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arm64: 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().
But it seems unwise to rely on this optimisation.

Fixes: 3ad0876554 ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE")
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Ben Hutchings 2018-07-12 00:18:22 +01:00 committed by Will Deacon
parent 0b3e336601
commit c5157101e7
1 changed files with 1 additions and 0 deletions
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arch/arm64/mm/flush.c
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@ -66,6 +66,7 @@ void __sync_icache_dcache(pte_t pte)
sync_icache_aliases(page_address(page),
PAGE_SIZE << compound_order(page));
}
EXPORT_SYMBOL_GPL(__sync_icache_dcache);
/*
* This function is called when a page has been modified by the kernel. Mark