[PATCH] hugepage: Move hugetlb_free_pgd_range() prototype to hugetlb.h

The optional hugepage callback, hugetlb_free_pgd_range() is presently
implemented non-trivially only on ia64 (but I plan to add one for powerpc
shortly).  It has its own prototype for the function in asm-ia64/pgtable.h.
 However, since the function is called from generic code, it make sense for
its prototype to be in the generic hugetlb.h header file, as the protypes
other arch callbacks already are (prepare_hugepage_range(),
set_huge_pte_at(), etc.).  This patch makes it so.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-ia64/pgtable.h

@@ -505,9 +505,6 @@ extern struct page *zero_page_memmap_ptr;
 #define HUGETLB_PGDIR_SHIFT	(HPAGE_SHIFT + 2*(PAGE_SHIFT-3))
 #define HUGETLB_PGDIR_SIZE	(__IA64_UL(1) << HUGETLB_PGDIR_SHIFT)
 #define HUGETLB_PGDIR_MASK	(~(HUGETLB_PGDIR_SIZE-1))
-struct mmu_gather;
-void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
-		unsigned long end, unsigned long floor, unsigned long ceiling);
 #endif
 
 /*

include/linux/hugetlb.h

@@ -47,6 +47,10 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
 
 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
 #define hugetlb_free_pgd_range	free_pgd_range
+#else
+void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
+			    unsigned long end, unsigned long floor,
+			    unsigned long ceiling);
 #endif
 
 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE