On Tue, Feb 27, 2018 at 02:18:36PM -0500, Waiman Long wrote: > On 02/09/2018 04:25 AM, Joerg Roedel wrote: > > SAVE_ALL > > ENCODE_FRAME_POINTER > > + > > + /* Make sure we are running on kernel cr3 */ > > + SWITCH_TO_KERNEL_CR3 scratch_reg=%eax > > + > > xorl %edx, %edx # error code 0 > > movl %esp, %eax # pt_regs pointer > > > > The debug exception calls ret_from_exception on exit. If coming from > userspace, the C function prepare_exit_to_usermode() will be called. > With the PTI-32 code, it means that function will be called with the > entry stack instead of the task stack. This can be problematic as macro > like current won't work anymore. This is not different from before, no? The debug handler already can be entered on entry stack before this patch-set. Joerg -- 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>
