sparc64: take fprs_write() and friends to start_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/include/asm/processor_64.h

@@ -94,6 +94,7 @@ struct thread_struct {
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
+#include <asm/fpumacro.h>
 
 /* Return saved PC of a blocked thread. */
 struct task_struct;
@@ -143,6 +144,10 @@ do { \
 	: \
 	: "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 	  "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
+	fprs_write(0);	\
+	current_thread_info()->xfsr[0] = 0;	\
+	current_thread_info()->fpsaved[0] = 0;	\
+	regs->tstate &= ~TSTATE_PEF;	\
 } while (0)
 
 #define start_thread32(regs, pc, sp) \
@@ -183,6 +188,10 @@ do { \
 	: \
 	: "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
 	  "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
+	fprs_write(0);	\
+	current_thread_info()->xfsr[0] = 0;	\
+	current_thread_info()->fpsaved[0] = 0;	\
+	regs->tstate &= ~TSTATE_PEF;	\
 } while (0)
 
 /* Free all resources held by a thread. */

arch/sparc/kernel/process_64.c

@@ -692,12 +692,6 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
 			  (const char __user *const __user *)
 			  regs->u_regs[base + UREG_I2], regs);
 	putname(filename);
-	if (!error) {
-		fprs_write(0);
-		current_thread_info()->xfsr[0] = 0;
-		current_thread_info()->fpsaved[0] = 0;
-		regs->tstate &= ~TSTATE_PEF;
-	}
 out:
 	return error;
 }

arch/sparc/kernel/sys_sparc32.c

@@ -421,13 +421,6 @@ asmlinkage long sparc32_execve(struct pt_regs *regs)
 				 compat_ptr(regs->u_regs[base + UREG_I2]), regs);
 
 	putname(filename);
-
-	if (!error) {
-		fprs_write(0);
-		current_thread_info()->xfsr[0] = 0;
-		current_thread_info()->fpsaved[0] = 0;
-		regs->tstate &= ~TSTATE_PEF;
-	}
 out:
 	return error;
 }