32 lines
1.0 KiB
Diff
32 lines
1.0 KiB
Diff
From: Ben Hutchings <ben@decadent.org.uk>
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Date: Wed, 11 Jul 2018 23:40:55 +0100
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Subject: ARM: mm: Export __sync_icache_dcache() for xen-privcmd
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Forwarded: https://marc.info/?l=linux-arm-kernel&m=153134944429241
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The xen-privcmd driver, which can be modular, calls set_pte_at()
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which in turn may call __sync_icache_dcache().
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The call to __sync_icache_dcache() may be optimised out because it is
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conditional on !pte_special(), and xen-privcmd calls pte_mkspecial().
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However, in a non-LPAE configuration there is no "special" bit and the
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call is really unconditional.
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Fixes: 3ad0876554ca ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE")
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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arch/arm/mm/flush.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
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index 58469623b015..5345f86c56d2 100644
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--- a/arch/arm/mm/flush.c
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+++ b/arch/arm/mm/flush.c
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@@ -295,6 +295,7 @@ void __sync_icache_dcache(pte_t pteval)
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if (pte_exec(pteval))
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__flush_icache_all();
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}
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+EXPORT_SYMBOL_GPL(__sync_icache_dcache);
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#endif
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/*
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