Reviewed-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
On Tue, Jun 26, 2018 at 9:31 PM Baoquan He <bhe@xxxxxxxxxx> wrote:
>
> It's used to record how many memory sections are marked as present
> during system boot up, and will be used in the later patch.
>
> Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
> ---
> mm/sparse.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index f13f2723950a..6314303130b0 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -200,6 +200,12 @@ static inline int next_present_section_nr(int section_nr)
> (section_nr <= __highest_present_section_nr)); \
> section_nr = next_present_section_nr(section_nr))
>
> +/*
> + * Record how many memory sections are marked as present
> + * during system bootup.
> + */
> +static int __initdata nr_present_sections;
> +
> /* Record a memory area against a node. */
> void __init memory_present(int nid, unsigned long start, unsigned long end)
> {
> @@ -229,6 +235,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
> ms->section_mem_map = sparse_encode_early_nid(nid) |
> SECTION_IS_ONLINE;
> section_mark_present(ms);
> + nr_present_sections++;
> }
> }
> }
> --
> 2.13.6
>
