Re: [PATCH] Add kmemleak annotations to lmb.c

[David Miller <davem@davemloft.net>]

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 14 Aug 2009 17:56:40 +1000

> On Thu, 2009-08-13 at 16:40 +0100, Catalin Marinas wrote:
>> On Thu, 2009-08-13 at 13:01 +1000, Michael Ellerman wrote:
>> > We don't actually want kmemleak to track the lmb allocations, so we
>> > pass min_count as 0. However telling kmemleak about lmb allocations
>> > allows it to scan that memory for pointers to other memory that is
>> > tracked by kmemleak, ie. slab allocations etc.
>> 
>> Looks alright to me (though I haven't tested it). You can add a
>> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> 
> Actually, Milton pointed to me that we may not want to allow all
> LMB chunks to be scanned by kmemleaks, things like the DART hole
> that's taken out of the linear mapping for example may need to
> be avoided, though I'm not sure what would be the right way to
> do it.

I think that annotating LMB for kmemleak may be more problems
that it's worth.

I can't think of any specific problems like the DART thing on
sparc64, but I'm sure that as soon as someone starts trying
to test this they'll run into one thing or another :-)