Require Linux kernel 3.2 or later on x86 / x86_64.

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.

1 files changed, 4 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 5558ca31d8..2a1e85108d 100644
--- a/NEWS
+++ b/NEWS
@@ -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,