[PATCH 7/7] fs: Fix a confusing error about overlapping regions

[Tom Rini]

On Thu, Aug 31, 2023 at 06:15:19PM -0600, Simon Glass wrote:
> Hi Tom,
> 
> On Wed, 23 Aug 2023 at 09:14, Tom Rini <trini at konsulko.com> wrote:
> >
> > On Wed, Aug 23, 2023 at 07:42:03AM -0600, Simon Glass wrote:
> >
> > > When lmb runs out of space in its internal tables, it gives errors on
> > > every fs load operation. This is horribly confusing, as the poor user
> > > tries different memory regions one at a time.
> > >
> > > Use the updated API to check the error code and print a helpful message.
> > > Also, allow the operation to proceed.
> > >
> > > Update the tests accordingly.
> > >
> > > Signed-off-by: Simon Glass <sjg at chromium.org>
> > [snip]
> > > +     if (ret == -E2BIG) {
> > > +             log_warning("Reservation tables exhausted: see CONFIG_LMB_USE_MAX_REGIONS\n");
> > > +             return 0;
> > > +     }
> >
> > This isn't the right option.  Everyone has CONFIG_LMB_USE_MAX_REGIONS
> > set.  You would want to increase CONFIG_LMB_MAX_REGIONS.
> >
> > But it sounds like what you've found and fixed is an underlying problem
> > as to why 16 regions isn't enough in some common cases now?  So we could
> 
> I don't think I have fixed anything. But I'll send v2 and perhaps it
> will be clearer what is going on here.
> 
> > possibly avoid the string size growth here and have a comment that also
> > matches up with the help under LMB_MAX_REGIONS?
> 
> I don't know, sorry. The size of struct(lmb) on 64-bit sandbox is
> about 400 bytes. There seems to be a lot of code to save not much
> memory.

What do you mean here?  The alternative is not unlimited ranges but
instead to define the limit of memory regions and limit of reserved
ranges.

-- 
Tom
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