Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-04 04:04:19 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

s390/dasd: Convert to use flag output macros

Browse Source 
Use flag output macros in inline asm to allow for better code generation if
the compiler has support for the flag output constraint.

Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-11-07 16:11:50 +01:00
parent d80888232e
commit cd5e5a3723
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/s390/block/dasd_diag.c
View File

@ -25,6 +25,7 @@
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/vtoc.h>
#include <asm/asm.h>
#include "dasd_int.h"
#include "dasd_diag.h"
@ -67,22 +68,24 @@ static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
static inline int __dia250(void *iob, int cmd)
{
union register_pair rx = { .even = (unsigned long)iob, };
int cc, exception;
typedef union {
struct dasd_diag_init_io init_io;
struct dasd_diag_rw_io rw_io;
} addr_type;
int cc;
cc = 3;
exception = 1;
asm volatile(
" diag %[rx],%[cmd],0x250\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"0: lhi %[exc],0\n"
"1:\n"
CC_IPM(cc)
EX_TABLE(0b,1b)
: [cc] "+&d" (cc), [rx] "+&d" (rx.pair), "+m" (*(addr_type *)iob)
: CC_OUT(cc, cc), [rx] "+d" (rx.pair),
"+m" (*(addr_type *)iob), [exc] "+d" (exception)
: [cmd] "d" (cmd)
: "cc");
: CC_CLOBBER);
cc = exception ? 3 : CC_TRANSFORM(cc);
return cc | rx.odd;
}