On Mon, 14 May 2012, Pravin B Shelar wrote: > On arches that do not support this_cpu_cmpxchg_double slab_lock is used > to do atomic cmpxchg() on double word which contains page->_count. > page count can be changed from get_page() or put_page() without taking > slab_lock. That corrupts page counter. > > Following patch fixes it by moving page->_count out of cmpxchg_double > data. So that slub does no change it while updating slub meta-data in > struct page. Ugly. Maybe its best to not touch the count in the page lock case in slub? You could accomplish that by changing the definition of counters in mm_types.h. Make it unsigned instead of unsigned long so that it only covers the first part of the struct (which excludes the refcounter) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>