ptrace: cleanup arch_ptrace() on powerpc

Use new 'datavp' and 'datalp' variables in order to remove unnecessary
castings.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 25 deletions

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 136763568a7b..a9b32967cff6 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1409,26 +1409,28 @@ static long ppc_del_hwdebug(struct task_struct *child, long addr, long data)
 static long arch_ptrace_old(struct task_struct *child, long request,
                             unsigned long addr, unsigned long data)
 {
+        void __user *datavp = (void __user *) data;
+
         switch (request) {
         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_GPR, 0, 32 * sizeof(long),
-                                           (void __user *) data);
+                                           datavp);
 
         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_GPR, 0, 32 * sizeof(long),
-                                             (const void __user *) data);
+                                             datavp);
 
         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_FPR, 0, 32 * sizeof(double),
-                                           (void __user *) data);
+                                           datavp);
 
         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_FPR, 0, 32 * sizeof(double),
-                                             (const void __user *) data);
+                                             datavp);
         }
 
         return -EPERM;
@@ -1438,6 +1440,8 @@ long arch_ptrace(struct task_struct *child, long request,
                  unsigned long addr, unsigned long data)
 {
         int ret = -EPERM;
+        void __user *datavp = (void __user *) data;
+        unsigned long __user *datalp = datavp;
 
         switch (request) {
         /* read the word at location addr in the USER area. */
@@ -1464,7 +1468,7 @@ long arch_ptrace(struct task_struct *child, long request,
                         tmp = ((unsigned long *)child->thread.fpr)
                                 [TS_FPRWIDTH * (index - PT_FPR0)];
                 }
-                ret = put_user(tmp,(unsigned long __user *) data);
+                ret = put_user(tmp, datalp);
                 break;
         }
 
@@ -1526,11 +1530,11 @@ long arch_ptrace(struct task_struct *child, long request,
                 dbginfo.features = 0;
 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
 
-                if (!access_ok(VERIFY_WRITE, data,
+                if (!access_ok(VERIFY_WRITE, datavp,
                                sizeof(struct ppc_debug_info)))
                         return -EFAULT;
-                ret = __copy_to_user((struct ppc_debug_info __user *)data,
-                                     &dbginfo, sizeof(struct ppc_debug_info)) ?
+                ret = __copy_to_user(datavp, &dbginfo,
+                                     sizeof(struct ppc_debug_info)) ?
                       -EFAULT : 0;
                 break;
         }
@@ -1538,11 +1542,10 @@ long arch_ptrace(struct task_struct *child, long request,
         case PPC_PTRACE_SETHWDEBUG: {
                 struct ppc_hw_breakpoint bp_info;
 
-                if (!access_ok(VERIFY_READ, data,
+                if (!access_ok(VERIFY_READ, datavp,
                                sizeof(struct ppc_hw_breakpoint)))
                         return -EFAULT;
-                ret = __copy_from_user(&bp_info,
-                                       (struct ppc_hw_breakpoint __user *)data,
+                ret = __copy_from_user(&bp_info, datavp,
                                        sizeof(struct ppc_hw_breakpoint)) ?
                       -EFAULT : 0;
                 if (!ret)
@@ -1561,11 +1564,9 @@ long arch_ptrace(struct task_struct *child, long request,
                 if (addr > 0)
                         break;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
-                ret = put_user(child->thread.dac1,
-                               (unsigned long __user *)data);
+                ret = put_user(child->thread.dac1, datalp);
 #else
-                ret = put_user(child->thread.dabr,
-                               (unsigned long __user *)data);
+                ret = put_user(child->thread.dabr, datalp);
 #endif
                 break;
         }
@@ -1581,7 +1582,7 @@ long arch_ptrace(struct task_struct *child, long request,
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_GPR,
                                            0, sizeof(struct pt_regs),
-                                           (void __user *) data);
+                                           datavp);
 
 #ifdef CONFIG_PPC64
         case PTRACE_SETREGS64:
@@ -1590,19 +1591,19 @@ long arch_ptrace(struct task_struct *child, long request,
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_GPR,
                                              0, sizeof(struct pt_regs),
-                                             (const void __user *) data);
+                                             datavp);
 
         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_FPR,
                                            0, sizeof(elf_fpregset_t),
-                                           (void __user *) data);
+                                           datavp);
 
         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_FPR,
                                              0, sizeof(elf_fpregset_t),
-                                             (const void __user *) data);
+                                             datavp);
 
 #ifdef CONFIG_ALTIVEC
         case PTRACE_GETVRREGS:
@@ -1610,40 +1611,40 @@ long arch_ptrace(struct task_struct *child, long request,
                                            REGSET_VMX,
                                            0, (33 * sizeof(vector128) +
                                                sizeof(u32)),
-                                           (void __user *) data);
+                                           datavp);
 
         case PTRACE_SETVRREGS:
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_VMX,
                                              0, (33 * sizeof(vector128) +
                                                  sizeof(u32)),
-                                             (const void __user *) data);
+                                             datavp);
 #endif
 #ifdef CONFIG_VSX
         case PTRACE_GETVSRREGS:
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_VSX,
                                            0, 32 * sizeof(double),
-                                           (void __user *) data);
+                                           datavp);
 
         case PTRACE_SETVSRREGS:
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_VSX,
                                              0, 32 * sizeof(double),
-                                             (const void __user *) data);
+                                             datavp);
 #endif
 #ifdef CONFIG_SPE
         case PTRACE_GETEVRREGS:
                 /* Get the child spe register state. */
                 return copy_regset_to_user(child, &user_ppc_native_view,
                                            REGSET_SPE, 0, 35 * sizeof(u32),
-                                           (void __user *) data);
+                                           datavp);
 
         case PTRACE_SETEVRREGS:
                 /* Set the child spe register state. */
                 return copy_regset_from_user(child, &user_ppc_native_view,
                                              REGSET_SPE, 0, 35 * sizeof(u32),
-                                             (const void __user *) data);
+                                             datavp);
 #endif
 
         /* Old reverse args ptrace callss */