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[S390] dasd: Work around gcc bug.

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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>
This commit is contained in:
Peter Oberparleiter 2007-03-26 20:42:38 +02:00 committed by Heiko Carstens
parent e0f2e3a06b
commit 04439694ea
1 changed files with 5 additions and 5 deletions
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10
drivers/s390/block/dasd_diag.c
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@ -65,7 +65,7 @@ static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
* resulting condition code and DIAG return code. */ * resulting condition code and DIAG return code. */
static inline int dia250(void *iob, int cmd) 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 { typedef union {
struct dasd_diag_init_io init_io; struct dasd_diag_init_io init_io;
struct dasd_diag_rw_io rw_io; struct dasd_diag_rw_io rw_io;
@ -74,15 +74,15 @@ static inline int dia250(void *iob, int cmd)
rc = 3; rc = 3;
asm volatile( asm volatile(
" diag 0,%2,0x250\n" " diag 2,%2,0x250\n"
"0: ipm %0\n" "0: ipm %0\n"
" srl %0,28\n" " srl %0,28\n"
" or %0,1\n" " or %0,3\n"
"1:\n" "1:\n"
EX_TABLE(0b,1b) EX_TABLE(0b,1b)
: "+d" (rc), "=m" (*(addr_type *) iob) : "+d" (rc), "=m" (*(addr_type *) iob)
: "d" (cmd), "d" (reg0), "m" (*(addr_type *) iob) : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
: "1", "cc"); : "3", "cc");
return rc; return rc;
} }