[PATCH 2.4.34-pre1] gcc4 fix for UP sparc64

[Mikael Pettersson <mikpe@it.uu.se>]

This patch fixes an invalid-lvalue error when compiling a
2.4.34-pre1 kernel on sparc64 with gcc-4.1.1. The kernel
must be configured with CONFIG_SMP=n for the error to trigger.
(I didn't save the error message, sorry.)

A kernel compiled with gcc-4.1.1 boots fine on my Ultra5
and can rebuild itself, and generally seems no less solid
than the 2.4.33 I compiled with gcc-3.4.6.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>

--- linux-2.4.34-pre1/arch/sparc64/mm/init.c.~1~	2004-11-17 18:36:41.000000000 +0100
+++ linux-2.4.34-pre1/arch/sparc64/mm/init.c	2006-08-20 20:52:20.000000000 +0200
@@ -95,7 +95,7 @@ int do_check_pgt_cache(int low, int high
                                 if (page2)
                                         page2->next_hash = page->next_hash;
                                 else
-                                        (struct page *)pgd_quicklist = page->next_hash;
+                                        pgd_quicklist = (unsigned long *)page->next_hash;
                                 page->next_hash = NULL;
                                 page->pprev_hash = NULL;
                                 pgd_cache_size -= 2;
-
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