linux-kernel - Re: [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT and SLIT

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Message-ID: <3ac8ffb3-f447-45ef-c118-dde4efe74911@linaro.org>
Date:	Tue, 16 Aug 2016 19:58:09 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	David Daney <ddaney.cavm@...il.com>
Cc:	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	linux-ia64@...r.kernel.org, linux-acpi@...r.kernel.org,
	devel@...ica.org, Robert Richter <rrichter@...ium.com>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT
 and SLIT

On 2016/8/15 23:35, Catalin Marinas wrote:
> On Tue, May 24, 2016 at 03:35:44PM -0700, David Daney wrote:
>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
>> index aee323b..4b13ecd 100644
>> --- a/arch/arm64/include/asm/acpi.h
>> +++ b/arch/arm64/include/asm/acpi.h
>> @@ -113,4 +113,12 @@ static inline const char *acpi_get_enable_method(int cpu)
>>  pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
>>  #endif
>>
>> +#ifdef CONFIG_ACPI_NUMA
>> +int arm64_acpi_numa_init(void);
>> +int acpi_numa_get_nid(unsigned int cpu, u64 hwid);
>> +#else
>> +static inline int arm64_acpi_numa_init(void) { return -ENOSYS; }
>> +static inline int acpi_numa_get_nid(unsigned int cpu, u64 hwid) { return NUMA_NO_NODE; }
>> +#endif /* CONFIG_ACPI_NUMA */
>> +
>>  #endif /*_ASM_ACPI_H*/
>
> Apparently this doesn't always build since asm/acpi.h is conditionally
> included from linux/acpi.h only when CONFIG_ACPI is enabled. Disabling
> this option on arm64 leads to:
>
> arch/arm64/mm/numa.c: In function ‘arm64_numa_init’:
> arch/arm64/mm/numa.c:395:24: error: ‘arm64_acpi_numa_init’ undeclared (first use in this function)
>    if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
>
> I'll fix it in arch/arm64 by including asm/acpi.h directly as we do in a
> couple of other files:
>
> ------------------8<------------------------------
> From 9a83bf400e0b4ef066b83eeaecdbca909b8491ea Mon Sep 17 00:00:00 2001
> From: Catalin Marinas <catalin.marinas@....com>
> Date: Mon, 15 Aug 2016 16:33:10 +0100
> Subject: [PATCH] arm64: Fix NUMA build error when !CONFIG_ACPI
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Since asm/acpi.h is only included by linux/acpi.h when CONFIG_ACPI is
> enabled, disabling the latter leads to the following build error on
> arm64:
>
> arch/arm64/mm/numa.c: In function ‘arm64_numa_init’:
> arch/arm64/mm/numa.c:395:24: error: ‘arm64_acpi_numa_init’ undeclared (first use in this function)
>    if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
>
> This patch include the asm/acpi.h explicitly in arch/arm64/mm/numa.c for
> the arm64_acpi_numa_init() definition.
>
> Fixes: d8b47fca8c23 ("arm64, ACPI, NUMA: NUMA support based on SRAT and SLIT")
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  arch/arm64/mm/numa.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> index c7fe3ec70774..5bb15eab6f00 100644
> --- a/arch/arm64/mm/numa.c
> +++ b/arch/arm64/mm/numa.c
> @@ -23,6 +23,8 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>
> +#include <asm/acpi.h>
> +
>  struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
>  EXPORT_SYMBOL(node_data);
>  nodemask_t numa_nodes_parsed __initdata;


Thanks a lot!

Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>

Hanjun