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From: Baoquan He <bhe@redhat.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: Rich Felker <dalias@libc.org>,
	linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Michal Hocko <mhocko@kernel.org>,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Max Filippov <jcmvbkbc@gmail.com>, Guo Ren <guoren@kernel.org>,
	linux-csky@vger.kernel.org, linux-parisc@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org,
	linux-riscv@lists.infradead.org,
	Greg Ungerer <gerg@linux-m68k.org>,
	linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-snps-arc@lists.infradead.org, linux-c6x-dev@linux-c6x.org,
	Brian Cain <bcain@codeaurora.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-sh@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
	Helge Deller <deller@gmx.de>,
	x86@kernel.org, Russell King <linux@armlinux.org.uk>,
	Ley Foon Tan <ley.foon.>
Subject: Re: [PATCH 01/21] mm: memblock: replace dereferences of memblock_region.nid with API calls
Date: Tue, 21 Apr 2020 10:06:03 +0800
Message-ID: <20200421020603.GO4247@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20200412194859.12663-2-rppt@kernel.org>

On 04/12/20 at 10:48pm, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> There are several places in the code that directly dereference
> memblock_region.nid despite this field being defined only when
> CONFIG_HAVE_MEMBLOCK_NODE_MAP=y.
> 
> Replace these with calls to memblock_get_region_nid() to improve code
> robustness and to avoid possible breakage when
> CONFIG_HAVE_MEMBLOCK_NODE_MAP will be removed.
> 
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>  arch/arm64/mm/numa.c | 9 ++++++---
>  arch/x86/mm/numa.c   | 6 ++++--
>  mm/memblock.c        | 8 +++++---
>  mm/page_alloc.c      | 4 ++--
>  4 files changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> index 4decf1659700..aafcee3e3f7e 100644
> --- a/arch/arm64/mm/numa.c
> +++ b/arch/arm64/mm/numa.c
> @@ -350,13 +350,16 @@ static int __init numa_register_nodes(void)
>  	struct memblock_region *mblk;
>  
>  	/* Check that valid nid is set to memblks */
> -	for_each_memblock(memory, mblk)
> -		if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
> +	for_each_memblock(memory, mblk) {
> +		int mblk_nid = memblock_get_region_node(mblk);
> +
> +		if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
>  			pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
> -				mblk->nid, mblk->base,
> +				mblk_nid, mblk->base,
>  				mblk->base + mblk->size - 1);
>  			return -EINVAL;
>  		}
> +	}
>  
>  	/* Finally register nodes. */
>  	for_each_node_mask(nid, numa_nodes_parsed) {
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 59ba008504dc..fe024b2ac796 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -517,8 +517,10 @@ static void __init numa_clear_kernel_node_hotplug(void)
>  	 *   reserve specific pages for Sandy Bridge graphics. ]
>  	 */
>  	for_each_memblock(reserved, mb_region) {
> -		if (mb_region->nid != MAX_NUMNODES)
> -			node_set(mb_region->nid, reserved_nodemask);
> +		int nid = memblock_get_region_node(mb_region);
> +
> +		if (nid != MAX_NUMNODES)
> +			node_set(nid, reserved_nodemask);
>  	}
>  
>  	/*
> diff --git a/mm/memblock.c b/mm/memblock.c
> index c79ba6f9920c..43e2fd3006c1 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1207,13 +1207,15 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
>  {
>  	struct memblock_type *type = &memblock.memory;
>  	struct memblock_region *r;
> +	int r_nid;
>  
>  	while (++*idx < type->cnt) {
>  		r = &type->regions[*idx];
> +		r_nid = memblock_get_region_node(r);
>  
>  		if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
>  			continue;
> -		if (nid == MAX_NUMNODES || nid == r->nid)
> +		if (nid == MAX_NUMNODES || nid == r_nid)
>  			break;
>  	}
>  	if (*idx >= type->cnt) {
> @@ -1226,7 +1228,7 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
>  	if (out_end_pfn)
>  		*out_end_pfn = PFN_DOWN(r->base + r->size);
>  	if (out_nid)
> -		*out_nid = r->nid;
> +		*out_nid = r_nid;
>  }
>  
>  /**
> @@ -1810,7 +1812,7 @@ int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
>  	*start_pfn = PFN_DOWN(type->regions[mid].base);
>  	*end_pfn = PFN_DOWN(type->regions[mid].base + type->regions[mid].size);
>  
> -	return type->regions[mid].nid;
> +	return memblock_get_region_node(&type->regions[mid]);
>  }
>  #endif
>  
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 69827d4fa052..0d012eda1694 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7208,7 +7208,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>  			if (!memblock_is_hotpluggable(r))
>  				continue;
>  
> -			nid = r->nid;
> +			nid = memblock_get_region_node(r);
>  
>  			usable_startpfn = PFN_DOWN(r->base);
>  			zone_movable_pfn[nid] = zone_movable_pfn[nid] ?
> @@ -7229,7 +7229,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>  			if (memblock_is_mirror(r))
>  				continue;
>  
> -			nid = r->nid;
> +			nid = memblock_get_region_node(r);
>  
>  			usable_startpfn = memblock_region_memory_base_pfn(r);

Looks good to me.

Reviewed-by: Baoquan He <bhe@redhat.com>

  reply index

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-12 19:48 [PATCH 00/21] mm: rework free_area_init*() funcitons Mike Rapoport
2020-04-12 19:48 ` [PATCH 01/21] mm: memblock: replace dereferences of memblock_region.nid with API calls Mike Rapoport
2020-04-21  2:06   ` Baoquan He [this message]
2020-04-12 19:48 ` [PATCH 02/21] mm: make early_pfn_to_nid() and related defintions close to each other Mike Rapoport
2020-04-21  2:24   ` Baoquan He
2020-04-21  8:49     ` Mike Rapoport
2020-04-21  8:49       ` Mike Rapoport
2020-04-21  9:33       ` Baoquan He
2020-04-21  3:31   ` Baoquan He
2020-04-21  8:39     ` Mike Rapoport
2020-04-21  8:39       ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 03/21] mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP option Mike Rapoport
2020-04-21  4:23   ` Baoquan He
2020-04-21  9:09     ` Mike Rapoport
2020-04-21  9:09       ` Mike Rapoport
2020-04-21  9:45       ` Baoquan He
2020-04-12 19:48 ` [PATCH 04/21] mm: free_area_init: use maximal zone PFNs rather than zone sizes Mike Rapoport
2020-04-22 23:41   ` Baoquan He
2020-06-15  3:53   ` Greg Ungerer
2020-06-15  6:22     ` Mike Rapoport
2020-06-15  6:22       ` Mike Rapoport
2020-06-15  7:17       ` Greg Ungerer
2020-04-12 19:48 ` [PATCH 05/21] mm: use free_area_init() instead of free_area_init_nodes() Mike Rapoport
2020-04-23  0:02   ` Baoquan He
2020-04-12 19:48 ` [PATCH 06/21] alpha: simplify detection of memory zone boundaries Mike Rapoport
2020-04-12 19:48 ` [PATCH 07/21] arm: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 08/21] arm64: simplify detection of memory zone boundaries for UMA configs Mike Rapoport
2020-04-12 19:48 ` [PATCH 09/21] csky: simplify detection of memory zone boundaries Mike Rapoport
2020-04-12 19:48 ` [PATCH 10/21] m68k: mm: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 11/21] parisc: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 12/21] sparc32: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 13/21] unicore32: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 14/21] xtensa: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 15/21] mm: memmap_init: iterate over memblock regions rather that check each PFN Mike Rapoport
2020-04-20 14:26   ` Qian Cai
2020-04-24  7:22   ` David Hildenbrand
2020-04-25 16:49     ` Mike Rapoport
2020-04-25 16:49       ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 16/21] mm: remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES Mike Rapoport
2020-04-23  1:13   ` Baoquan He
2020-04-23  5:50     ` Mike Rapoport
2020-04-23  5:50       ` Mike Rapoport
2020-05-18 21:38     ` Hoan Tran
2020-04-12 19:48 ` [PATCH 17/21] mm: free_area_init: allow defining max_zone_pfn in descending order Mike Rapoport
2020-04-23  2:53   ` Baoquan He
2020-04-23  2:57     ` Baoquan He
2020-04-23  5:55       ` Mike Rapoport
2020-04-23  5:55         ` Mike Rapoport
2020-04-24  0:33         ` Baoquan He
2020-04-12 19:48 ` [PATCH 18/21] mm: rename free_area_init_node() to free_area_init_memoryless_node() Mike Rapoport
2020-04-23  3:14   ` Baoquan He
2020-04-23  6:18     ` Mike Rapoport
2020-04-23  6:18       ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 19/21] mm: clean up free_area_init_node() and its helpers Mike Rapoport
2020-04-12 19:48 ` [PATCH 20/21] mm: simplify find_min_pfn_with_active_regions() Mike Rapoport
2020-04-12 19:48 ` [PATCH 21/21] docs/vm: update memory-models documentation Mike Rapoport

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