linux-kernel - Re: [PATCH 9/9] mm: replace CONFIG_FLAT_NODE_MEM_MAP with CONFIG

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Message-ID: <5dc2c695-06c9-671f-a77d-24db56485041@redhat.com>
Date:   Wed, 9 Jun 2021 12:58:11 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Richard Henderson <rth@...ddle.net>,
        Vineet Gupta <vgupta@...opsys.com>, kexec@...ts.infradead.org,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH 9/9] mm: replace CONFIG_FLAT_NODE_MEM_MAP with
 CONFIG_FLATMEM

On 02.06.21 12:53, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> After removal of the DISCONTIGMEM memory model the FLAT_NODE_MEM_MAP
> configuration option is equivalent to FLATMEM.
> 
> Drop CONFIG_FLAT_NODE_MEM_MAP and use CONFIG_FLATMEM instead.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>   include/linux/mmzone.h | 4 ++--
>   kernel/crash_core.c    | 2 +-
>   mm/Kconfig             | 4 ----
>   mm/page_alloc.c        | 6 +++---
>   mm/page_ext.c          | 2 +-
>   5 files changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index ad42f440c704..2698cdbfbf75 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -775,7 +775,7 @@ typedef struct pglist_data {
>   	struct zonelist node_zonelists[MAX_ZONELISTS];
>   
>   	int nr_zones; /* number of populated zones in this node */
> -#ifdef CONFIG_FLAT_NODE_MEM_MAP	/* means !SPARSEMEM */
> +#ifdef CONFIG_FLATMEM	/* means !SPARSEMEM */
>   	struct page *node_mem_map;
>   #ifdef CONFIG_PAGE_EXTENSION
>   	struct page_ext *node_page_ext;
> @@ -865,7 +865,7 @@ typedef struct pglist_data {
>   
>   #define node_present_pages(nid)	(NODE_DATA(nid)->node_present_pages)
>   #define node_spanned_pages(nid)	(NODE_DATA(nid)->node_spanned_pages)
> -#ifdef CONFIG_FLAT_NODE_MEM_MAP
> +#ifdef CONFIG_FLATMEM
>   #define pgdat_page_nr(pgdat, pagenr)	((pgdat)->node_mem_map + (pagenr))
>   #else
>   #define pgdat_page_nr(pgdat, pagenr)	pfn_to_page((pgdat)->node_start_pfn + (pagenr))
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 53eb8bc6026d..2b8446ea7105 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -483,7 +483,7 @@ static int __init crash_save_vmcoreinfo_init(void)
>   	VMCOREINFO_OFFSET(page, compound_head);
>   	VMCOREINFO_OFFSET(pglist_data, node_zones);
>   	VMCOREINFO_OFFSET(pglist_data, nr_zones);
> -#ifdef CONFIG_FLAT_NODE_MEM_MAP
> +#ifdef CONFIG_FLATMEM
>   	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
>   #endif
>   	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
> diff --git a/mm/Kconfig b/mm/Kconfig
> index bffe4bd859f3..ded98fb859ab 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -55,10 +55,6 @@ config FLATMEM
>   	def_bool y
>   	depends on !SPARSEMEM || FLATMEM_MANUAL
>   
> -config FLAT_NODE_MEM_MAP
> -	def_bool y
> -	depends on !SPARSEMEM
> -
>   #
>   # SPARSEMEM_EXTREME (which is the default) does some bootmem
>   # allocations when sparse_init() is called.  If this cannot
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 8f08135d3eb4..f039736541eb 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6444,7 +6444,7 @@ static void __meminit zone_init_free_lists(struct zone *zone)
>   	}
>   }
>   
> -#if !defined(CONFIG_FLAT_NODE_MEM_MAP)
> +#if !defined(CONFIG_FLATMEM)
>   /*
>    * Only struct pages that correspond to ranges defined by memblock.memory
>    * are zeroed and initialized by going through __init_single_page() during
> @@ -7241,7 +7241,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
>   	}
>   }
>   
> -#ifdef CONFIG_FLAT_NODE_MEM_MAP
> +#ifdef CONFIG_FLATMEM
>   static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
>   {
>   	unsigned long __maybe_unused start = 0;
> @@ -7289,7 +7289,7 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
>   }
>   #else
>   static void __ref alloc_node_mem_map(struct pglist_data *pgdat) { }
> -#endif /* CONFIG_FLAT_NODE_MEM_MAP */
> +#endif /* CONFIG_FLATMEM */
>   
>   #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
>   static inline void pgdat_set_deferred_range(pg_data_t *pgdat)
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index df6f74aac8e1..293b2685fc48 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -191,7 +191,7 @@ void __init page_ext_init_flatmem(void)
>   	panic("Out of memory");
>   }
>   
> -#else /* CONFIG_FLAT_NODE_MEM_MAP */
> +#else /* CONFIG_FLATMEM */
>   
>   struct page_ext *lookup_page_ext(const struct page *page)
>   {
> 

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

-- 
Thanks,

David / dhildenb