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Diffstat (limited to 'arch/x86/mm/ioremap.c')
-rw-r--r--arch/x86/mm/ioremap.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 804de18abcc..71bb3159031 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -149,7 +149,8 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
* Don't allow anybody to remap normal RAM that we're using..
*/
for (pfn = phys_addr >> PAGE_SHIFT;
- (pfn << PAGE_SHIFT) < last_addr; pfn++) {
+ (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK);
+ pfn++) {
int is_ram = page_is_ram(pfn);
@@ -176,11 +177,11 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
/*
* Do not fallback to certain memory types with certain
* requested type:
- * - request is uncached, return cannot be write-back
- * - request is uncached, return cannot be write-combine
+ * - request is uc-, return cannot be write-back
+ * - request is uc-, return cannot be write-combine
* - request is write-combine, return cannot be write-back
*/
- if ((prot_val == _PAGE_CACHE_UC &&
+ if ((prot_val == _PAGE_CACHE_UC_MINUS &&
(new_prot_val == _PAGE_CACHE_WB ||
new_prot_val == _PAGE_CACHE_WC)) ||
(prot_val == _PAGE_CACHE_WC &&
@@ -201,6 +202,9 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
default:
prot = PAGE_KERNEL_NOCACHE;
break;
+ case _PAGE_CACHE_UC_MINUS:
+ prot = PAGE_KERNEL_UC_MINUS;
+ break;
case _PAGE_CACHE_WC:
prot = PAGE_KERNEL_WC;
break;
@@ -255,7 +259,16 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
*/
void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
{
- return __ioremap_caller(phys_addr, size, _PAGE_CACHE_UC,
+ /*
+ * Ideally, this should be:
+ * pat_wc_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS;
+ *
+ * Till we fix all X drivers to use ioremap_wc(), we will use
+ * UC MINUS.
+ */
+ unsigned long val = _PAGE_CACHE_UC_MINUS;
+
+ return __ioremap_caller(phys_addr, size, val,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_nocache);