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WSL2-Linux-Kernel
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sparc: Inline VDSO gettime code aggressively. 

One interesting thing we need to do is stop using
__builtin_return_address() in get_vvar_data().

Simply read the %pc register instead.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-10-21 22:09:40 -07:00
Родитель 2f6c9bf31a
Коммит 794b88e047
1 изменённых файлов: 17 добавлений и 22 удалений
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39
arch/sparc/vdso/vclock_gettime.c
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@ -60,24 +60,22 @@
* Compute the vvar page's address in the process address space, and return it * Compute the vvar page's address in the process address space, and return it
* as a pointer to the vvar_data. * as a pointer to the vvar_data.
*/ */
static notrace noinline struct vvar_data * notrace static __always_inline struct vvar_data *get_vvar_data(void)
get_vvar_data(void)
{ {
unsigned long ret; unsigned long ret;
/* /*
* vdso data page is the first vDSO page so grab the return address * vdso data page is the first vDSO page so grab the PC
* and move up a page to get to the data page. * and move up a page to get to the data page.
*/ */
ret = (unsigned long)__builtin_return_address(0); __asm__("rd %%pc, %0" : "=r" (ret));
ret &= ~(8192 - 1); ret &= ~(8192 - 1);
ret -= 8192; ret -= 8192;
return (struct vvar_data *) ret; return (struct vvar_data *) ret;
} }
static notrace long notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
vdso_fallback_gettime(long clock, struct timespec *ts)
{ {
register long num __asm__("g1") = __NR_clock_gettime; register long num __asm__("g1") = __NR_clock_gettime;
register long o0 __asm__("o0") = clock; register long o0 __asm__("o0") = clock;
@ -88,8 +86,7 @@ vdso_fallback_gettime(long clock, struct timespec *ts)
return o0; return o0;
} }
static notrace __always_inline long notrace static long vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
{ {
register long num __asm__("g1") = __NR_gettimeofday; register long num __asm__("g1") = __NR_gettimeofday;
register long o0 __asm__("o0") = (long) tv; register long o0 __asm__("o0") = (long) tv;
@ -101,8 +98,8 @@ vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
} }
#ifdef CONFIG_SPARC64 #ifdef CONFIG_SPARC64
static notrace noinline u64 notrace static __always_inline u64 vread_tick(void)
vread_tick(void) { {
u64 ret; u64 ret;
__asm__ __volatile__("1:\n\t" __asm__ __volatile__("1:\n\t"
@ -118,8 +115,7 @@ vread_tick(void) {
return ret & ~TICK_PRIV_BIT; return ret & ~TICK_PRIV_BIT;
} }
#else #else
static notrace noinline u64 notrace static __always_inline u64 vread_tick(void)
vread_tick(void)
{ {
register unsigned long long ret asm("o4"); register unsigned long long ret asm("o4");
@ -138,8 +134,7 @@ vread_tick(void)
} }
#endif #endif
static notrace inline u64 notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
vgetsns(struct vvar_data *vvar)
{ {
u64 v; u64 v;
u64 cycles; u64 cycles;
@ -149,8 +144,8 @@ vgetsns(struct vvar_data *vvar)
return v * vvar->clock.mult; return v * vvar->clock.mult;
} }
static notrace noinline int notrace static __always_inline int do_realtime(struct vvar_data *vvar,
do_realtime(struct vvar_data *vvar, struct timespec *ts) struct timespec *ts)
{ {
unsigned long seq; unsigned long seq;
u64 ns; u64 ns;
@ -169,8 +164,8 @@ do_realtime(struct vvar_data *vvar, struct timespec *ts)
return 0; return 0;
} }
static notrace noinline int notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
do_monotonic(struct vvar_data *vvar, struct timespec *ts) struct timespec *ts)
{ {
unsigned long seq; unsigned long seq;
u64 ns; u64 ns;
@ -189,8 +184,8 @@ do_monotonic(struct vvar_data *vvar, struct timespec *ts)
return 0; return 0;
} }
static notrace noinline int notrace static int do_realtime_coarse(struct vvar_data *vvar,
do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts) struct timespec *ts)
{ {
unsigned long seq; unsigned long seq;
@ -202,8 +197,8 @@ do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
return 0; return 0;
} }
static notrace noinline int notrace static int do_monotonic_coarse(struct vvar_data *vvar,
do_monotonic_coarse(struct vvar_data *vvar, struct timespec *ts) struct timespec *ts)
{ {
unsigned long seq; unsigned long seq;