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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-15 22:10:26 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-22 12:09:52 -0300 |
| commit | 4ad8b4645c0869431dba632c3ace0061cc613379 (patch) | |
| tree | 71102daef12cbfa6825a1da723fd9f506defb97e | |
| parent | 283c6ebd5a71330eb37c8d08054f1036eeb544dc (diff) | |
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linux: Remove supports_time64 () from clock_gettime
It breaks the usage case of live migration like CRIU or similar.
The performance drawback is it would require an extra syscall
on older kernels without 64-bit time support.
Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel
(with and without --enable-kernel=5.1) and on x86_64-linux-gnu.
Reviewed-by: Lukasz Majewski <lukma@denx.de>
| -rw-r--r-- | sysdeps/unix/sysv/linux/clock_gettime.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/sysdeps/unix/sysv/linux/clock_gettime.c b/sysdeps/unix/sysv/linux/clock_gettime.c index 781d05c2fd..cfe9370455 100644 --- a/sysdeps/unix/sysv/linux/clock_gettime.c +++ b/sysdeps/unix/sysv/linux/clock_gettime.c @@ -22,7 +22,6 @@ #include <time.h> #include "kernel-posix-cpu-timers.h" #include <sysdep-vdso.h> -#include <time64-support.h> #include <shlib-compat.h> /* Get current value of CLOCK and store it in TP. */ @@ -35,19 +34,14 @@ __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp) # define __NR_clock_gettime64 __NR_clock_gettime #endif - if (supports_time64 ()) - { #ifdef HAVE_CLOCK_GETTIME64_VSYSCALL - r = INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp); + r = INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp); #else - r = INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp); + r = INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp); #endif - if (r == 0 || errno != ENOSYS) - return r; - - mark_time64_unsupported (); - } + if (r == 0 || errno != ENOSYS) + return r; #ifndef __ASSUME_TIME64_SYSCALLS /* Fallback code that uses 32-bit support. */ |