From: Ben Hutchings Date: Wed, 11 Jul 2018 23:40:55 +0100 Subject: ARM: mm: Export __sync_icache_dcache() for xen-privcmd Forwarded: https://marc.info/?l=linux-arm-kernel&m=153134944429241 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. Fixes: 3ad0876554ca ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE") Signed-off-by: Ben Hutchings --- arch/arm/mm/flush.c | 1 + 1 file changed, 1 insertion(+) Index: debian-kernel/arch/arm/mm/flush.c =================================================================== --- debian-kernel.orig/arch/arm/mm/flush.c +++ debian-kernel/arch/arm/mm/flush.c @@ -292,6 +292,7 @@ void __sync_icache_dcache(pte_t pteval) if (pte_exec(pteval)) __flush_icache_all(); } +EXPORT_SYMBOL_GPL(__sync_icache_dcache); #endif /*