This is needed for the ppc32 /dev/oldmem driver of crash dump.
Signed-off-by: Dale Farnsworth <[EMAIL PROTECTED]>
---
include/asm-powerpc/highmem.h | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/include/asm-powerpc/highmem.h b/include/asm-powerpc/highmem.h
index f7b21ee..88d9e05 100644
--- a/include/asm-powerpc/highmem.h
+++ b/include/asm-powerpc/highmem.h
@@ -117,6 +117,24 @@ static inline void kunmap_atomic(void *kvaddr, enum
km_type type)
pagefault_enable();
}
+/* This is the same as kmap_atomic() but can map memory that doesn't
+ * have a struct page associated with it.
+ */
+static inline void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
+{
+ unsigned int idx;
+ unsigned long vaddr;
+
+ pagefault_disable();
+
+ idx = type + KM_TYPE_NR * smp_processor_id();
+ vaddr = KMAP_FIX_BEGIN + idx * PAGE_SIZE;
+ set_pte_at(&init_mm, vaddr, kmap_pte+idx, pfn_pte(pfn, kmap_prot));
+ flush_tlb_page(NULL, vaddr);
+
+ return (void*) vaddr;
+}
+
static inline struct page *kmap_atomic_to_page(void *ptr)
{
unsigned long idx, vaddr = (unsigned long) ptr;
--
1.5.3.4
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