Messages in this thread | | | Date | Wed, 4 Oct 2017 13:48:19 +0100 | From | Dave Martin <> | Subject | Re: [PATCH] arm64: Enable MRS emulation early |
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On Wed, Oct 04, 2017 at 12:36:29PM +0100, Catalin Marinas wrote: > On Wed, Oct 04, 2017 at 12:32:07PM +0100, Dave P Martin wrote:
[...]
> > I don't think the hwcaps shouldn't change after entry to userspace, > > so it really doesn't matter whether HWCAP_CPUID is set before or > > after registration: for userspace it should all already have happened. > > Good point, I forgot about this. > > > It looks to me like all initcalls are called in the same kernel thread > > that execs the initramfs init process, before the exec. > > > > So I still don't see how a built-in late initcall can not have been > > called before entry to userspace. > > > > The patch seems to demonstrate that I'm wrong though. > > What am I missing? > > I also wondered about this. I think is the kernel invoking modprobe > before the actual init/linuxrc in an initrd.
Ah, right. Could that be a bug, do you think?
I wonder whether it's even well-defined how early that can happen. i.e., which initcall level is guaranteed early enough to prevent this?
Cheers ---Dave
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