ppc64: prevsp is not used any more

   remove fpscr_pad, not required on 64 bit

arch/ppc64/kernel/signal.c

@@ -247,7 +247,6 @@ int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
 	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */
 	sigset_t set;
 	stack_t st;
-	unsigned long prevsp;
 
 	rt_sf = (struct rt_sigframe *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
 	if (copy_from_user(&sigctx, &rt_sf->uc.uc_mcontext, sizeof(sigctx))
@@ -364,7 +363,6 @@ long sys_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
 	struct sigregs *sr;
 	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */
 	sigset_t set;
-	unsigned long prevsp;
 
 	sc = (struct sigcontext_struct *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
 	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))

include/asm-ppc64/processor.h

@@ -97,7 +97,7 @@
 #define FPSCR_VX	0x20000000	/* Invalid operation summary */
 #define FPSCR_OX	0x10000000	/* Overflow exception summary */
 #define FPSCR_UX	0x08000000	/* Underflow exception summary */
-#define FPSCR_ZX	0x04000000	/* Zero-devide exception summary */
+#define FPSCR_ZX	0x04000000	/* Zero-divide exception summary */
 #define FPSCR_XX	0x02000000	/* Inexact exception summary */
 #define FPSCR_VXSNAN	0x01000000	/* Invalid op for SNaN */
 #define FPSCR_VXISI	0x00800000	/* Invalid op for Inv - Inv */
@@ -653,7 +653,6 @@ struct thread_struct {
 	mm_segment_t	fs;		/* for get_fs() validation */
 	signed long     last_syscall;
 	double		fpr[32];	/* Complete floating point set */
-	unsigned long	fpscr_pad;	/* fpr ... fpscr must be contiguous */
 	unsigned long	fpscr;		/* Floating point status */
 };
 
@@ -664,7 +663,8 @@ struct thread_struct {
 	(struct pt_regs *)INIT_SP - 1, /* regs */ \
 	KERNEL_DS, /*fs*/ \
 	0, /* last_syscall */ \
-	{0}, 0, 0 \
+	{0}, /* fpr */ \
+	0 /* fpscr */ \
 }
 
 /*