ARM: cacheflush: use -ishst dsb variant for ensuring flush completion

flush_cache_vmap contains a dsb to ensure that any cacheflushing
operations to flush out newly written ptes have completed.

This patch adds the -ishst option to the dsb, since that is all that is
required for completing cacheflushing in the inner-shareable domain.

Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index 17d0ae8..04d7326 100644 (file)
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -352,7 +352,7 @@ static inline void flush_cache_vmap(unsigned long start, unsigned long end)
                 * set_pte_at() called from vmap_pte_range() does not
                 * have a DSB after cleaning the cache line.
                 */
-               dsb();
+               dsb(ishst);
 }
 
 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)