Commit 6626734d authored by Robin Murphy's avatar Robin Murphy Committed by Marek Szyprowski
Browse files

mm_zone: Generalise has_managed_dma() 



It would be useful to be able to check for potential DMA pages beyond
just ZONE_DMA - generalise the existing has_managed_dma() function to
allow checking other zones too.

Signed-off-by: default avatarRobin Murphy <robin.murphy@arm.com>
Acked-by: default avatarDavid Hildenbrand (Red Hat) <david@kernel.org>
Acked-by: default avatarMike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: default avatarVladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Reviewed-by: default avatarBaoquan He <bhe@redhat.com>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/bd002d2351074e57be1ca08f03f333debac658fb.1768230104.git.robin.murphy@arm.com
parent b31ac41b

include/linux/mmzone.h

+5 −4
Original line number Diff line number Diff line
@@ -1648,14 +1648,15 @@ static inline int is_highmem(const struct zone *zone) 
	return is_highmem_idx(zone_idx(zone));

}



#ifdef CONFIG_ZONE_DMA

bool has_managed_dma(void);

#else

bool has_managed_zone(enum zone_type zone);

static inline bool has_managed_dma(void)

{

#ifdef CONFIG_ZONE_DMA

	return has_managed_zone(ZONE_DMA);

#else

	return false;

}

#endif

}





#ifndef CONFIG_NUMA

mm/page_alloc.c

+2 −6
Original line number Diff line number Diff line
@@ -7418,20 +7418,16 @@ bool put_page_back_buddy(struct page *page) 
}

#endif



#ifdef CONFIG_ZONE_DMA

bool has_managed_dma(void)

bool has_managed_zone(enum zone_type zone)

{

	struct pglist_data *pgdat;



	for_each_online_pgdat(pgdat) {

		struct zone *zone = &pgdat->node_zones[ZONE_DMA];



		if (managed_zone(zone))

		if (managed_zone(&pgdat->node_zones[zone]))

			return true;

	}

	return false;

}

#endif /* CONFIG_ZONE_DMA */



#ifdef CONFIG_UNACCEPTED_MEMORY