diff options
Diffstat (limited to 'arch/arm/mm/fault-armv.c')
| -rw-r--r-- | arch/arm/mm/fault-armv.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c index fbfa26058442..81d0b8772de3 100644 --- a/arch/arm/mm/fault-armv.c +++ b/arch/arm/mm/fault-armv.c @@ -17,11 +17,13 @@ #include <linux/init.h> #include <linux/pagemap.h> +#include <asm/bugs.h> #include <asm/cacheflush.h> +#include <asm/cachetype.h> #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 @@ -37,7 +39,7 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address) 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)) @@ -55,15 +57,20 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long 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; @@ -193,7 +200,7 @@ void __init check_writebuffer_bugs(void) 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); @@ -214,7 +221,7 @@ void __init check_writebuffer_bugs(void) if (v) { printk("failed, %s\n", reason); - shared_pte_mask |= L_PTE_BUFFERABLE; + shared_pte_mask = L_PTE_MT_UNCACHED; } else { printk("ok\n"); } |