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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch 1/5] vmalloc: do not check for freed locks on user maps
Date: Thu, 6 Mar 2008 13:34:58 +1100
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       Andrew Morton <akpm@linux-foundation.org>, Greg KH <greg@kroah.com>,
       Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>
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On Thursday 06 March 2008 10:31, Thomas Gleixner wrote:
> On Thu, 6 Mar 2008, Nick Piggin wrote:

> > This is the kernel mapping. The user mapping is unmapped when
> > the userspace munmaps.
>
> Ok, my misinterpretation of that flag. Is the user space unmap in the
> same code path ? If yes, how can it be distinguished from the kernel
> space unmap ?

The flag I added so that the vmap can be passed to remap_vmalloc_range.
There were a couple of places at one point that were not zeroing out
the vmalloced memory correctly, so this just helps ensure we don't leak
data.

Userspace unmap is unmap_vmas and related code in mm/memory.c.