Re: WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x290/0x2fa()

From: Fabio Coatti
Date: Wed Jul 09 2014 - 14:41:31 EST

In data lunedì 7 luglio 2014 13:47:47, Greg Kroah-Hartman ha scritto:
> On Mon, Jul 07, 2014 at 10:32:56PM +0200, Fabio Coatti wrote:
> > I'm seeing this message in latest kernels (this is from 3.15.4, but I have
> > same
> > message starting from 3.15.0, IIRC):
> So 3.14.0 didn't show this?
> If so, can you run 'git bisect' between those two kernel versions to try
> to track down the issue?
> thanks,
> greg k-h
ok, I tried to bisect as suggested and got the commit reported below. However
I'm not really sure to have got the right one, as one kernel refused to
compile during the last steps. However I post here the result, maybe they can
be useful.
Tomorrow I can retry the whole process again starting from different commits.

b9e1ab6d4c0582cad97699285a6b3cf992251b00 is the first bad commit
commit b9e1ab6d4c0582cad97699285a6b3cf992251b00
Author: Stephane Eranian <eranian@xxxxxxxxxx>
Date: Tue Feb 11 16:20:12 2014 +0100

perf/x86/uncore: add SNB/IVB/HSW client uncore memory controller support

This patch adds a new uncore PMU for Intel SNB/IVB/HSW client
CPUs. It adds the Integrated Memory Controller (IMC) PMU. This
new PMU provides a set of events to measure memory bandwidth utilization.

The IMC on those processor is PCI-space based. This patch
exposes a new uncore PMU on those processor: uncore_imc

Two new events are defined:
- name: data_reads
- code: 0x1
- unit: 64 bytes
- number of full cacheline read requests to the IMC

- name: data_writes
- code: 0x2
- unit: 64 bytes
- number of full cacheline write requests to the IMC

Documentation available at:

Cc: mingo@xxxxxxx
Cc: acme@xxxxxxxxxx
Cc: ak@xxxxxxxxxxxxxxx
Cc: zheng.z.yan@xxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

:040000 040000 2d628022cbc4b8969a2ec311082053510cf6eed5
79b2a1cc3ed29e4820a5ae4221b4cf603c138887 M arch

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