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>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 8676aab6ea6aa4c8c02bc5769c09ca95d7854721..ea431e551c6b2704a19d068376d9edb84c3da577 100644 (file)
--- 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 d83ecbf020184640d447bcfd39f4a7f9d7c29fba..b402991e43d71614cc111918a6b03a4af8525b2e 100644 (file)
--- 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))

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 33d1ef7035936732ec44c32c386be511294fe1f0..8e927b9f285f25de6ba520bf04f07661a02e51aa 100644 (file)
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -1029,7 +1029,7 @@ extern void do_reipl_asm(__u32 schid);
 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
 void reipl_ccw_dev(struct ccw_dev_id *devid)
 {
-       struct subchannel_id schid;
+       struct subchannel_id uninitialized_var(schid);
 
        s390_reset_system(NULL, NULL);
        if (reipl_find_schid(devid, &schid) != 0)