How to get linux kernel page size programmatically

Question

I am working on a Linux module for IA64. My current problem is that the driver uses the PAGE_SIZE and PAGE_SHIFT macros for dma page allocation. The problem I am having is tha

Answer 1

One approximate method is to read /proc/meminfo and check Mapped size ( on mine its 52544 kB as of now ) and then check nr_mapped in /proc/vmstat ( on mine its 131136 as of now ). Finally PAGE_SIZE = Mapped/nr_mapped. Sometimes this gives you an accurate value ( as in the current example I've quoted ) and sometimes its approximate but very close. Hope this helps!