On Wed, Apr 12, 2023 at 5:46 PM Lucas Tanure <tanure@xxxxxxxxx> wrote:
>
> Change the order of scanning /memreserve/ and /reserved-memory node.
> /reserved-memory node should go first, as it has a more updated
> description of the memory regions and it can apply flags, like nomap.
> Also, /memreserve/ should avoid reserving regions described in
> /reserved-memory node.
Please give some background details why we need to make this change.
As-is, sounds like some theoretical issue. IOW, incorporate some of
the details in the cover letter here. For single patches, you don't
need a cover letter anyways.
Powerpc folks, please comment and/or test. I worry there could be some
subtle differences with this change.
>
> Signed-off-by: Lucas Tanure <tanure@xxxxxxxxx>
> ---
> drivers/of/fdt.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index d1a68b6d03b3..c28aedd7ae1f 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -635,6 +635,9 @@ void __init early_init_fdt_scan_reserved_mem(void)
> if (!initial_boot_params)
> return;
>
> + fdt_scan_reserved_mem();
> + fdt_reserve_elfcorehdr();
> +
> /* Process header /memreserve/ fields */
> for (n = 0; ; n++) {
> fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
> @@ -643,8 +646,6 @@ void __init early_init_fdt_scan_reserved_mem(void)
> memblock_reserve(base, size);
> }
>
> - fdt_scan_reserved_mem();
> - fdt_reserve_elfcorehdr();
> fdt_init_reserved_mem();
> }
>
> --
> 2.40.0
>
