[Bug libc/13554] New: Remove support for pre-2.6 Linux kernels

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13554

             Bug #: 13554
           Summary: Remove support for pre-2.6 Linux kernels
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


I believe we no longer need to be concerned about use of new glibc on pre-2.6
Linux kernels, although Roland is less sure about removing that support
immediately.

Requiring 2.6 (final 2.6.0, not 2.6.0-test*) would allow, most simply, changing
the arch_minimum_kernel defaults in sysdeps/unix/sysv/linux/configure.in to
2.6.0; that would get the benefits for any user configuring without
--enable-kernel, although not the benefits of cleaner glibc internals.  It
would then be possible to clean things up incrementally: where __ASSUME_*
macros are defined in kernel-features.h for 2.6.0 or before (or for 2.6.1 or
before where the only reason for a 2.6.1 conditional is 2.6.0-test* kernels
without the feature) they could be defined unconditionally (or conditional only
on the architecture in some cases).  And if a feature was present in 2.6.0 on
all architectures, conditionals on the relevant __ASSUME_* in Linux-specific
code can be removed, along with the macro definition if it's not tested outside
Linux-specific code.

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