ppc64: Remove last_syscall, we can work the syscall out easily from

our symbolic backtrace.

arch/ppc64/kernel/entry.S

@@ -56,7 +56,6 @@ show_syscalls_task:
  * Handle a system call.
  */
 _GLOBAL(DoSyscall)
-	std	r0,THREAD+LAST_SYSCALL(r13)
 	ld	r11,_CCR(r1)	/* Clear SO bit in CR */
 	lis	r10,0x1000
 	andc	r11,r11,r10

arch/ppc64/kernel/mk_defs.c

@@ -52,7 +52,6 @@ main(void)
 
 	/* task_struct->thread */
 	DEFINE(THREAD, offsetof(struct task_struct, thread));
-	DEFINE(LAST_SYSCALL, offsetof(struct thread_struct, last_syscall));
 	DEFINE(PT_REGS, offsetof(struct thread_struct, regs));
 	DEFINE(THREAD_FPR0, offsetof(struct thread_struct, fpr[0]));
 	DEFINE(THREAD_FPSCR, offsetof(struct thread_struct, fpscr));

arch/ppc64/kernel/process.c

@@ -117,7 +117,6 @@ void show_regs(struct pt_regs * regs)
 	       regs->msr&MSR_DR ? 1 : 0);
 	printk("TASK = %p[%d] '%s' ",
 	       current, current->pid, current->comm);
-	printk("Last syscall: %ld ", current->thread.last_syscall);
 	printk("\nlast math %p ", last_task_used_math);
 	
 #ifdef CONFIG_SMP
@@ -223,8 +222,6 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	memcpy(&p->thread.fpr, &current->thread.fpr, sizeof(p->thread.fpr));
 	p->thread.fpscr = current->thread.fpscr;
 
-	p->thread.last_syscall = -1;
-
 	return 0;
 }
 

include/asm-ppc64/processor.h

@@ -651,7 +651,6 @@ struct thread_struct {
 	unsigned long	ksp;		/* Kernel stack pointer */
 	struct pt_regs	*regs;		/* Pointer to saved register state */
 	mm_segment_t	fs;		/* for get_fs() validation */
-	signed long     last_syscall;
 	double		fpr[32];	/* Complete floating point set */
 	unsigned long	fpscr;		/* Floating point status */
 };
@@ -662,7 +661,6 @@ struct thread_struct {
 	INIT_SP, /* ksp */ \
 	(struct pt_regs *)INIT_SP - 1, /* regs */ \
 	KERNEL_DS, /*fs*/ \
-	0, /* last_syscall */ \
 	{0}, /* fpr */ \
 	0 /* fpscr */ \
 }