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From: Ben Hutchings <ben@decadent.org.uk>
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 <ben@decadent.org.uk>
---
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
/*
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