[SPARC32] NULL pointer derefference

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Hi All,

Unfortunatly Sparc32 sun4c low level memory management apears to be incompatible with commit b6a2fea39318e43fee84fa7b0b90d68bed92d2ba
mm: variable length argument support.

For some reason, this commit corrupts the memory used by the low level context/pte handling ring buffers in arch/sparc/mm/sun4c (in add_ring_ordered, head->next becomes set to a NULL pointer).

I had a quick look at http://www.linux-mm.org to see if there were any diagrams that show what is going on in the memory management systems, to see if there was something that I could use to help me work out what is going on, but I could not see any.

Can any one help?

Regards
	Mark Fortescue.
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