Re-enable posix_fallocate and posix_fadvise on AIX

[isidentical]

BPO	40212
Nosy	@aixtools, @isidentical
PRs	bpo-40212: Re-enable posix_fadvise and f_allocate on AIX #19403

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-07.01:50:21.634>
labels = ['library', '3.9']
title = 'Re-enable posix_fallocate and posix_fadvise on AIX'
updated_at = <Date 2020-04-07.02:12:10.313>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-04-07.02:12:10.313>
actor = 'BTaskaya'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-04-07.01:50:21.634>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 40212
keywords = ['patch']
message_count = 1.0
messages = ['365884']
nosy_count = 2.0
nosy_names = ['Michael.Felt', 'BTaskaya']
pr_nums = ['19403']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40212'
versions = ['Python 3.9']

Linked PRs

• gh-84393: Re-enable posix_fadvise and f_allocate on AIX #144784

[isidentical]

fallocate and fadvise was problematic in AIX because of a bug that presents at the time of 2014, which looks like resolved in 2016. I think we can safely re-enable those functions back. I've tested this patch on AIX 7.2 and it works, this patch will also require pre-testing of buildbots.

http://www-01.ibm.com/support/docview.wss?uid=isg1IV56170