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linux: Remove supports_time64 () from clock_getres

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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 21:35:10 -03:00
parent 4c3df0eba5
commit 283c6ebd5a
1 changed files with 5 additions and 11 deletions
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16
sysdeps/unix/sysv/linux/clock_getres.c
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@ -21,7 +21,6 @@
#include <time.h> #include <time.h>
#include <sysdep-vdso.h> #include <sysdep-vdso.h>
#include <time64-support.h>
#include <shlib-compat.h> #include <shlib-compat.h>
#include <kernel-features.h> #include <kernel-features.h>
@ -34,19 +33,14 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res)
#ifndef __NR_clock_getres_time64 #ifndef __NR_clock_getres_time64
# define __NR_clock_getres_time64 __NR_clock_getres # define __NR_clock_getres_time64 __NR_clock_getres
#endif #endif
if (supports_time64 ())
{
#ifdef HAVE_CLOCK_GETRES64_VSYSCALL #ifdef HAVE_CLOCK_GETRES64_VSYSCALL
r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res); r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
#else #else
r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res); r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
#endif #endif
if (r == 0 || errno != ENOSYS)
if (r == 0 || errno != ENOSYS) return r;
return r;
mark_time64_unsupported ();
}
#ifndef __ASSUME_TIME64_SYSCALLS #ifndef __ASSUME_TIME64_SYSCALLS
/* Fallback code that uses 32-bit support. */ /* Fallback code that uses 32-bit support. */