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    Subject[RFC PATCH 01/12] x86: export set_memory_ro and set_memory_rw
    Date
    From: Bruce Allan <bruce.w.allan@intel.com>

    Export set_memory_ro() and set_memory_rw() calls for use by drivers that need
    to have more debug information about who might be writing to memory space.
    this was initially developed for use while debugging a memory corruption
    problem with e1000e.

    Ingo Molnar <mingo@elte.hu> said:
    >> +EXPORT_SYMBOL(set_memory_rw);
    > that's fine, as long as you make it kernel-internal EXPORT_SYMBOL_GPL()

    patch was modified with this suggestion.

    Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
    Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
    Acked-by: Ingo Molnar <mingo@elte.hu>
    ---

    arch/x86/mm/pageattr.c | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
    index 43e2f84..62c1eef 100644
    --- a/arch/x86/mm/pageattr.c
    +++ b/arch/x86/mm/pageattr.c
    @@ -906,11 +906,13 @@ int set_memory_ro(unsigned long addr, int numpages)
    {
    return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_RW));
    }
    +EXPORT_SYMBOL_GPL(set_memory_ro);

    int set_memory_rw(unsigned long addr, int numpages)
    {
    return change_page_attr_set(addr, numpages, __pgprot(_PAGE_RW));
    }
    +EXPORT_SYMBOL_GPL(set_memory_rw);

    int set_memory_np(unsigned long addr, int numpages)
    {


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