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-rw-r--r--arch/arc/mm/ioremap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
index 0ee75aca6e10..712c2311daef 100644
--- a/arch/arc/mm/ioremap.c
+++ b/arch/arc/mm/ioremap.c
@@ -94,7 +94,7 @@ void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
EXPORT_SYMBOL(ioremap_prot);
-void iounmap(const void __iomem *addr)
+void iounmap(const volatile void __iomem *addr)
{
/* weird double cast to handle phys_addr_t > 32 bits */
if (arc_uncached_addr_space((phys_addr_t)(u32)addr))