It was a while ago that I debugged this. I already reported this bug to Benjamin Herrenschmidt (now in CC), and I believe he has a patch of his own to fix the same issue.
As I understand it, of_core_init sets up the OF entries in /sys/firmware/devicetree. During platform bringup, when the system describes the cpu + cache hierarchy, it also makes an of_node symlink into that directory. However, if it doesn't exist yet, you get the warning. # ls -l /sys/devices/system/cpu/cpu3/of_node lrwxrwxrwx 1 root root 0 Jan 1 00:00 /sys/devices/system/cpu/cpu3/of_node -> ../../../../firmware/devicetree/base/cpus/cpu@3 On Wed, Jun 7, 2017 at 2:35 AM, Mark Rutland <mark.rutl...@arm.com> wrote: > On Wed, Jun 07, 2017 at 09:07:20AM +0200, Geert Uytterhoeven wrote: >> CC devicetree folks >> >> On Wed, Jun 7, 2017 at 12:59 AM, Palmer Dabbelt <pal...@dabbelt.com> wrote: >> > From: "Wesley W. Terpstra" <wes...@sifive.com> >> > >> > This fixes: [ 0.010000] cpu cpu0: Error -2 creating of_node link >> > ... which you get for every CPU on all architectures with a OF cpu/ node. > > I take it this means a /cpus node? Or the /cpus/cpu@* nodes? > > I'm not seeing this on arm64 when booting v4.12-rc4 with DT, so clearly > this doesn't affect all such architectures. > > What path are these errors happening in? > > Thanks, > Mark. > >> > >> > This affects riscv, nios, etc. >> > >> > Signed-off-by: Palmer Dabbelt <pal...@dabbelt.com> >> > --- >> > drivers/base/init.c | 2 +- >> > 1 file changed, 1 insertion(+), 1 deletion(-) >> > >> > diff --git a/drivers/base/init.c b/drivers/base/init.c >> > index 48c0e220acc0..0dcd17e561d0 100644 >> > --- a/drivers/base/init.c >> > +++ b/drivers/base/init.c >> > @@ -31,9 +31,9 @@ void __init driver_init(void) >> > /* These are also core pieces, but must come after the >> > * core core pieces. >> > */ >> > + of_core_init(); >> > platform_bus_init(); >> > cpu_dev_init(); >> > memory_dev_init(); >> > container_dev_init(); >> > - of_core_init(); >> > } >> > -- >> > 2.13.0 >> -- >> To unsubscribe from this list: send the line "unsubscribe devicetree" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html
