ARM: mm: Export __sync_icache_dcache() for xen-privcmd

The xen-privcmd driver, which can be modular, calls set_pte_at() which in turn may call __sync_icache_dcache().

The call to __sync_icache_dcache() may be optimised out because it is conditional on !pte_special(), and xen-privcmd calls pte_mkspecial(). However, in a non-LPAE configuration there is no "special" bit and the call is really unconditional.

---
This is a 4.18 regression so ideally should be fixed before 4.18 is released.

Ben.

 arch/arm/mm/flush.c | 1 +
 1 file changed, 1 insertion(+)

index 58469623b015..5345f86c56d2 100644
@@ -295,6 +295,7 @@ void __sync_icache_dcache(pte_t pteval)
 	if (pte_exec(pteval))
 		__flush_icache_all();
 }
+EXPORT_SYMBOL_GPL(__sync_icache_dcache);
 #endif
 
 /*

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