On Thu, Mar 12, 2015 at 03:51:11PM -0400, John David Anglin wrote: > On 2015-03-12 3:35 PM, Aaro Koskinen wrote: > >Hi, > > > >On Wed, Mar 11, 2015 at 08:21:35PM -0400, John David Anglin wrote: > >>On 2015-03-11, at 7:31 PM, Graham Gower wrote: > >>>I thought this patch was supposed to address the problem? > >>>https://lkml.org/lkml/2015/2/26/230 > >>> > >>>However, its not fixed it for me either in 4.0.0-rc3. > >>I doubt the patch is correct for parisc. I believe the system where > >>I saw the BUG messages has PT_NLEVELS == 3. > >For 32-bit kernels, the fix helped. > 32-bit kernels have PT_NLEVELS == 2. I think the define needs to be moved > outside #if/#endif > but didn't get a chance to test last night. There's hack in pgd_alloc() on parisc to initialize one pmd, which is not accounted and we get underflow on exit. We need to adjust accounting for that pmd. Could you try the patch below? diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h index f213f5b4c423..8ee9a0bdc468 100644 --- a/arch/parisc/include/asm/pgalloc.h +++ b/arch/parisc/include/asm/pgalloc.h @@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm) /* The first pmd entry also is marked with _PAGE_GATEWAY as * a signal that this pmd may not be freed */ __pgd_val_set(*pgd, PxD_FLAG_ATTACHED); + mm_inc_nr_pmds(mm); #endif } return actual_pgd; -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
