linux-kernel - Re: [PATCH 02/17] MIPS: sgi-ip27: make NODE_DATA() the same as on all other architectures

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Message-ID: <e57eca18-b66d-4b5d-9e73-8ab22f6bc747@redhat.com>
Date: Wed, 17 Jul 2024 16:32:59 +0200
From: David Hildenbrand <david@...hat.com>
To: Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andreas Larsson <andreas@...sler.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
 Borislav Petkov <bp@...en8.de>, Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Dan Williams <dan.j.williams@...el.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Heiko Carstens <hca@...ux.ibm.com>, Huacai Chen <chenhuacai@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Jiaxun Yang <jiaxun.yang@...goat.com>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Michael Ellerman <mpe@...erman.id.au>, Palmer Dabbelt <palmer@...belt.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Thomas Gleixner <tglx@...utronix.de>, Vasily Gorbik <gor@...ux.ibm.com>,
 Will Deacon <will@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
 sparclinux@...r.kernel.org, linux-acpi@...r.kernel.org,
 linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
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 x86@...nel.org
Subject: Re: [PATCH 02/17] MIPS: sgi-ip27: make NODE_DATA() the same as on all
 other architectures

On 16.07.24 13:13, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> sgi-ip27 is the only system that defines NODE_DATA() differently than
> the rest of NUMA machines.
> 
> Add node_data array of struct pglist pointers that will point to
> __node_data[node]->pglist and redefine NODE_DATA() to use node_data
> array.
> 
> This will allow pulling declaration of node_data to the generic mm code
> in the next commit.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> ---
>   arch/mips/include/asm/mach-ip27/mmzone.h | 5 ++++-
>   arch/mips/sgi-ip27/ip27-memory.c         | 5 ++++-
>   2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
> index 08c36e50a860..629c3f290203 100644
> --- a/arch/mips/include/asm/mach-ip27/mmzone.h
> +++ b/arch/mips/include/asm/mach-ip27/mmzone.h
> @@ -22,7 +22,10 @@ struct node_data {
>   
>   extern struct node_data *__node_data[];
>   
> -#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
>   #define hub_data(n)		(&__node_data[(n)]->hub)
>   
> +extern struct pglist_data *node_data[];
> +
> +#define NODE_DATA(nid)		(node_data[nid])
> +
>   #endif /* _ASM_MACH_MMZONE_H */
> diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
> index b8ca94cfb4fe..c30ef6958b97 100644
> --- a/arch/mips/sgi-ip27/ip27-memory.c
> +++ b/arch/mips/sgi-ip27/ip27-memory.c
> @@ -34,8 +34,10 @@
>   #define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
>   #define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
>   
> -struct node_data *__node_data[MAX_NUMNODES];
> +struct pglist_data *node_data[MAX_NUMNODES];
> +EXPORT_SYMBOL(node_data);
>   
> +struct node_data *__node_data[MAX_NUMNODES];
>   EXPORT_SYMBOL(__node_data);
>   
>   static u64 gen_region_mask(void)
> @@ -361,6 +363,7 @@ static void __init node_mem_init(nasid_t node)
>   	 */
>   	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
>   	memset(__node_data[node], 0, PAGE_SIZE);
> +	node_data[node] = &__node_data[node]->pglist;
>   
>   	NODE_DATA(node)->node_start_pfn = start_pfn;
>   	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;

I was assuming we could get rid of __node_data->pglist.

But now I am confused where that is actually set.

Anyhow

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

-- 
Cheers,

David / dhildenb