#include <asm/pgtable.h>
#include <asm/tlbflush.h>
-static unsigned long shared_pte_mask = L_PTE_CACHEABLE;
+static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE;
/*
* We take the easy way out of this problem - we make the
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte, entry;
- int ret = 0;
+ int ret;
pgd = pgd_offset(vma->vm_mm, address);
if (pgd_none(*pgd))
pte = pte_offset_map(pmd, address);
entry = *pte;
+ /*
+ * If this page is present, it's actually being shared.
+ */
+ ret = pte_present(entry);
+
/*
* If this page isn't present, or is already setup to
* fault (ie, is old), we can safely ignore any issues.
*/
- if (pte_present(entry) && pte_val(entry) & shared_pte_mask) {
+ if (ret && (pte_val(entry) & L_PTE_MT_MASK) != shared_pte_mask) {
flush_cache_page(vma, address, pte_pfn(entry));
- pte_val(entry) &= ~shared_pte_mask;
+ pte_val(entry) &= ~L_PTE_MT_MASK;
+ pte_val(entry) |= shared_pte_mask;
set_pte_at(vma->vm_mm, address, pte, entry);
flush_tlb_page(vma, address);
- ret = 1;
}
pte_unmap(pte);
return ret;
unsigned long *p1, *p2;
pgprot_t prot = __pgprot(L_PTE_PRESENT|L_PTE_YOUNG|
L_PTE_DIRTY|L_PTE_WRITE|
- L_PTE_BUFFERABLE);
+ L_PTE_MT_BUFFERABLE);
p1 = vmap(&page, 1, VM_IOREMAP, prot);
p2 = vmap(&page, 1, VM_IOREMAP, prot);
if (v) {
printk("failed, %s\n", reason);
- shared_pte_mask |= L_PTE_BUFFERABLE;
+ shared_pte_mask = L_PTE_MT_UNCACHED;
} else {
printk("ok\n");
}