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No functional change.
Followup to r1486454.
Backport of r1497588.


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core: Support the SINGLE_LISTEN_UNSERIALIZED_ACCEPT optimization
on Linux kernel versions 3.x and above.

PR: 55121
Submitted by: Bradley Heilbrun <apache heilbrun.org>
Reviewed by: trawick

Submitted by: trawick
Reviewed/backported by: jim


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const goodness with nasty strrchr and strchr functions
(resolve warning in maintainer mode)

Submitted by: trawick
Reviewed/backported by: jim


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(Backport r1495270, r1495665, r1495666)


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mod_cache_socache: Make sure the CacheSocacheMaxSize directive is merged
correctly.

Submitted by: minfrin
Reviewed/backported by: jim


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fix doc for ap_pregsub_ex() return code


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Document apxs -p paramter.

Submitted by: Jan Kaluža <jkaluza@redhat.com>
Reviewed by: covener




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be used uninitialized in this function"
(which is correct here).

Backport of r1494536 form trunk.


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Backport of r1481677, r1494317, r1488496.
Reviewed by: fuankg, gsmith, minfrin


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