NAME<\/a> MAP_NR \u2212 get memory map index for page in kernel memory<\/p>\n #include #define MAP_NR(<\/b>page<\/i>)<\/b><\/p>\n This macro maps the page of kernel memory to an index into the mem_map<\/b> array. The input page is kernel-space page addresses such as those that come from the get_free_page<\/b>(9) function. The expression mem_map[MAP_NR(page)]<\/i> returns a pointer to a mem_map_t<\/i> for the page in question.<\/p>\n 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.<\/p>\n Returns an index into the mem_map<\/b> array.<\/p>\n Linux 2.0+<\/p>\n get_free_pages<\/b>(9)<\/p>\n \/usr\/include\/asm\/page.h<\/i><\/p>\n
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