Re: [PATCH v1 2/4] memblock: update initialization of reserved pages

Mike Rapoport
2021-04-20T15:03:22Z

On Tue, Apr 20, 2021 at 03:56:28PM +0200, David Hildenbrand wrote:
> On 20.04.21 11:09, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > The struct pages representing a reserved memory region are initialized
> > using reserve_bootmem_range() function. This function is called for each
> > reserved region just before the memory is freed from memblock to the buddy
> > page allocator.
> >
> > The struct pages for MEMBLOCK_NOMAP regions are kept with the default
> > values set by the memory map initialization which makes it necessary to
> > have a special treatment for such pages in pfn_valid() and
> > pfn_valid_within().
>
> Just a general question while thinking about it:
>
> Would we right now initialize the memmap of these pages already via
> memmap_init_zone()->memmap_init_range()? (IOW, not marking the
> PageReserved?)

Yep. These pages are part of memblock.memory so they are initialized in
memmap_init_zone()->memmap_init_range() to the default values.

--
Sincerely yours,
Mike.