ppc64: Be sure to zero the fpscr in a signal handler, otherwise

we take a SIGFPE as soon as the signal handler tries to do any FP.

arch/ppc64/kernel/signal.c

@@ -318,6 +318,7 @@ setup_rt_frame(struct pt_regs *regs, struct sigregs *frame,
 		goto badframe;
 	flush_icache_range((unsigned long) &frame->tramp[0],
 			   (unsigned long) &frame->tramp[2]);
+	current->thread.fpscr = 0;	/* turn off all fp exceptions */
 
 	/* Retrieve rt_sigframe from stack and
 	   set up registers for signal handler
@@ -435,6 +436,7 @@ setup_frame(struct pt_regs *regs, struct sigregs *frame,
 		goto badframe;
 	flush_icache_range((unsigned long) &frame->tramp[0],
 			   (unsigned long) &frame->tramp[2]);
+	current->thread.fpscr = 0;	/* turn off all fp exceptions */
 
 	newsp -= __SIGNAL_FRAMESIZE;
 	if ( get_user(temp_ptr, &sc->handler))

arch/ppc64/kernel/signal32.c

@@ -448,6 +448,7 @@ setup_frame32(struct pt_regs *regs, struct sigregs32 *frame,
 
 	flush_icache_range((unsigned long) &frame->tramp[0],
 			   (unsigned long) &frame->tramp[2]);
+	current->thread.fpscr = 0;	/* turn off all fp exceptions */
 
 	newsp -= __SIGNAL_FRAMESIZE32;
 	if (put_user(regs->gpr[1], (u32*)(u64)newsp)
@@ -1063,6 +1064,7 @@ setup_rt_frame32(struct pt_regs *regs, struct sigregs32 *frame,
 
 	flush_icache_range((unsigned long) &frame->tramp[0],
 			   (unsigned long) &frame->tramp[2]);
+	current->thread.fpscr = 0;	/* turn off all fp exceptions */
 
   
 	/* Retrieve rt_sigframe from stack and