Use exclusively clock_gettime to implement gettimeofday.

In 2.31 we changed most ports to implement gettimeofday using
clock_gettime(CLOCK_REALTIME[_COARSE]), but we kept around a handful
of Linux-specific implementations that went directly to the vDSO.

Actual performance testing (on x86-64) indicates that there is no
measurable difference between invoking the vDSO directly and calling
clock_gettime (which then calls into the vDSO), so remove all of these
for simplicity’s sake.

diff --git a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
deleted file mode 100644 (file)
index 0e3c7f7..0000000
--- a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/* Copyright (C) 2018-2020 Free Software Foundation, Inc.
-
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define USE_IFUNC_GETTIMEOFDAY
-#include <sysdeps/unix/sysv/linux/gettimeofday.c>

diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
deleted file mode 100644 (file)
index d5cdb22..0000000
--- a/sysdeps/unix/sysv/linux/gettimeofday.c
+++ /dev/null
@@ -1,58 +0,0 @@
-/* gettimeofday - set time.  Linux version.
-   Copyright (C) 2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-/* Optimize the function call by setting the PLT directly to vDSO symbol.  */
-#ifdef USE_IFUNC_GETTIMEOFDAY
-# include <time.h>
-# include <string.h>
-# include <sysdep.h>
-# include <sysdep-vdso.h>
-
-# ifdef SHARED
-#  include <dl-vdso.h>
-# include <libc-vdso.h>
-
-static int
-__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
-{
-  if (__glibc_unlikely (tz != 0))
-    memset (tz, 0, sizeof *tz);
-  return INLINE_SYSCALL_CALL (gettimeofday, tv, tz);
-}
-
-# undef INIT_ARCH
-# define INIT_ARCH() \
-  void *vdso_gettimeofday = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL)
-libc_ifunc (__gettimeofday,
-           vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
-                             : (void *) __gettimeofday_syscall)
-
-# else
-int
-__gettimeofday (struct timeval *restrict tv, void *restrict tz)
-{
-  if (__glibc_unlikely (tz != 0))
-    memset (tz, 0, sizeof *tz);
-
-  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
-}
-# endif
-weak_alias (__gettimeofday, gettimeofday)
-#else /* USE_IFUNC_GETTIMEOFDAY  */
-# include <time/gettimeofday.c>
-#endif

diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
deleted file mode 100644 (file)
index 183fb0a..0000000
--- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define USE_IFUNC_GETTIMEOFDAY
-#include <sysdeps/unix/sysv/linux/gettimeofday.c>

diff --git a/sysdeps/unix/sysv/linux/x86/gettimeofday.c b/sysdeps/unix/sysv/linux/x86/gettimeofday.c
deleted file mode 100644 (file)
index 1b7aa88..0000000
--- a/sysdeps/unix/sysv/linux/x86/gettimeofday.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/* gettimeofday - get the time.  Linux/x86 version.
-   Copyright (C) 2015-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define USE_IFUNC_GETTIMEOFDAY
-#include <sysdeps/unix/sysv/linux/gettimeofday.c>