linux-kernel - Re: [PATCH v6 07/12] mm: Kill is_dev

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Message-ID: <f189190c-4d70-be54-e194-fb736505f38e@redhat.com>
Date:   Wed, 17 Apr 2019 22:17:44 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org
Cc:     Michal Hocko <mhocko@...e.com>,
        Logan Gunthorpe <logang@...tatee.com>, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 07/12] mm: Kill is_dev_zone() helper

On 17.04.19 20:39, Dan Williams wrote:
> Given there are no more usages of is_dev_zone() outside of 'ifdef
> CONFIG_ZONE_DEVICE' protection, kill off the compilation helper.
> 
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  include/linux/mmzone.h |   12 ------------
>  mm/page_alloc.c        |    2 +-
>  2 files changed, 1 insertion(+), 13 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index b13f0cddf75e..3237c5e456df 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -855,18 +855,6 @@ static inline int local_memory_node(int node_id) { return node_id; };
>   */
>  #define zone_idx(zone)		((zone) - (zone)->zone_pgdat->node_zones)
>  
> -#ifdef CONFIG_ZONE_DEVICE
> -static inline bool is_dev_zone(const struct zone *zone)
> -{
> -	return zone_idx(zone) == ZONE_DEVICE;
> -}
> -#else
> -static inline bool is_dev_zone(const struct zone *zone)
> -{
> -	return false;
> -}
> -#endif
> -
>  /*
>   * Returns true if a zone has pages managed by the buddy allocator.
>   * All the reclaim decisions have to use this function rather than
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index c9ad28a78018..fd455bd742d5 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5844,7 +5844,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
>  	unsigned long start = jiffies;
>  	int nid = pgdat->node_id;
>  
> -	if (WARN_ON_ONCE(!pgmap || !is_dev_zone(zone)))
> +	if (WARN_ON_ONCE(!pgmap || zone_idx(zone) != ZONE_DEVICE))
>  		return;
>  
>  	/*
> 

I like seeing that go

Acked-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David / dhildenb