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linux: Remove supports_time64 () from clock_gettime

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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>
This commit is contained in:
Adhemerval Zanella 2021-06-15 22:10:26 -03:00
parent 283c6ebd5a
commit 4ad8b4645c
1 changed files with 4 additions and 10 deletions
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14
sysdeps/unix/sysv/linux/clock_gettime.c
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@ -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. */