Re: [PATCH 1/8] mm: remove a pointless CONFIG_ZONE_DEVICE check in memremap_pages

[Chaitanya Kulkarni]

On 2/6/22 10:32 PM, Christoph Hellwig wrote:
> memremap.c is only built when CONFIG_ZONE_DEVICE is set, so remove
> the superflous extra check.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>   mm/memremap.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/memremap.c b/mm/memremap.c
> index 6aa5f0c2d11fda..5f04a0709e436e 100644
> --- a/mm/memremap.c
> +++ b/mm/memremap.c
> @@ -328,8 +328,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
>   		}
>   		break;
>   	case MEMORY_DEVICE_FS_DAX:
> -		if (!IS_ENABLED(CONFIG_ZONE_DEVICE) ||
> -		    IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
> +		if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
>   			WARN(1, "File system DAX not supported\n");
>   			return ERR_PTR(-EINVAL);
>   		}
> 

Indeed it does have it in the makefile:-

root@dev mm (for-next) # grep memremap.o Makefile
obj-$(CONFIG_ZONE_DEVICE) += memremap.o


Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>