s390: add uninitialized_var() to suppress false positive compiler warnings

Get rid of these:

arch/s390/kernel/smp.c:134:19: warning: ‘status’ may be used uninitialized in this function [-Wuninitialized]
arch/s390/mm/pgtable.c:641:10: warning: ‘table’ may be used uninitialized in this function [-Wuninitialized]
arch/s390/mm/pgtable.c:644:12: warning: ‘page’ may be used uninitialized in this function [-Wuninitialized]
drivers/s390/cio/cio.c:1037:14: warning: ‘schid’ may be used uninitialized in this function [-Wuninitialized]

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 8676aab6ea6a..ea431e551c6b 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -126,7 +126,7 @@ static int pcpu_sigp_retry(struct pcpu *pcpu, u8 order, u32 parm)
 
 static inline int pcpu_stopped(struct pcpu *pcpu)
 {
-        u32 status;
+        u32 uninitialized_var(status);
 
         if (__pcpu_sigp(pcpu->address, SIGP_SENSE,
                         0, &status) != SIGP_CC_STATUS_STORED)
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index d83ecbf02018..b402991e43d7 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -609,8 +609,8 @@ static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits)
  */
 unsigned long *page_table_alloc(struct mm_struct *mm, unsigned long vmaddr)
 {
-        struct page *page;
-        unsigned long *table;
+        unsigned long *uninitialized_var(table);
+        struct page *uninitialized_var(page);
         unsigned int mask, bit;
 
         if (mm_has_pgste(mm))