1 files changed, 8 insertions, 4 deletions

diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 2e2d70d13ff6..d2ee28156743 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -168,11 +168,15 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 #endif
 
-#define PGD_T_LOG2      ffz(~sizeof(pgd_t))
-#define PMD_T_LOG2      ffz(~sizeof(pmd_t))
-#define PTE_T_LOG2      ffz(~sizeof(pte_t))
+#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
+#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.