linux-kernel - Re: [PATCH 1/7] apei, mce: Call MCE-specific code only for X86 architecture.

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Date:	Mon, 5 May 2014 13:44:45 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Cc:	rjw@...ysocki.net, lenb@...nel.org, tony.luck@...el.com,
	bp@...e.de, m.chehab@...sung.com, linux-edac@...r.kernel.org,
	x86@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH 1/7] apei, mce: Call MCE-specific code only for X86
 architecture.

On Wed, Apr 09, 2014 at 05:14:29PM +0200, Tomasz Nowicki wrote:
> This commit is dealing with MCE code in:
> - hest.c
> Move acpi_disable_cmcff flag to hest_parse_cmc() and makes
> that depend on CONFIG_X86_MCE so that we do not have to maintain
> acpi_disable_cmcff for architectures which do not support MCE.
> Also, wrap architectural MCE header inside #ifdef CONFIG_X86_MCE.
> 
> - ghes.c
> Wrap architectural MCE header inside #ifdef CONFIG_X86_MCE similar to rest
> of the MCE code in this file.
> 
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> ---
>  drivers/acpi/apei/ghes.c |    2 ++
>  drivers/acpi/apei/hest.c |    8 ++++++--
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index dab7cb7..f7edffc 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -49,7 +49,9 @@
>  #include <linux/aer.h>
>  
>  #include <acpi/ghes.h>
> +#ifdef CONFIG_X86_MCE
>  #include <asm/mce.h>
> +#endif
>  #include <asm/tlbflush.h>
>  #include <asm/nmi.h>
>  
> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> index f5e37f3..98db702 100644
> --- a/drivers/acpi/apei/hest.c
> +++ b/drivers/acpi/apei/hest.c
> @@ -36,7 +36,9 @@
>  #include <linux/io.h>
>  #include <linux/platform_device.h>
>  #include <acpi/apei.h>
> +#ifdef CONFIG_X86_MCE
>  #include <asm/mce.h>
> +#endif

Actually, I would prefer if you wrapped all the arch-specific calls into
arch-specific functions, say, convert

apei_mce_report_mem_error -> apei_arch_report_mem_error

and have default empty functions for arches which don't use that
functionality.

This way you can save yourself the ugly ifdeffery around the place.

>  
>  #include "apei-internal.h"
>  
> @@ -133,6 +135,9 @@ static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
>  	struct acpi_hest_ia_corrected *cmc;
>  	struct acpi_hest_ia_error_bank *mc_bank;
>  
> +	if (acpi_disable_cmcff)
> +		return 1;

This could be

	if (arch_disable_cmcff())
		return 1;

with the default stub being

static inline bool arch_disable_cmcff(void)
{
	return false;
}

and so on, like it is done in many other places in the kernel.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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