[S390] dasd: Work around gcc bug.
gcc incorrectly removes initialization of register 0 in dasd diag
inline assembly. Use different register to work around this compiler
bug.
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index ab782bb..e810e4a 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -65,7 +65,7 @@
* resulting condition code and DIAG return code. */
static inline int dia250(void *iob, int cmd)
{
- register unsigned long reg0 asm ("0") = (unsigned long) iob;
+ register unsigned long reg2 asm ("2") = (unsigned long) iob;
typedef union {
struct dasd_diag_init_io init_io;
struct dasd_diag_rw_io rw_io;
@@ -74,15 +74,15 @@
rc = 3;
asm volatile(
- " diag 0,%2,0x250\n"
+ " diag 2,%2,0x250\n"
"0: ipm %0\n"
" srl %0,28\n"
- " or %0,1\n"
+ " or %0,3\n"
"1:\n"
EX_TABLE(0b,1b)
: "+d" (rc), "=m" (*(addr_type *) iob)
- : "d" (cmd), "d" (reg0), "m" (*(addr_type *) iob)
- : "1", "cc");
+ : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
+ : "3", "cc");
return rc;
}