linux-kernel - Re: [PATCH RESEND 0/3] tracing/mm: Fix suspicious rcu_dereference

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Date:	Tue, 12 May 2015 16:03:51 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Shreyas B Prabhu <shreyas@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	aneesh.kumar@...ux.vnet.ibm.com, paulmck@...ux.vnet.ibm.com,
	preeti@...ux.vnet.ibm.com, mgorman@...e.de, namhyung@...nel.org,
	lizf@...fujitsu.com, acme@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RESEND 0/3] tracing/mm: Fix suspicious
 rcu_dereference_check() usage warnings

On Tue, 12 May 2015 12:59:26 +0530
Shreyas B Prabhu <shreyas@...ux.vnet.ibm.com> wrote:

> Hi Steven,
> On closer look, there is no particular maintainer who picks changes to
> this file. Can you please pick these up?

Perhaps Andrew Morton?

No problem, I can take these too.

-- Steve

> 
> On Friday 08 May 2015 10:50 PM, Shreyas B. Prabhu wrote:
> > Since tracepoints use RCU for protection, they must not be called on
> > offline cpus. Running with LOCKDEP enabled discovered few scenarios
> > where trace points were called on offline cpus. These patches fix
> > this by converting these trace events into conditonal trace events
> > where condition is cpu_online(smp_processor_id())
> > 
> > Previous posting of the patchset can be found here:
> > https://lkml.org/lkml/2015/4/28/512
> > 
> > This resend CCs people who added/edited the trace events in question.
> > 
> > Shreyas B. Prabhu (3):
> >   tracing/mm: Don't trace kmem_cache_free on offline cpus
> >   tracing/mm: Don't trace mm_page_free on offline cpus
> >   tracing/mm: Don't trace mm_page_pcpu_drain on offline cpus
> > 
> >  include/trace/events/kmem.h | 26 ++++++++++++++++++++++----
> >  1 file changed, 22 insertions(+), 4 deletions(-)
> > 

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