Merge branch 'perf-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel...

[safe/jmp/linux-2.6] / arch / x86 / mm / iomap_32.c

diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index bff0c90..84e236c 100644 (file)
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -21,16 +21,39 @@
 #include <linux/module.h>
 #include <linux/highmem.h>
 
-int is_io_mapping_possible(resource_size_t base, unsigned long size)
+static int is_io_mapping_possible(resource_size_t base, unsigned long size)
 {
-#ifndef CONFIG_X86_PAE
+#if !defined(CONFIG_X86_PAE) && defined(CONFIG_PHYS_ADDR_T_64BIT)
        /* There is no way to map greater than 1 << 32 address without PAE */
        if (base + size > 0x100000000ULL)
                return 0;
 #endif
        return 1;
 }
-EXPORT_SYMBOL_GPL(is_io_mapping_possible);
+
+int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot)
+{
+       unsigned long flag = _PAGE_CACHE_WC;
+       int ret;
+
+       if (!is_io_mapping_possible(base, size))
+               return -EINVAL;
+
+       ret = io_reserve_memtype(base, base + size, &flag);
+       if (ret)
+               return ret;
+
+       *prot = __pgprot(__PAGE_KERNEL | flag);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(iomap_create_wc);
+
+void
+iomap_free(resource_size_t base, unsigned long size)
+{
+       io_free_memtype(base, base + size);
+}
+EXPORT_SYMBOL_GPL(iomap_free);
 
 void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
 {
@@ -39,6 +62,7 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
 
        pagefault_disable();
 
+       debug_kmap_atomic(type);
        idx = type + KM_TYPE_NR * smp_processor_id();
        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
        set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
@@ -72,7 +96,6 @@ iounmap_atomic(void *kvaddr, enum km_type type)
        unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
        enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
 
-       debug_kmap_atomic(type);
        /*
         * Force other mappings to Oops if they'll try to access this pte
         * without first remap it.  Keeping stale mappings around is a bad idea
@@ -82,7 +105,6 @@ iounmap_atomic(void *kvaddr, enum km_type type)
        if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
                kpte_clear_flush(kmap_pte-idx, vaddr);
 
-       arch_flush_lazy_mmu_mode();
        pagefault_enable();
 }
 EXPORT_SYMBOL_GPL(iounmap_atomic);