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s390/sclp: Convert to use flag output macros

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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 16:11:51 +01:00
parent cd5e5a3723
commit 6816e2124d
1 changed files with 11 additions and 7 deletions
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18
drivers/s390/char/sclp.h
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@ -14,6 +14,7 @@
#include <asm/asm-extable.h>
#include <asm/sclp.h>
#include <asm/ebcdic.h>
#include <asm/asm.h>
/* maximum number of pages concerning our own memory management */
#define MAX_KMEM_PAGES (sizeof(unsigned long) << 3)
@ -325,19 +326,22 @@ struct read_info_sccb * __init sclp_early_get_info(void);
/* Perform service call. Return 0 on success, non-zero otherwise. */
static inline int sclp_service_call(sclp_cmdw_t command, void *sccb)
{
int cc = 4; /* Initialize for program check handling */
int cc, exception;
exception = 1;
asm volatile(
"0: .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
"1: ipm %0\n"
" srl %0,28\n"
"0: .insn rre,0xb2200000,%[cmd],%[sccb]\n" /* servc */
"1: lhi %[exc],0\n"
"2:\n"
CC_IPM(cc)
EX_TABLE(0b, 2b)
EX_TABLE(1b, 2b)
: "+&d" (cc) : "d" (command), "a" (__pa(sccb))
: "cc", "memory");
if (cc == 4)
: CC_OUT(cc, cc), [exc] "+d" (exception)
: [cmd] "d" (command), [sccb] "a" (__pa(sccb))
: CC_CLOBBER_LIST("memory"));
if (exception)
return -EINVAL;
cc = CC_TRANSFORM(cc);
if (cc == 3)
return -EIO;
if (cc == 2)