diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2007-07-10 17:32:56 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-07-10 17:32:56 +0100 |
| commit | 24e9d0b96dac5503c0b6f034d553030c604228a7 (patch) | |
| tree | 19924ab3906f524f8b50983612c8cf056dfdaa72 | |
| parent | 8bb809df6919f927bcb910bbc852d5724eaa1eb9 (diff) | |
[MIPS] Hook for platforms to define cachability of /dev/mem regions
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/mm/cache.c | 10 | ||||
| -rw-r--r-- | drivers/char/mem.c | 7 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c index abf99b1eba1..81f925a9a73 100644 --- a/arch/mips/mm/cache.c +++ b/arch/mips/mm/cache.c @@ -6,6 +6,8 @@ * Copyright (C) 1994 - 2003, 07 by Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 2007 MIPS Technologies, Inc. */ +#include <linux/fs.h> +#include <linux/fcntl.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> @@ -164,3 +166,11 @@ void __init cpu_cache_init(void) panic(cache_panic); } + +int __weak __uncached_access(struct file *file, unsigned long addr) +{ + if (file->f_flags & O_SYNC) + return 1; + + return addr >= __pa(high_memory); +} diff --git a/drivers/char/mem.c b/drivers/char/mem.c index cc9a9d0df97..7e082bceed5 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -75,6 +75,13 @@ static inline int uncached_access(struct file *file, unsigned long addr) * On ia64, we ignore O_SYNC because we cannot tolerate memory attribute aliases. */ return !(efi_mem_attributes(addr) & EFI_MEMORY_WB); +#elif defined(CONFIG_MIPS) + { + extern int __uncached_access(struct file *file, + unsigned long addr); + + return __uncached_access(file, addr); + } #else /* * Accessing memory above the top the kernel knows about or through a file pointer |