Hugepages demand paging V2 [4/8]: ia64 arch modifications

[Christoph Lameter]

Changelog
	* Provide huge_update_mmu_cache that flushes an huge page from the icache if necessary
	* flush_dcache_page does nothing on ia64 and thus does not need to be extended
	* Built and tested

Index: linux-2.6.9/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.9.orig/arch/ia64/mm/init.c	2004-10-21 12:01:21.000000000 -0700
+++ linux-2.6.9/arch/ia64/mm/init.c	2004-10-25 15:32:35.000000000 -0700
@@ -95,6 +95,26 @@
 	set_bit(PG_arch_1, &page->flags);	/* mark page as clean */
 }

+void
+huge_update_mmu_cache (struct vm_area_struct *vma, unsigned long vaddr, pte_t pte)
+{
+	unsigned long addr;
+	struct page *page;
+
+	if (!pte_exec(pte))
+		return;				/* not an executable page... */
+
+	page = pte_page(pte);
+	/* don't use VADDR: it may not be mapped on this CPU (or may have just been flushed): */
+	addr = (unsigned long) page_address(page);
+
+	if (test_bit(PG_arch_1, &page->flags))
+		return;				/* i-cache is already coherent with d-cache */
+
+	flush_icache_range(addr, addr + HPAGE_SIZE);
+	set_bit(PG_arch_1, &page->flags);	/* mark page as clean */
+}
+
 inline void
 ia64_set_rbs_bot (void)
 {
Index: linux-2.6.9/include/asm-ia64/pgtable.h
===================================================================
--- linux-2.6.9.orig/include/asm-ia64/pgtable.h	2004-10-21 12:01:24.000000000 -0700
+++ linux-2.6.9/include/asm-ia64/pgtable.h	2004-10-25 15:31:39.000000000 -0700
@@ -481,7 +481,8 @@
  * information.  However, we use this routine to take care of any (delayed) i-cache
  * flushing that may be necessary.
  */
-extern void update_mmu_cache (struct vm_area_struct *vma, unsigned long vaddr, pte_t pte);
+extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr, pte_t pte);
+extern void huge_update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr, pte_t pte);

 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 /*

-
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