On Tue, 24 Nov 2015 21:27:13 +0100 Michal Hocko <mhocko at kernel.org> wrote: > > What happens if: > > > > CPU 0: CPU 1: > > ------ ------ > > nmi_panic(); > > > > nmi_panic(); > > <external nmi> > > nmi_panic(); > > I thought that nmi_panic is called only from the nmi context. If so how > can we get a nested NMI like that? Nevermind. I was thinking the external NMI could nest, but I'm guessing it cant. Anyway, the patches later on modify this code which checks for something other than != this_cpu, which makes this issue mute even if it could nest. -- Steve
