Re: [PATCH] LoongArch: add p?d_leaf() definitions

[Hongchen Zhang]

On 2023/9/6 下午4:08, David Hildenbrand wrote:
> On 06.09.23 10:06, Hongchen Zhang wrote:
> > Hi David,
> >
> > On 2023/9/6 pm 3:42, David Hildenbrand wrote:
> > > On 05.09.23 08:49, Hongchen Zhang wrote:
> > > > When I do LTP test, LTP test case ksm06 caused panic at
> > > >      break_ksm_pmd_entry
> > > >        -> pmd_leaf (Huge page table but False)
> > > >        -> pte_present (panic)
> > >
> > > Probably there are other problematic bits without that can trigger that?
> > > I suspect walk_page_range*() callers might be affected,
> > I rechecked the code and found that other architectures that support
> > THP have defined pmd_leaf.
> > So there is not problem on other architectures.
>
> I meant other walk_page_range*() callers on loongarch might similarly be 
> affected. IOW, KSM might not be the only bit being able to trigger such 
> panics on loongarch.
Yes, perf_get_pgtable_size and vmalloc_to_page also call pmd_leaf.
So they may also trigger this issue on LoongArch.
>


--
Best Regards
Hongchen Zhang