From: Cody Ho <codyho@stanford.edu>
Subject: [PATCH] arm64: export dcache_clean_inval_poc for Apple DRM bring-up

Temporary Gravity early-alpha packaging workaround: appledrm is modular
and references this built-in ARM64 helper. Export it to GPL-compatible
modules without changing its implementation. Drop this patch when the
pinned downstream kernel carries the corresponding export or refactor.

Signed-off-by: Cody Ho <codyho@stanford.edu>
Assisted-By: OpenAI Codex (gpt-6-astra, gpt-5.6-sol)
---
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -84,6 +84,7 @@ void flush_dcache_page(struct page *page)
  * Additional functions defined in assembly.
  */
 EXPORT_SYMBOL(caches_clean_inval_pou);
+EXPORT_SYMBOL_GPL(dcache_clean_inval_poc);
 
 #ifdef CONFIG_ARCH_HAS_PMEM_API
 void arch_wb_cache_pmem(void *addr, size_t size)