On Tue, Nov 14, 2017 at 04:37:34PM -0800, Dave Hansen wrote: > On 11/14/2017 04:33 PM, Tycho Andersen wrote: > >> > >> void set_bh_page(struct buffer_head *bh, > >> ... > >> bh->b_data = page_address(page) + offset; > > Ah, yes. I guess there will be many bugs like this :). Anyway, I'll > > try to cook up a patch. > > It won't catch all the bugs, but it might be handy to have a debugging > mode that records the location of the last user of page_address() and > friends. That way, when we trip over an unmapped page, we have an > easier time finding the offender. Ok, what I've been doing now is saving the stack frame of the code that allocated the page, which also seems useful. I'll see about adding a DEBUG_XPFO config option for the next series with both of these things, though. Cheers, Tycho -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
