Re: [PATCH 04/31] kasan, page_alloc: simplify kasan_poison_pages call site

[Andrey Konovalov]

On Wed, Dec 1, 2021 at 3:10 PM Marco Elver <elver@xxxxxxxxxx> wrote:
>
> On Tue, Nov 30, 2021 at 10:39PM +0100, andrey.konovalov@xxxxxxxxx wrote:
> > From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> >
> > Simplify the code around calling kasan_poison_pages() in
> > free_pages_prepare().
> >
> > Reording kasan_poison_pages() and kernel_init_free_pages() is OK,
> > since kernel_init_free_pages() can handle poisoned memory.
>
> Why did they have to be reordered?

It's for the next patch, I'll move the reordering there in v2.

> > This patch does no functional changes besides reordering the calls.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> > ---
> >  mm/page_alloc.c | 18 +++++-------------
> >  1 file changed, 5 insertions(+), 13 deletions(-)
> >
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 3f3ea41f8c64..0673db27dd12 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -1289,6 +1289,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
> >  {
> >       int bad = 0;
> >       bool skip_kasan_poison = should_skip_kasan_poison(page, fpi_flags);
>
> skip_kasan_poison is only used once now, so you could remove the
> variable -- unless later code will use it in more than once place again.

Will do in v2.

Thanks!