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[MIPS] Hook for platforms to define cachability of /dev/mem regions
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -6,6 +6,8 @@
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* Copyright (C) 1994 - 2003, 07 by Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2007 MIPS Technologies, Inc.
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*/
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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@ -164,3 +166,11 @@ void __init cpu_cache_init(void)
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panic(cache_panic);
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}
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int __weak __uncached_access(struct file *file, unsigned long addr)
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{
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if (file->f_flags & O_SYNC)
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return 1;
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return addr >= __pa(high_memory);
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}
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@ -75,6 +75,13 @@ static inline int uncached_access(struct file *file, unsigned long addr)
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* On ia64, we ignore O_SYNC because we cannot tolerate memory attribute aliases.
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*/
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return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
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#elif defined(CONFIG_MIPS)
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{
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extern int __uncached_access(struct file *file,
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unsigned long addr);
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return __uncached_access(file, addr);
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}
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#else
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/*
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* Accessing memory above the top the kernel knows about or through a file pointer
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