Re: [PATCH 2/2] sh: initialize max_mapnr

[John Paul Adrian Glaubitz]

On Tue, 2023-02-14 at 16:07 +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
> 
> sh never initializes max_mapnr which is used by the generic
> implementation of pfn_valid().
> 
> Initialize max_mapnr with set_max_mapnr() in sh::paging_init().
> 
> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Fixes: e5080a967785 ("mm, arch: add generic implementation of pfn_valid() for FLATMEM")
> Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
> ---
>  arch/sh/mm/init.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
> index 506784702430..bf1b54055316 100644
> --- a/arch/sh/mm/init.c
> +++ b/arch/sh/mm/init.c
> @@ -301,6 +301,7 @@ void __init paging_init(void)
>  	 */
>  	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
>  	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
> +	set_max_mapnr(max_low_pfn - min_low_pfn);
>  
>  	nodes_clear(node_online_map);
>  

Acked-by: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>

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