iova: Make has_iova_flush_queue() private

Function has_iova_flush_queue() has no users outside iova.c, so make it
private.
Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/1609940111-28563-2-git-send-email-john.garry@huawei.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iova.c

@@ -55,7 +55,7 @@ init_iova_domain(struct iova_domain *iovad, unsigned long granule,
 }
 EXPORT_SYMBOL_GPL(init_iova_domain);
 
-bool has_iova_flush_queue(struct iova_domain *iovad)
+static bool has_iova_flush_queue(struct iova_domain *iovad)
 {
 	return !!iovad->fq;
 }

include/linux/iova.h

@@ -153,7 +153,6 @@ struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
 	unsigned long start_pfn);
-bool has_iova_flush_queue(struct iova_domain *iovad);
 int init_iova_flush_queue(struct iova_domain *iovad,
 			  iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
@@ -223,11 +222,6 @@ static inline void init_iova_domain(struct iova_domain *iovad,
 {
 }
 
-static inline bool has_iova_flush_queue(struct iova_domain *iovad)
-{
-	return false;
-}
-
 static inline int init_iova_flush_queue(struct iova_domain *iovad,
 					iova_flush_cb flush_cb,
 					iova_entry_dtor entry_dtor)