linux-kernel - Re: [PATCH v3 15/26] x86/numa_emu: use a helper function to get MAX_DMA32

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Message-ID: <492667ab-81ad-468c-a615-babc4aea4131@redhat.com>
Date: Tue, 6 Aug 2024 15:14:19 +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>, Davidlohr Bueso
 <dave@...olabs.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>,
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 <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
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Subject: Re: [PATCH v3 15/26] x86/numa_emu: use a helper function to get
 MAX_DMA32_PFN

On 01.08.24 08:08, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> This is required to make numa emulation code architecture independent so
> that it can be moved to generic code in following commits.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Tested-by: Zi Yan <ziy@...dia.com> # for x86_64 and arm64
> ---
>   arch/x86/include/asm/numa.h  | 1 +
>   arch/x86/mm/numa.c           | 5 +++++
>   arch/x86/mm/numa_emulation.c | 4 ++--
>   3 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
> index 7017d540894a..b22c85c1ef18 100644
> --- a/arch/x86/include/asm/numa.h
> +++ b/arch/x86/include/asm/numa.h
> @@ -74,6 +74,7 @@ void debug_cpumask_set_cpu(int cpu, int node, bool enable);
>   int numa_emu_cmdline(char *str);
>   void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
>   					unsigned int nr_emu_nids);
> +u64 __init numa_emu_dma_end(void);
>   #else /* CONFIG_NUMA_EMU */
>   static inline int numa_emu_cmdline(char *str)
>   {
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 9180d524cfe4..8b7c6580d268 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -868,6 +868,11 @@ void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
>   		__apicid_to_node[i] = j < nr_emu_nids ? j : 0;
>   	}
>   }
> +
> +u64 __init numa_emu_dma_end(void)
> +{
> +	return PFN_PHYS(MAX_DMA32_PFN);
> +}

Inline function in header?

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

-- 
Cheers,

David / dhildenb