Re: [PATCH -v2 09/10] m68k,mm: Fully initialize the page-table allocator

Geert Uytterhoeven
2020-02-07T10:58:58Z

Hoi Peter,

Thanks for your patch!

On Fri, Jan 31, 2020 at 1:56 PM Peter Zijlstra <peterz@infradead.org> wrote:
> Also iterate the PMD tables to populate the PTE table allocator. This
> also fully replaces the previous zero_pgtable hack.

As no code is being removed in this patch, does this mean this case was
broken since "[PATCH 06/10] m68k,mm: Improve kernel_page_table()"?

> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> arch/m68k/mm/init.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> --- a/arch/m68k/mm/init.c
> +++ b/arch/m68k/mm/init.c
> @@ -120,7 +120,7 @@ void free_initmem(void)
> static inline void init_pointer_tables(void)
> {
> #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
> - int i;
> + int i, j;
>
> /* insert pointer tables allocated so far into the tablelist */
> init_pointer_table(kernel_pg_dir, TABLE_PGD);
> @@ -133,6 +133,17 @@ static inline void init_pointer_tables(v
>
> pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
> init_pointer_table(pmd_dir, TABLE_PMD);
> +
> + for (j = 0; j < PTRS_PER_PMD; j++) {
> + pmd_t *pmd = &pmd_dir[j];
> + pte_t *pte_dir;
> +
> + if (!pmd_present(*pmd))
> + continue;
> +
> + pte_dir = (pte_t *)__pmd_page(*pmd);
> + init_pointer_table(pte_dir, TABLE_PTE);
> + }
> }
> #endif
> }

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds