linux-kernel - Re: PS3: trouble with SPARSEMEM

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Date:	Thu, 6 Dec 2007 08:41:31 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Geoff Levand <geoffrey.levand@...sony.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, miltonm@....com,
	clameter@....com, apw@...dowen.org, linux-kernel@...r.kernel.org,
	y-goto@...fujitsu.com
Subject: Re: PS3: trouble with SPARSEMEM_VMEMMAP and kexec

On Wed, 5 Dec 2007, Geoff Levand wrote:
> Andrew Morton wrote:
> > On Wed, 5 Dec 2007 10:52:48 +0100 (CET)
> > Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com> wrote:
> > 
> >> --------------------------------------------------------------------------------
> >> Subject: sparsemem: sparse_add_one_section() may fail to allocate memory
> >> 
> >> sparsemem: sparse_add_one_section() may fail to allocate memory, and must check
> >> whether the allocation succeeded before proceeding to touch the allocated
> >> memory.
> >> 
> >> From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
> >> 
> >> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
> >> ---
> >> FIXME There are still some possible memory leaks in sparse_add_one_section():
> >>   - usemap is never deallocated
> >>   - __kfree_section_memmap() is a not yet implemented dummy
> > 
> > I already had
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc4/2.6.24-rc4-mm1/broken-out/mm-sparsec-improve-the-error-handling-for-sparse_add_one_section.patch
> > and
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc4/2.6.24-rc4-mm1/broken-out/mm-sparsec-check-the-return-value-of-sparse_index_alloc.patch
> > 
> > queued.  Do they fix the problem, and should they be merged in 2.6.24?
> 
> No, a quick test shows it just panics in a different place.  Geert's
> patch does also.

What do you mean, that it still paniced after my patch?

The kernel did boot succesfully for me when passing ps3fb=48M. Userspace saw 58
MiB (128 MiB - kernelsize - 48 MiB(ps3fb)).

I did not try kexec, though.

With kind regards,
 
Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
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