AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

ARM: 8931/1: Add clock_getres entry point

Browse Source 
The generic vDSO library provides an implementation of clock_getres() that
can be leveraged by each architecture.

Add clock_getres() entry point on arm to be on pair with arm64.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Vincenzo Frascino 2019-11-04 12:02:19 +01:00 committed by Russell King
parent 20e2fc4231
commit 052e76a31b
3 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/arm/include/asm/vdso/gettimeofday.h
View File

@ -12,6 +12,8 @@
#include <asm/unistd.h>
#include <uapi/linux/time.h>
#define VDSO_HAS_CLOCK_GETRES 1
extern struct vdso_data *__get_datapage(void);
static __always_inline int gettimeofday_fallback(
@ -50,6 +52,24 @@ static __always_inline long clock_gettime_fallback(
return ret;
}
static __always_inline int clock_getres_fallback(
clockid_t _clkid,
struct __kernel_timespec *_ts)
{
register struct __kernel_timespec *ts asm("r1") = _ts;
register clockid_t clkid asm("r0") = _clkid;
register long ret asm ("r0");
register long nr asm("r7") = __NR_clock_getres_time64;
asm volatile(
" swi #0\n"
: "=r" (ret)
: "r" (clkid), "r" (ts), "r" (nr)
: "memory");
return ret;
}
static __always_inline u64 __arch_get_hw_counter(int clock_mode)
{
#ifdef CONFIG_ARM_ARCH_TIMER

1
arch/arm/vdso/vdso.lds.S
View File

@ -71,6 +71,7 @@ VERSION
global:
__vdso_clock_gettime;
__vdso_gettimeofday;
__vdso_clock_getres;
local: *;
};
}

6
arch/arm/vdso/vgettimeofday.c
View File

@ -19,6 +19,12 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
return __cvdso_gettimeofday(tv, tz);
}
int __vdso_clock_getres(clockid_t clock_id,
struct old_timespec32 *res)
{
return __cvdso_clock_getres_time32(clock_id, res);
}
/* Avoid unresolved references emitted by GCC */
void __aeabi_unwind_cpp_pr0(void)