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Require Linux kernel 3.2 or later on x86 / x86_64.

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As per the recent discussion, this patch implements a requirement for
Linux 3.2 or later for x86 and x86_64.  This is only the initial
change to increase the configured minimum; it's expected that followup
patches would deal with associated removal of conditionals that are no
longer needed.  If we remove the start-up test on the kernel version,
of course the NEWS and README text should then be revised (to reflect
that this version is just one such that glibc does not intend to
include compatibility code for any older kernel version, rather than
older kernels necessarily failing to work or glibc necessarily having
compatibility code for newer interfaces).

The followups would be able to assume presence of getcpu (x86_64),
recvmmsg (not always through its own syscall, sometimes only through
socketcall), sendmmsg (likewise), /proc/$pid/task/$tid/comm, f_flags
from statfs, prlimit64.

Tested for x86_64 and x86.

	* sysdeps/unix/sysv/linux/i386/configure.ac (arch_minimum_kernel):
	Remove.
	* sysdeps/unix/sysv/linux/i386/configure: Regenerated.
	* sysdeps/unix/sysv/linux/x86_64/64/configure.ac
	(arch_minimum_kernel): Remove.
	* sysdeps/unix/sysv/linux/x86_64/64/configure: Regenerated.
	* README: Update statement about Linux kernel requirements.
This commit is contained in:
Joseph Myers 2017-05-08 10:45:20 +00:00
parent 717da4b3be
commit 139ace9575
7 changed files with 15 additions and 11 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2017-05-08 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/i386/configure.ac (arch_minimum_kernel):
Remove.
* sysdeps/unix/sysv/linux/i386/configure: Regenerated.
* sysdeps/unix/sysv/linux/x86_64/64/configure.ac
(arch_minimum_kernel): Remove.
* sysdeps/unix/sysv/linux/x86_64/64/configure: Regenerated.
* README: Update statement about Linux kernel requirements.
2017-05-04 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* manual/llio.texi: Add preadv and pwritev documentation.

4
NEWS
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@ -57,6 +57,10 @@ Version 2.26
be added on next major revision of POSIX, so current support is enabled
with _GNU_SOURCE.
* The minimum Linux kernel version that this version of the GNU C Library
can be used with on i[4567]86 and x86_64 is 3.2. A Linux 3.2 or later
kernel was already required on all other architectures.
Security related changes:
* The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,

4
README
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@ -17,9 +17,7 @@ GNU/Hurd support requires out-of-tree patches that will eventually be
incorporated into an official GNU C Library release.
When working with Linux kernels, this version of the GNU C Library
requires Linux kernel version 3.2 or later on all architectures except
i[4567]86 and x86_64, where Linux kernel version 2.6.32 or later
suffices.
requires Linux kernel version 3.2 or later.
Also note that the shared version of the libgcc_s library must be
installed for the pthread library to work correctly.

2
sysdeps/unix/sysv/linux/i386/configure vendored
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@ -1,8 +1,6 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/unix/sysv/linux/i386.
arch_minimum_kernel=2.6.32
# Check if CFLAGS allows compiler to use ebp register in inline assembly.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler flags allows ebp in inline assembly" >&5

2
sysdeps/unix/sysv/linux/i386/configure.ac
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@ -1,8 +1,6 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/i386.
arch_minimum_kernel=2.6.32
# Check if CFLAGS allows compiler to use ebp register in inline assembly.
AC_CACHE_CHECK([if compiler flags allows ebp in inline assembly],
libc_cv_can_use_register_asm_ebp, [

2
sysdeps/unix/sysv/linux/x86_64/64/configure vendored
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@ -1,8 +1,6 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/unix/sysv/linux/x86_64/64.
arch_minimum_kernel=2.6.32
test -n "$libc_cv_slibdir" ||
case "$prefix" in
/usr | /usr/)

2
sysdeps/unix/sysv/linux/x86_64/64/configure.ac
View File

@ -1,6 +1,4 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/x86_64/64.
arch_minimum_kernel=2.6.32
LIBC_SLIBDIR_RTLDDIR([lib64], [lib64])