powerpc: Add a local_flush_tlb_page to handle kmap_atomic invalidates

The tlb invalidates in kmap_atomic/kunmap_atomic can be called from
IRQ context, however they are only local invalidates (on the processor
that the kmap was called on).  In the future we want to use IPIs to
do tlb invalidates this causes issue since flush_tlb_page() is considered
a broadcast invalidate.

Add local_flush_tlb_page() as a non-broadcast invalidate and use it in
kmap_atomic() since we don't have enough information in the
flush_tlb_page() call to determine its local.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index 91c589520c0..7dc52eca8b6 100644
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -85,7 +85,7 @@ static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgpro
 	BUG_ON(!pte_none(*(kmap_pte-idx)));
 #endif
 	__set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
-	flush_tlb_page(NULL, vaddr);
+	local_flush_tlb_page(vaddr);
 
 	return (void*) vaddr;
 }
@@ -113,7 +113,7 @@ static inline void kunmap_atomic(void *kvaddr, enum km_type type)
 	 * this pte without first remap it
 	 */
 	pte_clear(&init_mm, vaddr, kmap_pte-idx);
-	flush_tlb_page(NULL, vaddr);
+	local_flush_tlb_page(vaddr);
 #endif
 	pagefault_enable();
 }