Red Hat Bugzilla – Bug 438230
ia64: suspecious compile warning in brew
Last modified: 2013-08-05 21:43:39 EDT
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):
Steps to Reproduce:
1. Run -86.el5 through brew
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
upstream commit 091062284c05d13b3393f4fcfcedc0f52cb948b4 will fix this.
Luming -- do you know what srlz.d does?
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.
thanks for the finding, I will post it .
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
You can download this test kernel from http://people.redhat.com/dzickus/el5
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
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