Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / arch / mips / mm / highmem.c

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index dd5e2e3..0c54437 100644 (file)
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -83,6 +83,27 @@ void __kunmap_atomic(void *kvaddr, enum km_type type)
        preempt_check_resched();
 }
 
+#ifndef CONFIG_LIMITED_DMA
+/*
+ * This is the same as kmap_atomic() but can map memory that doesn't
+ * have a struct page associated with it.
+ */
+void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
+{
+       enum fixed_addresses idx;
+       unsigned long vaddr;
+
+       inc_preempt_count();
+
+       idx = type + KM_TYPE_NR*smp_processor_id();
+       vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+       set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot));
+       flush_tlb_one(vaddr);
+
+       return (void*) vaddr;
+}
+#endif /* CONFIG_LIMITED_DMA */
+
 struct page *__kmap_atomic_to_page(void *ptr)
 {
        unsigned long idx, vaddr = (unsigned long)ptr;