Commit 6816e212 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/sclp: Convert to use flag output macros 



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: default avatarJuergen Christ <jchrist@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent cd5e5a37

drivers/s390/char/sclp.h

+11 −7
Original line number Diff line number Diff line
@@ -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)