[PATCH v12 1/6] drm: Add arch arm64 for drm_clflush_virt_range

[Matthew Wilcox]

On Fri, Feb 25, 2022 at 06:42:37PM +0000, Tvrtko Ursulin wrote:
> Matthew, what do you think fix for this build warning on h8300 and s390 should be? Or perhaps a build environment issue with kernel test robot?

I'd suggest this should do the job:

+++ b/include/linux/cacheflush.h
@@ -4,6 +4,8 @@

 #include <asm/cacheflush.h>

+struct folio;
+
 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO
 void flush_dcache_folio(struct folio *folio);