20 lines
485 B
C
20 lines
485 B
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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if (!pfn_valid(pfn)) {
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return pgprot_noncached(vma_prot);
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} else if (file->f_flags & O_SYNC) {
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return pgprot_writecombine(vma_prot);
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}
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return vma_prot;
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}
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EXPORT_SYMBOL(phys_mem_access_prot);
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