On Sat, 2006-11-04 at 23:09 -0700, arun s wrote: > hi kernel , > is there any problem or difference in checking the _count field in > page and using the page_count() function for checking page status . Here is the code for checking _count: x = page->_count; And here is the code for page_count(): if (PageCompound(page)) page = (struct page *)page_private(page); return atomic_read(&page->_count) + 1; So page_count(): 1. Handles compound pages 2. Reads atomically 3. Adds 1 to get the proper value Avishay Traeger http://www.fsl.cs.sunysb.edu/~avishay/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
