Take an effort to recode the arm64 vdso code from assembler to C
previously submitted by Andrew Pinski <[email protected]>, rework
it for use in both arm and arm64, overlapping any optimizations
for each architecture. But instead of landing it in arm64, land the
result into lib/vdso and unify both implementations to simplify
future maintenance.
If ARCH_PROVIDES_TIMER is not defined, do not expose gettimeofday.
libc will default directly to syscall. Also ifdef clock_gettime
switch cases and stubs if not supported and other unused components.
Signed-off-by: Mark Salyzyn <[email protected]>
Cc: James Morse <[email protected]>
Cc: Russell King <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Kevin Brodsky <[email protected]>
Cc: Andrew Pinski <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
v3:
- do not expose gettimeofday if arch does not support user space timer.
v4:
- update commit message to reflect overall reasoning of patch series.
v5:
- rebase
---
lib/vdso/vgettimeofday.c | 52 +++++++++++++++++++-----------------------------
1 file changed, 20 insertions(+), 32 deletions(-)
diff --git a/lib/vdso/vgettimeofday.c b/lib/vdso/vgettimeofday.c
index d64f60010bb2..079955162be8 100644
--- a/lib/vdso/vgettimeofday.c
+++ b/lib/vdso/vgettimeofday.c
@@ -30,7 +30,9 @@
#include "compiler.h"
#include "datapage.h"
+#ifdef ARCH_PROVIDES_TIMER
DEFINE_FALLBACK(gettimeofday, struct timeval *, tv, struct timezone *, tz)
+#endif
DEFINE_FALLBACK(clock_gettime, clockid_t, clock, struct timespec *, ts)
DEFINE_FALLBACK(clock_getres, clockid_t, clock, struct timespec *, ts)
@@ -291,30 +293,6 @@ static notrace int do_boottime(const struct vdso_data *vd, struct timespec *ts)
return 0;
}
-#else /* ARCH_PROVIDES_TIMER */
-
-static notrace int do_realtime(const struct vdso_data *vd, struct timespec *ts)
-{
- return -1;
-}
-
-static notrace int do_monotonic(const struct vdso_data *vd, struct timespec *ts)
-{
- return -1;
-}
-
-static notrace int do_monotonic_raw(const struct vdso_data *vd,
- struct timespec *ts)
-{
- return -1;
-}
-
-static notrace int do_boottime(const struct vdso_data *vd,
- struct timespec *ts)
-{
- return -1;
-}
-
#endif /* ARCH_PROVIDES_TIMER */
notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
@@ -328,6 +306,7 @@ notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
case CLOCK_MONOTONIC_COARSE:
do_monotonic_coarse(vd, ts);
break;
+#ifdef ARCH_PROVIDES_TIMER
case CLOCK_REALTIME:
if (do_realtime(vd, ts))
goto fallback;
@@ -344,6 +323,7 @@ notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
if (do_boottime(vd, ts))
goto fallback;
break;
+#endif
default:
goto fallback;
}
@@ -353,6 +333,7 @@ notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
return clock_gettime_fallback(clock, ts);
}
+#ifdef ARCH_PROVIDES_TIMER
notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
{
const struct vdso_data *vd = __get_datapage();
@@ -374,21 +355,28 @@ notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
return 0;
}
+#endif
int __vdso_clock_getres(clockid_t clock, struct timespec *res)
{
long nsec;
- if (clock == CLOCK_REALTIME ||
- clock == CLOCK_BOOTTIME ||
- clock == CLOCK_MONOTONIC ||
- clock == CLOCK_MONOTONIC_RAW)
- nsec = MONOTONIC_RES_NSEC;
- else if (clock == CLOCK_REALTIME_COARSE ||
- clock == CLOCK_MONOTONIC_COARSE)
+ switch (clock) {
+ case CLOCK_REALTIME_COARSE:
+ case CLOCK_MONOTONIC_COARSE:
nsec = LOW_RES_NSEC;
- else
+ break;
+#ifdef ARCH_PROVIDES_TIMER
+ case CLOCK_REALTIME:
+ case CLOCK_MONOTONIC:
+ case CLOCK_MONOTONIC_RAW:
+ case CLOCK_BOOTTIME:
+ nsec = MONOTONIC_RES_NSEC;
+ break;
+#endif
+ default:
return clock_getres_fallback(clock, res);
+ }
if (likely(res != NULL)) {
res->tv_sec = 0;
--
2.15.0.403.gc27cc4dac6-goog
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