From 283c6ebd5a71330eb37c8d08054f1036eeb544dc Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 15 Jun 2021 21:35:10 -0300 Subject: linux: Remove supports_time64 () from clock_getres 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 --- sysdeps/unix/sysv/linux/clock_getres.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) (limited to 'sysdeps/unix') diff --git a/sysdeps/unix/sysv/linux/clock_getres.c b/sysdeps/unix/sysv/linux/clock_getres.c index a9edec93e6..83f0593074 100644 --- a/sysdeps/unix/sysv/linux/clock_getres.c +++ b/sysdeps/unix/sysv/linux/clock_getres.c @@ -21,7 +21,6 @@ #include #include -#include #include #include @@ -34,19 +33,14 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res) #ifndef __NR_clock_getres_time64 # define __NR_clock_getres_time64 __NR_clock_getres #endif - if (supports_time64 ()) - { + #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 - r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res); + r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res); #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. */ -- cgit 1.4.1