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authorDavid S. Miller <davem@davemloft.net>2018-10-22 08:09:40 +0300
committerDavid S. Miller <davem@davemloft.net>2018-10-23 01:27:49 +0300
commit794b88e047588965ad8f716245857b452f118e13 (patch)
treed469464bec0ef493f2b412fb52109a7e2d5f6d6c /arch/sparc/vdso/vclock_gettime.c
parent2f6c9bf31a0b16aeccb42b73f8d0ddf9bea88f3f (diff)
downloadlinux-794b88e047588965ad8f716245857b452f118e13.tar.xz
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>
Diffstat (limited to 'arch/sparc/vdso/vclock_gettime.c')
-rw-r--r--arch/sparc/vdso/vclock_gettime.c39
1 files changed, 17 insertions, 22 deletions
diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index a0c8a4b008d5..75c49fcb57aa 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -60,24 +60,22 @@
* Compute the vvar page's address in the process address space, and return it
* as a pointer to the vvar_data.
*/
-static notrace noinline struct vvar_data *
-get_vvar_data(void)
+notrace static __always_inline struct vvar_data *get_vvar_data(void)
{
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.
*/
- ret = (unsigned long)__builtin_return_address(0);
+ __asm__("rd %%pc, %0" : "=r" (ret));
ret &= ~(8192 - 1);
ret -= 8192;
return (struct vvar_data *) ret;
}
-static notrace long
-vdso_fallback_gettime(long clock, struct timespec *ts)
+notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
{
register long num __asm__("g1") = __NR_clock_gettime;
register long o0 __asm__("o0") = clock;
@@ -88,8 +86,7 @@ vdso_fallback_gettime(long clock, struct timespec *ts)
return o0;
}
-static notrace __always_inline long
-vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
+notrace static long vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
{
register long num __asm__("g1") = __NR_gettimeofday;
register long o0 __asm__("o0") = (long) tv;
@@ -101,8 +98,8 @@ vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
}
#ifdef CONFIG_SPARC64
-static notrace noinline u64
-vread_tick(void) {
+notrace static __always_inline u64 vread_tick(void)
+{
u64 ret;
__asm__ __volatile__("1:\n\t"
@@ -118,8 +115,7 @@ vread_tick(void) {
return ret & ~TICK_PRIV_BIT;
}
#else
-static notrace noinline u64
-vread_tick(void)
+notrace static __always_inline u64 vread_tick(void)
{
register unsigned long long ret asm("o4");
@@ -138,8 +134,7 @@ vread_tick(void)
}
#endif
-static notrace inline u64
-vgetsns(struct vvar_data *vvar)
+notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
{
u64 v;
u64 cycles;
@@ -149,8 +144,8 @@ vgetsns(struct vvar_data *vvar)
return v * vvar->clock.mult;
}
-static notrace noinline int
-do_realtime(struct vvar_data *vvar, struct timespec *ts)
+notrace static __always_inline int do_realtime(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
u64 ns;
@@ -169,8 +164,8 @@ do_realtime(struct vvar_data *vvar, struct timespec *ts)
return 0;
}
-static notrace noinline int
-do_monotonic(struct vvar_data *vvar, struct timespec *ts)
+notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
u64 ns;
@@ -189,8 +184,8 @@ do_monotonic(struct vvar_data *vvar, struct timespec *ts)
return 0;
}
-static notrace noinline int
-do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
+notrace static int do_realtime_coarse(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
@@ -202,8 +197,8 @@ do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
return 0;
}
-static notrace noinline int
-do_monotonic_coarse(struct vvar_data *vvar, struct timespec *ts)
+notrace static int do_monotonic_coarse(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;