Bug#773309: CONFIG_PSTORE not enabled for arm64

[Ian Campbell <ijc@debian.org>]

On Tue, 2014-12-16 at 17:52 +0000, Leif Lindholm wrote:
> Package: src:linux
> Severity: normal
> X-Debbugs-CC: ijc@debian.org
> 
> I noticed efivars was being automatically loaded on boot on my
> installed amd64 Jessie, but not on my arm64 Jessie. The
> installer/rescue image automatically loads it for both.
> Turns out on amd64, efivars is being pulled in as a dependency for
> efi_pstore, which is not built for arm64 since CONFIG_PSTORE is not
> enabled.
> 
> Upstream, CONFIG_PSTORE is not enabled since CONFIG_MISC_FS is not
> enabled in the upstream defconfig. In debian, however, CONFIG_MISC_FS
> is enabled for all architectures, but CONFIG_PSTORE only for
> ia64/kernelarch-x86.
> 
> Could we enable CONFIG_PSTORE for arm64 as well, please?

Is PSTORE (going to be) a thing on arm64? (I'm not entirely sure what
pstore is, so sorry if this is a silly question).

Any idea what causes efi_pstore to be loaded automatically?

Is efivars needed only for efibootmgr or are there other reasons to want
it?

(I don't have an x86 EFI system available to poke around and answer
these for myself).

I'm wondering if we ought to figure out how to load it automatically
independent of the pstore stuff, for all arches.

Ian.