[PATCH] arm64: mm: Fix build error with CONFIG_SPARSEMEM_VMEMMAP disabled

[labbott@redhat.com (Laura Abbott)]

On 05/04/2015 03:33 AM, Jungseung Lee wrote:
> This fix the below build error:
>
> arch/arm64/mm/dump.c: In function ?ptdump_init?:
> arch/arm64/mm/dump.c:331:18: error: ?VMEMMAP_START_NR? undeclared (first use in this function)
>    address_markers[VMEMMAP_START_NR].start_address =
>                    ^
> arch/arm64/mm/dump.c:331:18: note: each undeclared identifier is reported only once for each
> function it appears in
> arch/arm64/mm/dump.c:333:18: error: ?VMEMMAP_END_NR? undeclared (first use in this function)
>    address_markers[VMEMMAP_END_NR].start_address =
>                    ^
>
> Signed-off-by: Jungseung Lee <js07.lee@gmail.com>
> ---
>   arch/arm64/mm/dump.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
> index 74c2567..f3d6221 100644
> --- a/arch/arm64/mm/dump.c
> +++ b/arch/arm64/mm/dump.c
> @@ -328,10 +328,12 @@ static int ptdump_init(void)
>   			for (j = 0; j < pg_level[i].num; j++)
>   				pg_level[i].mask |= pg_level[i].bits[j].mask;
>
> +#ifdef CONFIG_SPARSEMEM_VMEMMAP
>   	address_markers[VMEMMAP_START_NR].start_address =
>   				(unsigned long)virt_to_page(PAGE_OFFSET);
>   	address_markers[VMEMMAP_END_NR].start_address =
>   				(unsigned long)virt_to_page(high_memory);
> +#endif
>
>   	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
>   				 &ptdump_fops);
>

Acked-by: Laura Abbott <labbott@redhat.com>

Did something change recently to make SPARSEMEM_VMEMMAP actually
deselectable? For some reason I thought that couldn't be turned off.