On March 09, 2016 9:56pm, <jbeul...@suse.com> wrote: > >>> On 09.03.16 at 14:46, <quan...@intel.com> wrote: > > Now I am still not clear for this point- "this inconsistency might > > lead to deadlock". > > I think it is similar to 'mixing interrupt disabled and enabled > > spinlocks is something we disallow'. > > I hope you can give me an example about how to lead to deadlock. > > The implication from disabling interrupts while acquiring a lock is that the > lock is > also being acquired by some interrupt handler. If you mix acquire types, the > one > not disabling interrupts is prone to be interrupted, and the interrupt trying > to get > hold of the lock the same CPU already owns. >
Jan, thanks. Now I got it. btw, I also find a good explanation from the comment, inside check_lock(), in xen/common/spinlock.c. Quan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
