On 07/16/2015 07:03 PM, Catalin Marinas wrote: > On Thu, Jul 16, 2015 at 06:30:11PM +0300, Andrey Ryabinin wrote: >> >> I think this may work, if pud_none(*pud) will be replaced with >> !pud_val(*pud). >> We can't use pud_none() because with 2-level page tables it's always false, >> so >> we will never go down to pmd level where swapper_pg_dir populated. > > The reason I used "do ... while" vs "while" or "for" is so that it gets > down to the pmd level. The iteration over pgd is always done in the top > loop via pgd_addr_end while the loops for missing levels (nopud, nopmd) > are always a single iteration whether we check for pud_none or not. But > when the level is present, we avoid looping when !pud_none(). >
Right, dunno what I was thinking. It seems to work. Lightly tested with every possible CONFIG_PGTABLE_LEVELS. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
