[S390] remove ptrace warning on 31 bit.

A kernel compile on 31 bit gives the following warnings in ptrace.c:

arch/s390/kernel/ptrace.c: In function 'peek_user':
arch/s390/kernel/ptrace.c:207: warning: unused variable 'dummy'
arch/s390/kernel/ptrace.c: In function 'poke_user':
arch/s390/kernel/ptrace.c:315: warning: unused variable 'dummy'

Getting rid of the dummy variables removes the warnings.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 38ff2bce1203..75c496f4f16d 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -204,7 +204,6 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
 static int
 peek_user(struct task_struct *child, addr_t addr, addr_t data)
 {
-        struct user *dummy = NULL;
         addr_t tmp, mask;
 
         /*
@@ -213,8 +212,8 @@ peek_user(struct task_struct *child, addr_t addr, addr_t data)
          */
         mask = __ADDR_MASK;
 #ifdef CONFIG_64BIT
-        if (addr >= (addr_t) &dummy->regs.acrs &&
-            addr < (addr_t) &dummy->regs.orig_gpr2)
+        if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
+            addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
                 mask = 3;
 #endif
         if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
@@ -312,7 +311,6 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
 static int
 poke_user(struct task_struct *child, addr_t addr, addr_t data)
 {
-        struct user *dummy = NULL;
         addr_t mask;
 
         /*
@@ -321,8 +319,8 @@ poke_user(struct task_struct *child, addr_t addr, addr_t data)
          */
         mask = __ADDR_MASK;
 #ifdef CONFIG_64BIT
-        if (addr >= (addr_t) &dummy->regs.acrs &&
-            addr < (addr_t) &dummy->regs.orig_gpr2)
+        if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
+            addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
                 mask = 3;
 #endif
         if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)