Hi Simon, On Wed, Dec 19, 2012 at 5:56 PM, Simon Jeons <[email protected]> wrote: > One question. > > I found that mainly callsite of expand_stack() is #PF, but it holds > mmap_sem each time before call expand_stack(), how can hold a *shared* > mmap_sem happen?
the #PF handler calls down_read(&mm->mmap_sem) before calling expand_stack. I think I'm just confusing you with my terminology; shared lock == read lock == several readers might hold it at once (I'd say they share it) -- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
