Re: [PATCH] parisc: fix pmd accounting with 3-level page tables

[Graham Gower]

This fixes the problem on my C8000.

Tested-by: graham.gower@xxxxxxxxx

On 13 March 2015 at 21:00, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> There's hack in pgd_alloc() on parisc to initialize one pmd, which is
> not accounted. It leads to underflow on exit.
>
> Let's adjust nr_pmds on pgd_alloc() to get accounting correct.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Cc: John David Anglin <dave.anglin@xxxxxxxx>
> Cc: Aaro Koskinen <aaro.koskinen@xxxxxx>
> Cc: Graham Gower <graham.gower@xxxxxxxxx>
> Cc: Domenico Andreoli <cavokz@xxxxxxxxx>
> ---
>  arch/parisc/include/asm/pgalloc.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
> index 55ad8be9b7f3..068b2fb9a47c 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;
> --
> 2.1.4
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/