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Increase minimum Linux kernel version to 2.6.32.

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This patch increases the minimum Linux kernel version for glibc to
2.6.32, as discussed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2014-01/msg00511.html>.

This patch just does the minimal change to arch_minimum_kernel
settings (and LIBC_LINUX_VERSION, which determines the minimum kernel
headers version, as it doesn't make sense for that to be older than
the minimum kernel that can be used at runtime).  Followups would be
expected to do, roughly and not necessarily precisely in this order:

* Remove __LINUX_KERNEL_VERSION checks in kernel-features.h files
  where those checks are always true / always false for kernels 2.6.32
  and above.

* Otherwise simplify/improve conditionals in those files (for example,
  where defining once in the main file then undefining in
  architecture-specific files makes things clearer than having lots of
  separate definitions of the same macro), possibly fixing in the
  process cases where a macro should optimally have been defined for a
  given architecture but wasn't.  (In the review in preparation for
  this version increase I checked what the right conditions should be
  for all macros in the main kernel-features.h whose definitions there
  would have been affected by the increase - but I only fixed that
  subset of the issues found where --enable-kernel=2.6.32 would have
  caused a kernel feature to be wrongly assumed to be present, not any
  cases where a feature is not assumed but could be assumed.)

* Remove conditionals on __ASSUME_* where they can now be taken to be
  always-true, and the definitions when the macros are only used in
  Linux-specific files.

* Split more architectures out of the main kernel-features.h (like
  ex-ports architectures), once various of the architecture
  conditionals there have been eliminated so the new
  architecture-specific files are no larger than actually necessary.

Tested x86_64.

2014-03-27  Joseph Myers  <joseph@codesourcery.com>

	[BZ #9894]
	* sysdeps/unix/sysv/linux/configure.ac (LIBC_LINUX_VERSION):
	Change to 2.6.32.
	(arch_minimum_kernel): Change all 2.6.16 settings to 2.6.32.
	* sysdeps/unix/sysv/linux/configure: Regenerated.
	* sysdeps/unix/sysv/linux/microblaze/configure.ac: Remove file.
	* sysdeps/unix/sysv/linux/microblaze/configure: Likewise.
	* sysdeps/unix/sysv/linux/tile/configure.ac: Likewise.
	* sysdeps/unix/sysv/linux/tile/configure: Likewise.
	* README: Update reference to required Linux kernel version.
	* manual/install.texi (Linux): Update reference to required Linux
	kernel headers version.
	* INSTALL: Regenerated.
This commit is contained in:
Joseph Myers 2014-04-30 15:39:30 +00:00
parent 9a461d467f
commit d0f5b3f851
11 changed files with 47 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
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@ -1,5 +1,19 @@
2014-04-30 Joseph Myers <joseph@codesourcery.com>
[BZ #9894]
* sysdeps/unix/sysv/linux/configure.ac (LIBC_LINUX_VERSION):
Change to 2.6.32.
(arch_minimum_kernel): Change all 2.6.16 settings to 2.6.32.
* sysdeps/unix/sysv/linux/configure: Regenerated.
* sysdeps/unix/sysv/linux/microblaze/configure.ac: Remove file.
* sysdeps/unix/sysv/linux/microblaze/configure: Likewise.
* sysdeps/unix/sysv/linux/tile/configure.ac: Likewise.
* sysdeps/unix/sysv/linux/tile/configure: Likewise.
* README: Update reference to required Linux kernel version.
* manual/install.texi (Linux): Update reference to required Linux
kernel headers version.
* INSTALL: Regenerated.
* conform/data/stdlib.h-data [POSIX] (stddef.h): Do not allow
header inclusion.
[POSIX] (limits.h): Likewise.

2
INSTALL
View File

@ -389,7 +389,7 @@ Specific advice for GNU/Linux systems
=====================================
If you are installing the GNU C Library on GNU/Linux systems, you need
to have the header files from a 2.6.19.1 or newer kernel around for
to have the header files from a 2.6.32 or newer kernel around for
reference. These headers must be installed using `make
headers_install'; the headers present in the kernel source directory
are not suitable for direct use by the GNU C Library. You do not need

5
NEWS
View File

@ -9,7 +9,7 @@ Version 2.20
* The following bugs are resolved with this release:
6804, 12994, 13347, 13651, 14308, 14770, 15347, 15514, 15804, 15894,
6804, 9894, 12994, 13347, 13651, 14308, 14770, 15347, 15514, 15804, 15894,
16002, 16198, 16284, 16348, 16349, 16357, 16362, 16447, 16532, 16545,
16574, 16599, 16600, 16609, 16610, 16611, 16613, 16619, 16623, 16629,
16632, 16634, 16639, 16642, 16648, 16649, 16670, 16674, 16677, 16680,
@ -17,6 +17,9 @@ Version 2.20
16739, 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789,
16791, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16854.
* The minimum Linux kernel version that this version of the GNU C Library
can be used with is 2.6.32.
* Running the testsuite no longer terminates as soon as a test fails.
Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
with PASS or FAIL lines for individual tests. A summary of the results is

2
README
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@ -17,7 +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 2.6.16 or later.
requires Linux kernel version 2.6.32 or later.
Also note that the shared version of the libgcc_s library must be
installed for the pthread library to work correctly.

2
manual/install.texi
View File

@ -445,7 +445,7 @@ patches, although we try to avoid this.
@cindex kernel header files
If you are installing @theglibc{} on @gnulinuxsystems{}, you need to have
the header files from a 2.6.19.1 or newer kernel around for reference.
the header files from a 2.6.32 or newer kernel around for reference.
These headers must be installed using @samp{make headers_install}; the
headers present in the kernel source directory are not suitable for
direct use by @theglibc{}. You do not need to use that kernel, just have

34
sysdeps/unix/sysv/linux/configure vendored
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@ -174,33 +174,33 @@ $as_echo "$ac_cv_path_EGREP" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking installed Linux kernel header files" >&5
$as_echo_n "checking installed Linux kernel header files... " >&6; }
if ${libc_cv_linux2619+:} false; then :
if ${libc_cv_linux2632+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <linux/version.h>
#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < (2 *65536+ 6 *256+ 19) /* 2.6.19 */
#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < (2 *65536+ 6 *256+ 32) /* 2.6.32 */
eat flaming death
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "eat flaming death" >/dev/null 2>&1; then :
libc_cv_linux2619='TOO OLD!'
libc_cv_linux2632='TOO OLD!'
else
libc_cv_linux2619='2.6.19 or later'
libc_cv_linux2632='2.6.32 or later'
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_linux2619" >&5
$as_echo "$libc_cv_linux2619" >&6; }
if test "$libc_cv_linux2619" != '2.6.19 or later'; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_linux2632" >&5
$as_echo "$libc_cv_linux2632" >&6; }
if test "$libc_cv_linux2632" != '2.6.32 or later'; then
as_fn_error $? "GNU libc requires kernel header files from
Linux 2.6.19 or later to be installed before configuring.
Linux 2.6.32 or later to be installed before configuring.
The kernel header files are found usually in /usr/include/asm and
/usr/include/linux; make sure these directories use files from
Linux 2.6.19 or later. This check uses <linux/version.h>, so
Linux 2.6.32 or later. This check uses <linux/version.h>, so
make sure that file was built correctly when installing the kernel header
files. To use kernel headers not from /usr/include/linux, use the
configure option --with-headers." "$LINENO" 5
@ -216,37 +216,37 @@ test -n "$arch_minimum_kernel" ||
case "$machine" in
i386*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
x86_64/x32)
arch_minimum_kernel=3.4.0
;;
powerpc/powerpc32*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
s390/s390-32)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
s390/s390-64)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
sh*)
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
libc_cv_gcc_unwind_find_fde=yes
;;
sparc/sparc64*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
sparc*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
*)
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
esac
if test -n "$minimum_kernel"; then

18
sysdeps/unix/sysv/linux/configure.ac
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@ -5,7 +5,7 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# existing system library, because we are the only system library.
inhibit_glue=yes
define([LIBC_LINUX_VERSION],[2.6.19])dnl
define([LIBC_LINUX_VERSION],[2.6.32])dnl
if test -n "$sysheaders"; then
OLD_CPPFLAGS=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
@ -41,37 +41,37 @@ test -n "$arch_minimum_kernel" ||
case "$machine" in
i386*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
x86_64/x32)
arch_minimum_kernel=3.4.0
;;
powerpc/powerpc32*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
s390/s390-32)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
s390/s390-64)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
sh*)
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
libc_cv_gcc_unwind_find_fde=yes
;;
sparc/sparc64*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
sparc*)
libc_cv_gcc_unwind_find_fde=yes
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
*)
arch_minimum_kernel=2.6.16
arch_minimum_kernel=2.6.32
;;
esac
if test -n "$minimum_kernel"; then

4
sysdeps/unix/sysv/linux/microblaze/configure vendored
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@ -1,4 +0,0 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/unix/sysv/linux/microblaze.
arch_minimum_kernel=2.6.30

4
sysdeps/unix/sysv/linux/microblaze/configure.ac
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@ -1,4 +0,0 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/microblaze.
arch_minimum_kernel=2.6.30

4
sysdeps/unix/sysv/linux/tile/configure vendored
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@ -1,4 +0,0 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/unix/sysv/linux/tile.
arch_minimum_kernel=2.6.32

4
sysdeps/unix/sysv/linux/tile/configure.ac
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@ -1,4 +0,0 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/tile.
arch_minimum_kernel=2.6.32