[Crash-utility] arm64: Get CPU registers without crash_notes symbol

[lijiang]

> On Fri, 2021-08-20 at 01:26 +0000, HAGIO KAZUHITO(萩尾 一仁) wrote:
> > -----Original Message-----
> > > Dear Kazu,
> > >
> > > Sorry for late reply
> > > Thanks for your suggestion and I have prepared a V2 patch, please
> > > help
> > > to review.
> >
> > ok, I've modified your v2 patch to fix the following compilation
> > warning
> > and rewrite the commit log, and attached it.
> >
> > arm64.c: In function ‘arm64_init’:
> > arm64.c:3728:35: warning: ‘note’ may be used uninitialized in this
> > function [-Wmaybe-uninitialized]
>

This warning can be eliminated as follows:
--- a/arm64.c
+++ b/arm64.c
@@ -3698,14 +3698,48 @@ arm64_get_crash_notes(void)
 {
        struct machine_specific *ms = machdep->machspec;
        ulong crash_notes;
-       Elf64_Nhdr *note;
+       Elf64_Nhdr *note = NULL;
        ulong offset;

But I didn't see this correction in V2. Can you help to add the
initialization of the note variable Kazu. Otherwise:
Acked-by:  Lianbo Jiang <lijiang at redhat.com>

BTW: the patch format is still unfriendly to me.

Thanks
Lianbo

>      offset = roundup(offset + note->n_namesz, 4);
> >                                    ^~
> > Kazu, thanks for your kind help.
>
> > Lianbo, could you review the attached patch?
> >
> > Thanks,
> > Kazu
>
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