[MIPS] Gcc 3.3 build fixes.

Work around gcc 3.3's unability to evaluate that certain expressions indeed
are constant.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/mm/init.c

@@ -26,6 +26,7 @@
 #include <linux/proc_fs.h>
 #include <linux/pfn.h>
 
+#include <asm/asm-offsets.h>
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
 #include <asm/cpu.h>
@@ -498,7 +499,13 @@ unsigned long pgd_current[NR_CPUS];
  * different layout ...
  */
 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
-pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
+ * are constants.  So we use the variants from asm-offset.h until that gcc
+ * will officially be retired.
+ */
+pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
 #ifdef CONFIG_64BIT
 #ifdef MODULE_START
 pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);

include/asm-mips/pgtable.h

@@ -172,7 +172,11 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 #define PMD_T_LOG2	(__builtin_ffs(sizeof(pmd_t)) - 1)
 #define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)
 
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+/*
+ * We used to declare this array with size but gcc 3.3 and older are not able
+ * to find that this expression is a constant, so the size is dropped.
+ */
+extern pgd_t swapper_pg_dir[];
 
 /*
  * The following only work if pte_present() is true.