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    Subject[patch 11/13] x86: PAT Add set_memory_wc() interface
    Add a set_memory_wc interface(), similar to set_memory_uc interface.
    Callers has to call set_memory_uc, set_memory_wb and
    set_memory_wc, set_memory_wb as pairs.

    Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
    Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>

    Index: linux-2.6-x86.git/arch/x86/mm/pageattr.c
    ===================================================================
    --- linux-2.6-x86.git.orig/arch/x86/mm/pageattr.c 2008-03-18 03:23:49.000000000 -0700
    +++ linux-2.6-x86.git/arch/x86/mm/pageattr.c 2008-03-18 03:53:45.000000000 -0700
    @@ -788,6 +788,25 @@
    }
    EXPORT_SYMBOL(set_memory_uc);

    +int _set_memory_wc(unsigned long addr, int numpages)
    +{
    + return change_page_attr_set(addr, numpages,
    + __pgprot(_PAGE_CACHE_WC));
    +}
    +
    +int set_memory_wc(unsigned long addr, int numpages)
    +{
    + if (!pat_wc_enabled)
    + return set_memory_uc(addr, numpages);
    +
    + if (reserve_memtype(addr, addr + numpages * PAGE_SIZE,
    + _PAGE_CACHE_WC, NULL))
    + return -EINVAL;
    +
    + return _set_memory_wc(addr, numpages);
    +}
    +EXPORT_SYMBOL(set_memory_wc);
    +
    int _set_memory_wb(unsigned long addr, int numpages)
    {
    return change_page_attr_clear(addr, numpages,
    Index: linux-2.6-x86.git/include/asm-x86/cacheflush.h
    ===================================================================
    --- linux-2.6-x86.git.orig/include/asm-x86/cacheflush.h 2008-03-18 03:21:25.000000000 -0700
    +++ linux-2.6-x86.git/include/asm-x86/cacheflush.h 2008-03-18 03:53:45.000000000 -0700
    @@ -35,8 +35,10 @@
    int set_pages_rw(struct page *page, int numpages);

    int _set_memory_uc(unsigned long addr, int numpages);
    +int _set_memory_wc(unsigned long addr, int numpages);
    int _set_memory_wb(unsigned long addr, int numpages);
    int set_memory_uc(unsigned long addr, int numpages);
    +int set_memory_wc(unsigned long addr, int numpages);
    int set_memory_wb(unsigned long addr, int numpages);
    int set_memory_x(unsigned long addr, int numpages);
    int set_memory_nx(unsigned long addr, int numpages);
    --


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