On Tue, Apr 25, 2017 at 08:38:42AM +0200, Ingo Molnar wrote: > > * Kirill A. Shutemov <kirill.shute...@linux.intel.com> wrote: > > > On Mon, Apr 24, 2017 at 11:42:34AM -0700, Dan Williams wrote: > > > > > > > > I cannot reproduce the issue. > > > > > > > > Could you share your kernel kernel config? > > > > > > Kernel config available here: > > > https://gist.github.com/djbw/2b99a014396cca9f4406586573be98c0 > > > > Patch below should help. Please check. > > > > diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c > > index a242139df8fe..745e5e183169 100644 > > --- a/arch/x86/mm/init_64.c > > +++ b/arch/x86/mm/init_64.c > > @@ -962,7 +962,7 @@ remove_pud_table(pud_t *pud_start, unsigned long addr, > > unsigned long end, > > continue; > > } > > > > - pmd_base = (pmd_t *)pud_page_vaddr(*pud); > > + pmd_base = pmd_offset(pud, 0); > > remove_pmd_table(pmd_base, addr, next, direct); > > free_pmd_table(pmd_base, pud); > > } > > @@ -988,7 +988,7 @@ remove_p4d_table(p4d_t *p4d_start, unsigned long addr, > > unsigned long end, > > > > BUILD_BUG_ON(p4d_large(*p4d)); > > > > - pud_base = (pud_t *)p4d_page_vaddr(*p4d); > > + pud_base = pud_offset(p4d, 0); > > remove_pud_table(pud_base, addr, next, direct); > > free_pud_table(pud_base, p4d); > > } > > @@ -1013,7 +1013,7 @@ remove_pagetable(unsigned long start, unsigned long > > end, bool direct) > > if (!pgd_present(*pgd)) > > continue; > > > > - p4d = (p4d_t *)pgd_page_vaddr(*pgd); > > + p4d = p4d_offset(pgd, 0); > > remove_p4d_table(p4d, addr, next, direct); > > } > > Type casts are dangerous, chapter 378. I missed them when applying the > patches. > > Could you please double-check all other type casts introduced by the 5-level > paging patches, to make sure it's all using natural type conversions?
I looked though at the rest of (p4d_t) and (p4d_t *) casts and they look okay: under pgd_none()/!pgd_preset() or within #if PTRS_PER_P4d > 1. I'll prepare proper patch. -- Kirill A. Shutemov
