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| author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2008-03-19 01:00:18 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 17:41:19 +0200 |
| commit | 1219333dfdd488e85f08cf07881b8bc63cf92f21 (patch) | |
| tree | 4ada0350f450d84b5ce908fff7d292e4848b5c18 /arch/x86/mm/pageattr.c | |
| parent | x86: PAT use reserve free memtype in ioremap and iounmap (diff) | |
| download | linux-1219333dfdd488e85f08cf07881b8bc63cf92f21.tar.xz linux-1219333dfdd488e85f08cf07881b8bc63cf92f21.zip | |
x86: PAT use reserve free memtype in set_memory_uc
Use reserve_memtype and free_memtype interfaces in set_memory_uc/set_memory_wb
interfaces to avoid aliasing.
Usage model of set_memory_uc and set_memory_wb is for RAM memory and users
will first call set_memory_uc and call set_memory_wb after use to reset the
attribute.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index f7d5ca170c22..938df5e8402b 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -19,6 +19,7 @@ #include <asm/uaccess.h> #include <asm/pgalloc.h> #include <asm/proto.h> +#include <asm/pat.h> /* * The current flushing context - we pass it instead of 5 arguments: @@ -770,18 +771,34 @@ static inline int change_page_attr_clear(unsigned long addr, int numpages, return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask); } -int set_memory_uc(unsigned long addr, int numpages) +int _set_memory_uc(unsigned long addr, int numpages) { return change_page_attr_set(addr, numpages, __pgprot(_PAGE_CACHE_UC)); } + +int set_memory_uc(unsigned long addr, int numpages) +{ + if (reserve_memtype(addr, addr + numpages * PAGE_SIZE, + _PAGE_CACHE_UC, NULL)) + return -EINVAL; + + return _set_memory_uc(addr, numpages); +} EXPORT_SYMBOL(set_memory_uc); -int set_memory_wb(unsigned long addr, int numpages) +int _set_memory_wb(unsigned long addr, int numpages) { return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_CACHE_MASK)); } + +int set_memory_wb(unsigned long addr, int numpages) +{ + free_memtype(addr, addr + numpages * PAGE_SIZE); + + return _set_memory_wb(addr, numpages); +} EXPORT_SYMBOL(set_memory_wb); int set_memory_x(unsigned long addr, int numpages) |