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Requiring Linux 3.2 for glibc 2.24

As Linux 2.6.32 has been announced to reach end-of-line next month 
<>, I propose that for glibc 2.24 we 
require Linux 3.2 as the minimum kernel version when glibc is used on 
systems with the Linux kernel and there isn't already a more recent 
architecture-specific minimum.  This would continue to be the minimum 
until 3.2 reaches EOL (currently listed as May 2018 at 
<>).  3.2 would thus also be 
the minimum headers version as well as the minimum version at runtime.

This would eliminate every version-specific conditional in the 
architecture-independent kernel-features.h as well as those for alpha mips 
powerpc sh sparc tile x86_64 and some version-specific conditionals in 
headers for other architectures.  How this translates into simplifying 
other code varies, since some macros may still be undefined for some 
architectures (unconditionally or conditionally on a post-3.2 version), 
and some __ASSUME_* macros are tested in code also used on non-Linux 

Joseph S. Myers

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