Commit 36af1c5c authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/vdso: use system call functions 



Use system call functions instead of open-coding svc inline
assemblies. This is mostly to get rid of even more register asm
constructs.
Besides that, it makes the code also a bit easier to understand.
The generated code is identical to what is was before.

Reviewed-by: default avatarSven Schnelle <svens@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 91f05c27

arch/s390/include/asm/vdso/gettimeofday.h

+4 −18
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


#define VDSO_HAS_CLOCK_GETRES 1



#include <asm/syscall.h>

#include <asm/timex.h>

#include <asm/unistd.h>

#include <linux/compiler.h>
@@ -35,35 +36,20 @@ static inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_data * 
static __always_inline

long clock_gettime_fallback(clockid_t clkid, struct __kernel_timespec *ts)

{

	register unsigned long r1 __asm__("r1") = __NR_clock_gettime;

	register unsigned long r2 __asm__("r2") = (unsigned long)clkid;

	register void *r3 __asm__("r3") = ts;



	asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");

	return r2;

	return syscall2(__NR_clock_gettime, (long)clkid, (long)ts);

}



static __always_inline

long gettimeofday_fallback(register struct __kernel_old_timeval *tv,

			   register struct timezone *tz)

{

	register unsigned long r1 __asm__("r1") = __NR_gettimeofday;

	register unsigned long r2 __asm__("r2") = (unsigned long)tv;

	register void *r3 __asm__("r3") = tz;



	asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");

	return r2;

	return syscall2(__NR_gettimeofday, (long)tv, (long)tz);

}



static __always_inline

long clock_getres_fallback(clockid_t clkid, struct __kernel_timespec *ts)

{

	register unsigned long r1 __asm__("r1") = __NR_clock_getres;

	register unsigned long r2 __asm__("r2") = (unsigned long)clkid;

	register void *r3 __asm__("r3") = ts;



	asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");

	return r2;

	return syscall2(__NR_clock_getres, (long)clkid, (long)ts);

}



#ifdef CONFIG_TIME_NS