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Bug 438230

Summary:	ia64: suspecious compile warning in brew
Product:	Red Hat Enterprise Linux 5	Reporter:	Don Zickus <dzickus>
Component:	kernel	Assignee:	Luming Yu <luyu>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	low	Docs Contact:
Priority:	low
Version:	5.2	CC:	dzickus, peterm
Target Milestone:	rc
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-01-20 20:24:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Don Zickus 2008-03-19 19:38:16 UTC

Description of problem:

When checking the build log diffs between -85.el5 and -86.el5, the following
warning popped up and looked interesting:

arch/ia64/kernel/head.S:###: Warning: Use of 'ldf.fill.nta' violates RAW
dependency 'CR[PTA]' (data)mm/mmap.
c: In function 'split_vma':

Went through the patch queue and could not find a likely culprit.  

Version-Release number of selected component (if applicable):
kernel-2.6.18-86.el5

How reproducible:


Steps to Reproduce:
1. Run -86.el5 through brew
2.
3.
  
Actual results:


Expected results:


Additional info:

Comment 1 Luming Yu 2008-03-20 08:48:15 UTC

Tried rpmbuild -ba -85.el5  as well as -86.el5.

I do see occurances of warning of ld.fill.nta violates RW, but not 
in function "split_vma.,,

The building box is: rhel5.2 beta with gcc version 4.1.2 20071124 (Red Hat
4.1.2-41).

Comment 2 Prarit Bhargava 2008-03-20 10:20:35 UTC

upstream commit 091062284c05d13b3393f4fcfcedc0f52cb948b4 will fix this.

Luming -- do you know what srlz.d does?

P.

Comment 3 Luming Yu 2008-03-24 03:05:34 UTC

srlz.d does data serialization. 
According to IPF SDM,Serialization is needed to ensure new values in PTA are
visible to the hardware Virtual Hash Page Table  (VHPT) walker before a
dependent instruction fetch or data access.

Comment 4 Luming Yu 2008-03-24 03:16:10 UTC

Prarit, 
thanks for the finding, I will post it .

Thanks,
Luming

Comment 6 RHEL Program Management 2008-04-08 18:59:08 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 8 Don Zickus 2008-07-18 20:07:04 UTC

in kernel-2.6.18-98.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 13 errata-xmlrpc 2009-01-20 20:24:44 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2009-0225.html