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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: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-07-13 16:21:24 +02:00
parent 91f05c2744
commit 36af1c5c15
1 changed files with 4 additions and 18 deletions
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22
arch/s390/include/asm/vdso/gettimeofday.h
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@ -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