_struct *env,
+			      struct task_struct *tsk);
+extern void convert_to_fxsr(struct task_struct *tsk,
+			    const struct user_i387_ia32_struct *env);
+
+unsigned long
+fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
+		     unsigned long *buf_fx, unsigned long *size);
+
+#endif /* _ASM_X86_FPU_SIGNAL_H */

arch/x86/kernel/fpu/core.c

@@ -6,6 +6,8 @@
  *	Gareth Hughes <gareth@valinux.com>, May 2000
  */
 #include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
+
 #include <linux/hardirq.h>
 
 /*

arch/x86/kernel/fpu/xstate.c

@@ -7,6 +7,7 @@
 #include <linux/cpu.h>
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
 #include <asm/sigframe.h>
 #include <asm/tlbflush.h>
 

arch/x86/kernel/ptrace.c

@@ -29,6 +29,7 @@
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
 #include <asm/debugreg.h>
 #include <asm/ldt.h>
 #include <asm/desc.h>

arch/x86/kernel/signal.c

@@ -27,6 +27,7 @@
 #include <asm/processor.h>
 #include <asm/ucontext.h>
 #include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
 #include <asm/vdso.h>
 #include <asm/mce.h>
 #include <asm/sighandling.h>