* H. Peter Anvin <h...@linux.intel.com> wrote:
> On 11/07/2013 11:02 AM, Olof Johansson wrote:
> >> [ 0.000000] reserving inaccessible SNB gfx pages
> >> [ 0.000000] memblock_reserve: [0x00000000000000-0x00000000100000]
>
> This is on a Sandy Bridge system, which I guess I managed to miss the
> first time. Unfortunately low memory corruption is expected with SNB
> graphics... this is why we unconditionally reserve all low memory on
> SNB.
>
> >> setup_arch+0xa2d/0xa41
> >> [...]
> >>
> >> Unfortunately x86 doesn't keep the memblock structures around, so
> >> there's no way to verify after booting in debugfs, but based on the
> >> above it should have been reserved properly.
> >
> > *prod*
> >
> > So, got a preference on solution for this? The warning seems harmless
> > but still annoying to get used to ignoring false positives, etc.
> >
> > Disable the low memory checker by default? Hide it behind a debug
> > option (runtime or build time)?
>
> I'm inclined to say disable it by default, but I'll let Ingo comment.
> These days we default to reserving all of low memory other than the
> trampoline (which we really can't avoid); leaving it in as a debug
> option seems reasonable, but it is really questionable to me how much it
> is useful to a general user.
If we reserve everything in low memory, all the time (which I very much
argue we should do) then the checker becomes a no-op and can be removed.
Thanks,
Ingo
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