Revert "[POWERPC] Add compat handler for PTRACE_GETSIGINFO"

This reverts commit e4cc589, as
requested by Roland McGrath, because compat_ptrace_request (added in
commit e16b278, "ptrace:
compat_ptrace_request siginfo") now handles this case.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/ppc32.h

@@ -135,6 +135,4 @@ struct ucontext32 {
 	struct mcontext32	uc_mcontext;
 };
 
-extern int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s);
-
 #endif  /* _PPC64_PPC32_H */

arch/powerpc/kernel/ptrace32.c

@@ -29,15 +29,12 @@
 #include <linux/security.h>
 #include <linux/signal.h>
 #include <linux/compat.h>
-#include <linux/elf.h>
 
 #include <asm/uaccess.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
 
-#include "ppc32.h"
-
 /*
  * does not yet catch signals sent when the child dies.
  * in exit.c or in signal.c.
@@ -67,27 +64,6 @@ static long compat_ptrace_old(struct task_struct *child, long request,
 	return -EPERM;
 }
 
-static int compat_ptrace_getsiginfo(struct task_struct *child, compat_siginfo_t __user *data)
-{
-	siginfo_t lastinfo;
-	int error = -ESRCH;
-
-	read_lock(&tasklist_lock);
-	if (likely(child->sighand != NULL)) {
-		error = -EINVAL;
-		spin_lock_irq(&child->sighand->siglock);
-		if (likely(child->last_siginfo != NULL)) {
-			lastinfo = *child->last_siginfo;
-			error = 0;
-		}
-		spin_unlock_irq(&child->sighand->siglock);
-	}
-	read_unlock(&tasklist_lock);
-	if (!error)
-		return copy_siginfo_to_user32(data, &lastinfo);
-	return error;
-}
-
 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 			compat_ulong_t caddr, compat_ulong_t cdata)
 {
@@ -306,9 +282,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 			0, PT_REGS_COUNT * sizeof(compat_long_t),
 			compat_ptr(data));
 
-	case PTRACE_GETSIGINFO:
-		return compat_ptrace_getsiginfo(child, compat_ptr(data));
-
 	case PTRACE_GETFPREGS:
 	case PTRACE_SETFPREGS:
 	case PTRACE_GETVRREGS: