[PATCH] [POWERPC] Fix oops related to 4xx flush_tlb_page modification

[Kumar Gala]

kmap_atomic calls flush_tlb_page with a NULL VMA and thus we end
up dereferencing a NULL pointer to try and get the context.id.

If the VMA is null use the global pid value of 0.

---
 include/asm-powerpc/tlbflush.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/asm-powerpc/tlbflush.h b/include/asm-powerpc/tlbflush.h
index e7b4c0d..5c91081 100644
--- a/include/asm-powerpc/tlbflush.h
+++ b/include/asm-powerpc/tlbflush.h
@@ -44,13 +44,13 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
 static inline void flush_tlb_page(struct vm_area_struct *vma,
 				  unsigned long vmaddr)
 {
-	_tlbie(vmaddr, vma->vm_mm->context.id);
+	_tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
 }

 static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
 					 unsigned long vmaddr)
 {
-	_tlbie(vmaddr, vma->vm_mm->context.id);
+	_tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
 }

 static inline void flush_tlb_range(struct vm_area_struct *vma,
-- 
1.5.3.3