[Skiboot] [PATCH 2/2] Remove skiboot 'trace' infrastructure

[Oliver]

On Wed, Dec 12, 2018 at 3:07 PM Joel Stanley <joel at jms.id.au> wrote:
>
> On Wed, 12 Dec 2018 at 14:28, Stewart Smith <stewart at linux.ibm.com> wrote:
> >
> > Joel Stanley <joel at jms.id.au> writes:
> > > This feature has bit rotted. For instance, the FSP TCE mapping was
> > > broken in 2015 by commit f2a7a5c23d81 ("Move boot_tracebuf to BSS"),
> > > and no one seems to have noticed.
> >
> > Oliver, you were showing signs in Slack of "volunteering" of becoming
> > the maintainer of this stuff and cleaning up.
> >
> > Your thoughts on ripping it out for the moment versus just ripping out
> > the FSP bit in patch 1?
>
> The linker script bit is a noop, as f2a7a5c23d81 stopped using the
> section defined in the linker script.
>
> The comment about FSP was from map_debug_areas in
> platforms/ibm-fsp/common.c. I assumed that Ben had the traces in a
> defined area for it to be mapped properly. But I could be interpreting
> the intent of that wrong.

Yes, it was placed in it's own section so that the linker script could
force it to a 4K alignment. Moving it to .bss would be fine if we
fixed the linker script rather than removing the section annotation.

Anyway, I have plans to use this stuff and as soon as I do it's going
to require either:
a) Reverting this patch to remove it, or
b) Rewriting it entirely

There's not much point in either, so leave this alone.


> > Stewart Smith
> > OPAL Architect, IBM.
> >