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MAP_NR (9)
  • >> MAP_NR (9) ( Разные man: Ядро )
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    NAME

    MAP_NR - get memory map index for page in kernel memory
    
    
     
    

    SYNOPSIS

    #include <linux/mm.h>

    #define MAP_NR(page)

     

    DESCRIPTION

    This macro maps the page of kernel memory to an index into the mem_map array. The input page is kernel-space page addresses such as those that come from the get_free_page(9) function. The expression mem_map[MAP_NR(page)] returns a pointer to a mem_map_t for the page in question.

    Device drivers need access to the page structure if it is implimenting some special kind of memory segment, i.e. cache for a virtual frame buffer.  

    RETURN VALUE

    Returns an index into the mem_map array.  

    AVAILABILITY

    Linux 2.0+  

    SEE ALSO

    get_free_pages(9)

    /usr/include/asm/page.h  

    AUTHOR

    Stephen Williams <steve@icarus.com>  

    BUGS

    There is no check that the page you are passing really is a valid page address.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    AVAILABILITY
    SEE ALSO
    AUTHOR
    BUGS


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