sh: Have SH-5 provide an {en,dis}able_fpu() impl.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/ptrace_64.c

@@ -74,9 +74,9 @@ get_fpu_long(struct task_struct *task, unsigned long addr)
 	}
 
 	if (last_task_used_math == task) {
-		grab_fpu();
+		enable_fpu();
 		fpsave(&task->thread.fpu.hard);
-		release_fpu();
+		disable_fpu();
 		last_task_used_math = 0;
 		regs->sr |= SR_FD;
 	}
@@ -110,9 +110,9 @@ put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
 		fpinit(&task->thread.fpu.hard);
 		set_stopped_child_used_math(task);
 	} else if (last_task_used_math == task) {
-		grab_fpu();
+		enable_fpu();
 		fpsave(&task->thread.fpu.hard);
-		release_fpu();
+		disable_fpu();
 		last_task_used_math = 0;
 		regs->sr |= SR_FD;
 	}

arch/sh/kernel/traps_64.c

@@ -617,9 +617,9 @@ static int misaligned_fpu_load(struct pt_regs *regs,
 		   context switch the registers into memory so they can be
 		   indexed by register number. */
 		if (last_task_used_math == current) {
-			grab_fpu();
+			enable_fpu();
 			fpsave(&current->thread.fpu.hard);
-			release_fpu();
+			disable_fpu();
 			last_task_used_math = NULL;
 			regs->sr |= SR_FD;
 		}
@@ -690,9 +690,9 @@ static int misaligned_fpu_store(struct pt_regs *regs,
 		   context switch the registers into memory so they can be
 		   indexed by register number. */
 		if (last_task_used_math == current) {
-			grab_fpu();
+			enable_fpu();
 			fpsave(&current->thread.fpu.hard);
-			release_fpu();
+			disable_fpu();
 			last_task_used_math = NULL;
 			regs->sr |= SR_FD;
 		}

include/asm-sh/processor_64.h

@@ -18,6 +18,7 @@
 #include <asm/page.h>
 #include <asm/types.h>
 #include <asm/cache.h>
+#include <asm/ptrace.h>
 #include <asm/cpu/registers.h>
 
 /*
@@ -218,7 +219,7 @@ extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  * FPU lazy state save handling.
  */
 
-static inline void release_fpu(void)
+static inline void disable_fpu(void)
 {
 	unsigned long long __dummy;
 
@@ -230,7 +231,7 @@ static inline void release_fpu(void)
 			     : "r" (SR_FD));
 }
 
-static inline void grab_fpu(void)
+static inline void enable_fpu(void)
 {
 	unsigned long long __dummy;
 
@@ -242,6 +243,16 @@ static inline void grab_fpu(void)
 			     : "r" (~SR_FD));
 }
 
+static inline void release_fpu(struct pt_regs *regs)
+{
+	regs->sr |= SR_FD;
+}
+
+static inline void grab_fpu(struct pt_regs *regs)
+{
+	regs->sr &= ~SR_FD;
+}
+
 /* Round to nearest, no exceptions on inexact, overflow, underflow,
    zero-divide, invalid.  Configure option for whether to flush denorms to
    zero, or except if a denorm is encountered.  */