Re: [PATCH -next v4 1/4] mm: page_table_check: move pxx_user_accessible_page into x86

[Pasha Tatashin <pasha.tatashin@soleen.com>]

On Wed, Apr 20, 2022 at 2:45 AM Tong Tiangen <tongtiangen@huawei.com> wrote:
>
>
>
> 在 2022/4/19 17:29, Anshuman Khandual 写道:
> >
> >
> > On 4/18/22 09:14, Tong Tiangen wrote:
> >> --- a/mm/page_table_check.c
> >> +++ b/mm/page_table_check.c
> >> @@ -10,6 +10,14 @@
> >>   #undef pr_fmt
> >>   #define pr_fmt(fmt)        "page_table_check: " fmt
> >>
> >> +#ifndef PMD_PAGE_SIZE
> >> +#define PMD_PAGE_SIZE       PMD_SIZE
> >> +#endif
> >> +
> >> +#ifndef PUD_PAGE_SIZE
> >> +#define PUD_PAGE_SIZE       PUD_SIZE
> >> +#endif
> >
> > Why cannot PMD_SIZE/PUD_SIZE be used on every platform instead ? What is the
> > need for using PUD_PAGE_SIZE/PMD_PAGE_SIZE ? Are they different on x86 ?
> > .
>
> Hi, Pasha：
> I checked the definitions of PMD_SIZE/PUD_SIZE and
> PUD_PAGE_SIZE/PMD_PAGE_SIZE in x86 architecture and their use outside
> the architecture(eg: in mm/, all used PMD_SIZE/PUD_SIZE), Would it be
> better to use a unified PMD_SIZE/PUD_SIZE here?

Hi Tong,

Yes, it makes sense to use PMD_SIZE/PUD_SIZE instead of
PUD_PAGE_SIZE/PMD_PAGE_SIZE in page_table_check to be inline with the
rest of the mm/

Pasha

>
> Thanks,
> Tong.