On Thu, Dec 20, 2012 at 08:15:30PM +0000, Stephen Warren wrote: > On 12/20/2012 10:59 AM, Stephen Warren wrote: > > On 12/20/2012 10:36 AM, Will Deacon wrote: > >> I think you're better off using what we currently have and hanging your code > >> off platform_cpu_kill. > > > > OK, I'll look into that. Joseph Lo just posted patches to implement > > cpu_kill() on Tegra, which was needed to fix some issues in our hotplug > > code anyway. Perhaps that will remove the need for any other changes... > > Will, Hi Stephen, > I just remembered one other advantage of disable_nonboot_cpus(); it > always makes the kexec happen on the boot CPU. Without this, I believe > it's random whether CPU0 or CPU1 performs the kexec. I suspect it's most > likely to work if we can always kexec on the boot CPU rather than a > random CPU? It will be the same CPU as the one which made the kexec system call. If you need to invoke this from a specific CPU, you currently have to do this in userspace using something like the `taskset' utility. Linux can actually boot on any physical CPU for ARM now (thanks to the logical map) but most platforms have restrictions related to secure firmware. Will
