ARM: mm: remove redundant dsb() prior to range TLB invalidation

The kernel TLB range invalidation functions already contain dsb
instructions before and after the maintenance, so there is no need to
introduce additional barriers.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7f9b1798c6cf12f08e55496b27082722e16a30f3..0c17f69a8286e6f9d4646028b9f4b615ad018e08 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -455,7 +455,6 @@ static void __dma_remap(struct page *page, size_t size, pgprot_t prot)
        unsigned end = start + size;
 
        apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot);
-       dsb();
        flush_tlb_kernel_range(start, end);
 }