#include <asm/pgtable.h>
#include <asm/tlbflush.h>
+#include "mm.h"
+
static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE;
/*
if (!pfn_valid(pfn))
return;
+ /*
+ * The zero page is never written to, so never has any dirty
+ * cache lines, and therefore never needs to be flushed.
+ */
page = pfn_to_page(pfn);
+ if (page == ZERO_PAGE(0))
+ return;
+
mapping = page_mapping(page);
#ifndef CONFIG_SMP
if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
page = alloc_page(GFP_KERNEL);
if (page) {
unsigned long *p1, *p2;
- pgprot_t prot = __pgprot(L_PTE_PRESENT|L_PTE_YOUNG|
- L_PTE_DIRTY|L_PTE_WRITE|
- L_PTE_MT_BUFFERABLE);
+ pgprot_t prot = __pgprot_modify(PAGE_KERNEL,
+ L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE);
p1 = vmap(&page, 1, VM_IOREMAP, prot);
p2 = vmap(&page, 1, VM_IOREMAP, prot);