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Bug 1566315

Summary: membarrier.2: Document membarrier(2) new syscall
Product: Red Hat Enterprise Linux 7 Reporter: Rafael Aquini <aquini>
Component: man-pages-overridesAssignee: Nikola Forró <nforro>
Status: CLOSED ERRATA QA Contact: Jan Houska <jhouska>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.6CC: djez, nforro, smoroney, vondruch
Target Milestone: rcKeywords: ManPageChange, Patch
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: man-pages-overrides-7.6.0-1.el7 Doc Type: No Doc Update
Doc Text:
undefined
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-10-30 11:34:51 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1560024    
Bug Blocks: 1592880    

Description Rafael Aquini 2018-04-12 03:57:31 UTC
Via bug 1560024 we're backporting the new system call MEMBARRIER(2), and as such its availability must be documented accordingly in the man pages.

Comment 7 Jan Houska 2018-08-17 12:30:04 UTC
VERIFIED

NEW PASS:
man-pages-overrides-7.6.1-3.el7

"""
# man  2 membarrier

MEMBARRIER(2)                                                                   Linux Programmer's Manual                                                                  MEMBARRIER(2)

NAME
       membarrier - issue memory barriers on a set of threads

SYNOPSIS
       #include <linux/membarrier.h>

       int membarrier(int cmd, int flags);

DESCRIPTION
       The  membarrier()  system call helps reducing the overhead of the memory barrier instructions required to order memory accesses on multi-core systems.  However, this system call
       is heavier than a memory barrier, so using it effectively is not as simple as replacing memory barriers with this system call, but requires understanding of the details below.
...
"""

OlD FAIL:
man-pages-overrides-7.5.2-1.el7  -- on RHEL-7.5-released

No output on man  2 membarrier present.

Comment 10 errata-xmlrpc 2018-10-30 11:34:51 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3254