Bug 11908

Summary:	linux-2.6.28-rc2 regression : oprofile doesnt work anymore
Product:	Other	Reporter:	Rafael J. Wysocki (rjw)
Component:	Other	Assignee:	other_other
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	andi-bz, penberg, rric
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.28-rc2	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	11808

Description Rafael J. Wysocki 2008-10-30 15:03:18 UTC

Subject    : linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?
Submitter  : Eric Dumazet <dada1@cosmosbay.com>
Date       : 2008-10-30 18:01
References : http://marc.info/?l=linux-kernel&m=122539004100532&w=4

This entry is being used for tracking a regression from 2.6.27.  Please don't
close it until the problem is fixed in the mainline.

Comment 1 Rafael J. Wysocki 2008-10-31 15:38:27 UTC

Notify-Also : "Pekka Enberg" <penberg@cs.helsinki.fi>
Notify-Also : Jesper Dangaard Brouer <hawk@comx.dk>

Comment 2 Robert Richter 2008-11-05 07:26:20 UTC

Bug has been introduced with the arch perfmon patcheset. See here:

http://marc.info/?l=linux-kernel&m=122582283607241&w=4

Comment 3 Rafael J. Wysocki 2008-11-09 10:00:27 UTC

Notify-Also : Robert Richter <robert.richter@amd.com>

Comment 4 Rafael J. Wysocki 2008-11-09 10:35:03 UTC

Bisected-To : c493756..5951290

Comment 5 Rafael J. Wysocki 2008-11-09 10:36:43 UTC

First-Bad-Commit : c493756e2a8a78bcaae30668317890dcfe86e7c3

Comment 6 Robert Richter 2008-11-10 02:22:35 UTC

Fixed with:

commit 7c64ade53a6f977d73f16243865c42ceae999aea
Author: Andi Kleen <andi@firstfloor.org>
Date:   Fri Nov 7 14:02:49 2008 +0100

    oprofile: Fix p6 counter overflow check
    
    Fix the counter overflow check for CPUs with counter width > 32
    
    I had a similar change in a different patch that I didn't submit
    and I didn't notice the problem earlier because it was always
    tested together.
    
    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    Signed-off-by: Robert Richter <robert.richter@amd.com>


Upstream in v2.6.28-rc4