x86/fpu: Factor out fpu/regset.h from fpu/internal.h

Only a few places use the regset definitions, so factor them out.

Also fix related header dependency assumptions.

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

@@ -10,7 +10,6 @@
 #ifndef _ASM_X86_FPU_INTERNAL_H
 #define _ASM_X86_FPU_INTERNAL_H
 
-#include <linux/regset.h>
 #include <linux/compat.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -48,18 +47,6 @@ extern void fpu__resume_cpu(void);
 
 DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
-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;
-extern user_regset_set_fn fpregs_set, xfpregs_set, fpregs_soft_set,
-				 xstateregs_set;
-
-/*
- * xstateregs_active == regset_fpregs_active. Please refer to the comment
- * at the definition of regset_fpregs_active.
- */
-#define xstateregs_active	regset_fpregs_active
-
 #ifdef CONFIG_MATH_EMULATION
 extern void finit_soft_fpu(struct i387_soft_struct *soft);
 #else

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

@@ -0,0 +1,21 @@
+/*
+ * FPU regset handling methods:
+ */
+#ifndef _ASM_X86_FPU_REGSET_H
+#define _ASM_X86_FPU_REGSET_H
+
+#include <linux/regset.h>
+
+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;
+extern user_regset_set_fn fpregs_set, xfpregs_set, fpregs_soft_set,
+				 xstateregs_set;
+
+/*
+ * xstateregs_active == regset_fpregs_active. Please refer to the comment
+ * at the definition of regset_fpregs_active.
+ */
+#define xstateregs_active	regset_fpregs_active
+
+#endif /* _ASM_X86_FPU_REGSET_H */

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

@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <asm/processor.h>
+#include <linux/uaccess.h>
 
 /* Bit 63 of XCR0 is reserved for future expansion */
 #define XSTATE_EXTEND_MASK	(~(XSTATE_FPSSE | (1ULL << 63)))

arch/x86/kernel/fpu/core.c

@@ -6,6 +6,7 @@
  *	Gareth Hughes <gareth@valinux.com>, May 2000
  */
 #include <asm/fpu/internal.h>
+#include <asm/fpu/regset.h>
 #include <asm/fpu/signal.h>
 
 #include <linux/hardirq.h>

arch/x86/kernel/fpu/xstate.c

@@ -5,9 +5,11 @@
  */
 #include <linux/compat.h>
 #include <linux/cpu.h>
+
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>
 #include <asm/fpu/signal.h>
+#include <asm/fpu/regset.h>
 #include <asm/sigframe.h>
 #include <asm/tlbflush.h>
 

arch/x86/kernel/ptrace.c

@@ -11,7 +11,6 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/ptrace.h>
-#include <linux/regset.h>
 #include <linux/tracehook.h>
 #include <linux/user.h>
 #include <linux/elf.h>
@@ -30,6 +29,7 @@
 #include <asm/processor.h>
 #include <asm/fpu/internal.h>
 #include <asm/fpu/signal.h>
+#include <asm/fpu/regset.h>
 #include <asm/debugreg.h>
 #include <asm/ldt.h>
 #include <asm/desc.h>