mm: highmem: Add definitions for kmap_atomic_flush_unused
kmap_flush_unused does not flush kmap_atomic mappings which
are handled separately. Architectures may have use cases to require
these to be flushed. Add an option to let architectures define
kmap_atomic flushing to get rid of extra mappings.
Change-Id: I5a338ed9e215f0f0ad3ab58a3066d2f4c8ce3ba7
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index bb3f329..4c70716 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -39,6 +39,12 @@
void kmap_flush_unused(void);
+#ifdef CONFIG_ARCH_WANT_KMAP_ATOMIC_FLUSH
+void kmap_atomic_flush_unused(void);
+#else
+static inline void kmap_atomic_flush_unused(void) { }
+#endif
+
struct page *kmap_to_page(void *addr);
#else /* CONFIG_HIGHMEM */
@@ -80,6 +86,7 @@
#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
#define kmap_flush_unused() do {} while(0)
+#define kmap_atomic_flush_unused() do {} while (0)
#endif
#endif /* CONFIG_HIGHMEM */