Re: [PATCH v2] ARM: initialize jump labels before setup_machine_fdt()

[Phil Elwell]

Hi Greg,

On 07/06/2022 10:10, Greg KH wrote:
> On Tue, Jun 07, 2022 at 09:47:30AM +0100, Phil Elwell wrote:
> > Hi Jason,
> >
> > On 07/06/2022 09:30, Jason A. Donenfeld wrote:
> > > Hi Phil,
> > >
> > > Thanks for testing this. Can you let me know if v1 of this works?
> > >
> > > https://lore.kernel.org/lkml/20220602212234.344394-1-Jason@xxxxxxxxx/
> > >
> > > (I'll also fashion a revert for this part of stable.)
> > >
> > > Jason
> >
> > Thanks for the quick response, but that doesn't work for me either. Let me
> > say again that I'm on a downstream kernel (rpi-5.15.y) so this may not be a
> > universal problem, but merging either of these fixing patches would be fatal
> > for us.
>
> I have reports of a "clean" 5.15.45 working just fine on a rpi.
> Anything special in your tree that isn't upstream yet that might be
> conflicting with this?  Any chance you can try a kernel.org release
> instead?

A clean 5.15.45 boots cleanly, whereas a downstream kernel shows the static key 
warning (but it does go on to boot). The significant difference is that our 
defconfigs set CONFIG_RANDOM_TRUST_BOOTLOADER=y - defining that on top of 
multi_v7_defconfig demonstrates the issue on a clean 5.15.45. Conversely, not 
setting that option in a downstream kernel build avoids the warning, presumably 
because it takes much longer to accumulate the required entropy.

Phil