linux-kernel - Re: [PATCH] mm: fix lazy vmap purging (use-after-free error)

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Message-Id: <20090223123045.aa993f8f.akpm@linux-foundation.org>
Date:	Mon, 23 Feb 2009 12:30:45 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	nickpiggin@...oo.com.au, vegard.nossum@...il.com, mingo@...e.hu,
	stable@...nel.org, npiggin@...e.de, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix lazy vmap purging (use-after-free error)

On Mon, 23 Feb 2009 12:12:36 -0800
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> > 
> > As I suggested before, please add a new state variable which is private
> > to your subsystem.  That way it remains isolated from other subsystems.
> 
> OK, so my thought would be to have a function call into RCU from either
> init_post() or from rest_init().  This function would then set a variable
> private to RCU.
> 
> Seem reasonable?
> 

If that flag will only be used by one flavour of RCU then that would be
a good way to go.

Otherwise, heck, just make it a global variable with a well-chosen name
and write to it directly.  Simple, perfectly clear and understandable..

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